]> Avilution

Huntsville AL US markster@avilution.com

EMC Software

Jersey City NJ US edguy@eguy.org

General Internet Engineering Task Force avionics This document presents a binary IP-based protocol to facilitate interoperable communications between avionics equipment. The protocol is UDP-based, stateless, and broadcast. Messages consist of a common header followed by a series of parameters and related attributes. The parameters are always informational, e.g., indicating airspeed is 150 kts, but parameter attributes can be set to indicate intent, e.g., this parameter contains a new user selected value such as an instruction that deploys the landing gear.

Introduction Historically, avionics equipment has used private protocols for device interconnection but the trend is towards open communication leveraging standard hardware. There have been various stages in the evolution of device interconnection from point-to-point analog communication to digital serial protocols, to bus-based solutions and currently IP-based over ethernet. One of the concerns with all of these protocols in this industry is that extensive testing is required, so developing a common protocol and library with its extensive test cases will improve time to market, product quality, and hence lower cost and improved safety. The eXtensible Stateless Equipment Data Exchange, XSEDE, is such an IP-based protocol which provides a common means that facilitates parameter communication between airborne equipment. It is an open protocol which operates using binary-encoded UDP packets sent on a broadcast interface, typically using multicast Ethernet. This approach allows the avionics system to function as a collection of safety-critical microservices with XSEDE at the hub of the entire avionics system. XSEDE can flexibly drive multiple displays and unify all the aircraft's subsystems all at the control of the system integrator. Parameters generally fall into two separate categories: schedule-driven and event-driven. Schedule-driven parameters are those that are sent periodically by the nodes in the system. One example could be the current heading might be reported by a sensors at 10hz. These parameters have a logical expiration time associated with how long they are valid, for example, 250ms. Another example could be the current air temperature or even the current value of the pilot’s desired heading (heading bug.) Event driven parameters are those that occur in response to an external stimuli, e.g., a pilot action on a switch, or an autopilot deciding to change the heading due to reaching an intermediate waypoint. These parameters do not have a logical expiration time associated with how long they are valid.

Basic Properties XSEDE is a simple and compact protocol which uses a fast marshaling approach. Parameters may be coalesced, size and time permitting, into a single message to make transport more efficient. The message layout considers quad word alignment issues which can affect performance, especially on ARM-based architectures and pads to maintain efficiency. All messages are broadcast to all receivers so that the protocol is stateless and only the recipient controls whether a parameter will be processed. Since avionics software is subject to intensive testing and validation, XSEDE is designed to be deterministic with the fewest number of formal requirements required for implementation while still permitting the addition of new data formats and parameters through an extensible data model. Such additions can be made either through a future version of the standard or just through localized additionally configured data elements. User and System selected events can exhibit two distinct behaviors: an event that cause an immediate change, e.g., a radio frequency change, and those changes in which a change may take time to be reflected by the system, e.g., selecting a new flap position. In the former case, only one parameter is defined: a request would set the confidence field to USERSEL (or SYSSEL). At the same time, the radio would periodically report with the current setting. In the latter case, these settings are implemented with a pair of parameters, a request (REQ suffix) and a current state Parameter that has no specific suffix. For example, FLAPREQ and FLAPPOS (See ) where the first indicates the requested value and the second indicates the actual value.

Drawbacks XSEDE is a UDP-based protocol so packet delivery is not guaranteed. However, since XSEDE is typically run on a purpose built network within a specific aircraft, the reliability of the network is still typically very high. Application-level behavior is implemented to ensure critical requests are executed. Since the protocol is stateless, it relies on the requestor to monitor status to ensure an action was taken. For example, if a request to put the landing gear down is made, the requesting application must watch reports of the landing gear position and alert if the request is not satisfied in a timely manner. However, you would be able to see if your request was correctly interpreted by a report, periodic or in response to the event, by the responsible nodes. Notably, the protocol does not contain the concept of incrementing or decrementing a value, just setting a specific value. A user interface which is designed to increment and decrement a value based on a user turning a knob, for example, must track the current value and when an increment is detected, transmit the new, incremented value with the appropriate confidence (most likely USERSEL). If two or more applications are monitoring the same knob from two different computers, they each would be able to redundantly send the same new value without affecting the behavior whether one, two or more such applications were concurrently running.

Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

Message:

is the basic unit of communication in XSEDE.

Node:

is a device or process that implements XSEDE.

Parameter:

is the task specific payload contained in a message.

Attribute Format:

are the simple and structured data types associated with a parameter attribute.

Attributes:

are the values associated with a parameter.

Dictionary:

is a set of allowed values associated with an attribute, parameter, or message field.

Source ID:

Refers to the unique number which identifies the node, by convention with the top octet representing the computer and the bottom octet representing the application number within that computer.

Overview of XSEDE Protocol The eXtensible Stateless Equipment Data Exchange is designed to operate on an airborne platform network. This network is intended to be isolated from the general Internet and comprises instruments, displays, sensors, and actuators performing various functions. XSEDE messages are broadcast to every node on the network. XSEDE message occur in three classes: Maintenance, Operational and Raw. Maintenance and Operational messages consist of a header followed by a series of parameters. Parameters always represent information, a message is purely a collection of parameters. However, the confidence field must be interpreted to determine intent, i.e., the SYSSEL and USERSEL confidence levels MUST be interpreted by responsible nodes to affect changes on the relevant items. XSEDE is stateless. There is no required protocol level response to any command, however, informational responses may be made. For instance, a command to change the radio frequency of a certain radio may generate a application-level response indicating the new radio frequency. All XSEDE messages go to all nodes which simply discard things they don't care about. Raw XSEDE messages consist of a message header which specifies the length of the raw data, followed by that raw data. Raw data is classified as MIL-STD-1553, CANbus, digital samples, or other serial or streaming unframed data. Each node in XSEDE is assigned a source ID. These Source IDs MUST be unique within the XSEDE network. The Source ID and the message number uniquely identify the message and are contained in the message header. Message IDs created by a node MUST be monotonically increasing. A receiving node MUST ignore all duplicate messages. The Source ID and a message number are used to ensure messages are processed in order and only once. Messages MUST be processed in order skipping any missing messages and MUST only be processed once. Senders and Receivers must account for integer overflow in message numbers. There is no retry mechanism at the protocol level; Missing and out-of-order messages SHALL be considered lost and if received out of order, a message MUST be ignored. In addition to the Source ID and Message Number, The XSEDE message header also contains the message class, the Message Operation ID, DO-178 certification level, the confidence level and the payload length. For best performance, an XSEDE goal is to not send IP datagrams that have to be fragmented. Packets which exceed the MSS size will be fragmented. To achieve this goal XSEDE messages SHOULD be less than the network Maximum Segment Size (MSS) size in length. On a modern Ethernet network, IEEE 802.3 specifies a maximum payload size of 1500 bytes. The size of the fixed IPv4 header is 20 bytes or in IPv6 the fixed header is 40 bytes UDP headers consume 8 bytes, the XSEDE header uses 12 bytes leaving 1460 bytes for parameters or 1440 bytes on an IPv6 network.

Message Format

Message Header

Message Header Format

XSEDE messages are formatted as shown in the above diagram and consist of the following fields:

src id:

UINT16; locally configured source ID. Must be unique on network.

message number:

UINT16; monotonically increasing message number.

msg class:

UINT8; The message class. See

message ID:

UINT8; msg-op; See .

flags:

UINT16; See .

tcid:

t-NONE; See .

len:

UINT16 ; length of all parameters or raw data in bytes. Note: Operational and Maintenance class messages shall always have a length that is a factor or 4.

data:

1*(parameter) / *(OCTET) ; raw data may be arbitrary length sequence of octets.

Message Header Dictionaries This section defines the dictionaries used in the message header. See . , below, shows the values defined in the msg-class Dictionary. These values identify the message class: raw, maintenance or operational. msg-class Dictionary

Name	Value	Definition
MAINT	%d2	Maintenance Message
OP	%d3	Operational Message
RAW	%d4	Access to raw data stream (e.g., RS-232, RS-485, ARINC-429, etc)

, below, shows the values defined in the msg-op Dictionary. These options further refine the operational message class. msg-op Dictionary

Name	Value	Definition
FLIGHTDATA	%d2	Flight Data Info
DEVSTATUS	%d3	Device Status
GDL90	%d4	GDL-90 Format Messages without framing, FCS or escape characters.

, below, shows the values defined in the msg-flag-cert Dictionary. These choices represent the message and parameter certification level tracking with respect to the specification. The message value represents the certification value of the transmitter, where the parameter value represents the source data node's certification value. msg-flag-cert Dictionary

Name	Value	Definition
EXPERIMENTAL	%d0	Experimental
LEVEL-E	%d1	DO-178 Level E
LEVEL-D	%d2	DO-178 Level D
LEVEL-C	%d3	DO-178 Level C
LEVEL-B	%d4	DO-178 Level B
LEVEL-A	%d5	DO-178 Level A

, below, shows the values defined in the tcid Dictionary. XSEDE transcoder ID values or NONE if no transcoder. tcid Dictionary

Name	Value	Definition
NONE	%d0	No transcoder ID is required or asserted

Message Parameter Format The section defines the elements common to all XSEDE parameters.

Message Parameter Format

Unit:

UINT16 If appropriate, which unit this parameter applies (e.g., Engine #1).

SubUnit:

UINT16; If appropriate, which subunit this parameter applies (e.g., Engine #2, Cylinder #3).

Parameter Ident:

UINT32; This attribute is the composite of the length and a parameter specific identifier. Nodes MUST compare to their known parameters to this value as a whole; that it to say, an Ident with a different length is a different parameter. This same Ident with a different length situation commonly occurs when sending range parameters but it also can happen when parameter definitions are updated. If the combined value does not match a known parameter/length pair, the parameter data length MUST be determined, then padded to a multiple of four, and the parameter MUST be ignored.

Len:

11 bits; Parameter Data Length in octets. This value MUST reflect the usable length of the parameter data, not including padding, however, the parameter itself MUST be padded to a length that is a multiple of four bytes to maintain proper word alignment.

Ident:

21 bits; XSEDE Parameter Identifier. See .

Format:

param_format (OCTET): Format of Parameter Data. See .

Confidence:

param_confidence (OCTET): Confidence of data element. See .

Expire:

OCTET; Time to live. %xFF to not expire. See for encoding.

Pflags:

msg_flag_cert(OCTET) Reserved Flags, bottom three bits are certification level of data. See

Parameter Data:

*(OCTET) quadword padded payload.

Parameter Header Dictionaries , below, shows the values defined in the param-confidence Dictionary. These options represent parameter format confidence levels. param-confidence Dictionary

Name	Value	Definition
USERSEL	%d192	User selected value at runtime. Note: expire value SHOULD be zero and MUST be ignored by receivers.
SYSSEL	%d224	System selected value at runtime. Note: expire value SHOULD be zero and MUST be ignored by receivers.
HIGH	%d100	Confirmed known value
UNANIMOUS	%d50	Redundant data available and is rationalized
RATIONAL	%d40	Data being rationalized from other data sources with normal sources ignored
VOTED	%d30	Data is redundantly verified from identical instruments
SMOOTHED	%d20	Smoothed/filtered version of raw data
RAW / REPORTED	%d10	Raw or reported unchecked data
ESTIMATE	%d5	Rough estimation
USELESS	%d0	Value is missing or expected invalid and supplied for debugging ONLY

The msg_flag_cert Dictionary is also used. See for its definition.

Expire Encoding Information provided in messages have a limited usability lifetime or time-to-live. The Expire field is used to indicate how long the associated parameter is valid. It is an eight-bit field that is split into an exponent and mantissa to provide the maximum range and precision within this small space. The upper four bits represent the the mantissa and the lower four bits represent the exponent. If the value of the Expire field is %x00, the value MUST be interpreted to mean "the parameter does not expire," otherwise the expiry time value MUST be determined by the following formula: Expiration (milliseconds) = (16 + M) * 2^E which can be implemented with ( 0x10 | M ) << E This approach give us the range of 17 to 1015880 milliseconds (about 17 minutes) with 0x00 reserved as "No Expiration."

Message Parameter Format

For example, an expiry value of %x13 gives a mantissa of 0001 and an exponent of 0011 yielding a value of (16 + 1) * 2^E ms or 128 milliseconds. Another example, a value of %xF7 which decomposes to a mantissa of 1111 and an exponent of 0111 yielding a value of (16 + 15) * 2^7 ms, or 3968 milliseconds. The minimum value of %x01 which decomposes to a mantissa of 0001 and an exponent of 0000 yielding a value of (16 + 1) * 2^0 ms, or 17 milliseconds. The maximum value of %xFF which decomposes to a mantissa of 1111 and an exponent of 1111 yielding a value of (16 + 15) * 2^15 ms, or 1015808 milliseconds, which is about 17 minutes. A final example, %x00 which is a special case for "No Expiration."

Parameter Attribute Formats The various attributes associated with parameters occur as both simple types, such as Integers and compound structures, such as Waypoints. This section defines the attribute formats that are used in XSEDE.

BOOL Parameter Format Boolean Format Parameter Identifier: %d1 Length: 4 Structure: BOOL Parameter Format

Item	Type	Description
bool-value	boolean	Zero for false, 1 for true, all others undefined

, below, shows the values defined in the boolean Dictionary. These options represent the nominal boolean values. boolean Dictionary

Name	Value	Definition
FALSE	%d0	False
TRUE	%d1	True

UINT Parameter Format Unsigned 32-bit Integer Format Parameter Identifier: %d2 Length: 4 Structure: UINT Parameter Format

Item	Type	Description
uint-value	uint32	32-bit Unsigned Value

WAYPOINT Parameter Format Waypoint on a Flight Plan Parameter Identifier: %d3 Length: 80 Structure: WAYPOINT Parameter Format

Item	Type	Description
label	12*12(OCTET)	Name of waypoint
lat	int32	Latitude of waypoint * 10,000,000
lon	int32	Longitude of waypoint * 10,000,000
lonlen	int32	Length of degree of longitude for this latitude in meters
alt	int32	Altitude associated with waypoint in 0.1ft
minalt	int32	Logical Minimum for Fix Crossing in 0.1ft
maxalt	int32	Logical Maximum Altitude for Fix Crossing in 0.1ft
speed	int32	Target indicated airspeed
magadj	uint32	Original (VOR) or Current (GPS) Magnetic Deviation in 0.01 degrees of NAVAID
inbound	uint16	Inbound course in 0.01 degrees
outbound	uint16	Outbound course in 0.01 degrees
freqkhz	uint32	Frequency in khz if this is a NAV AID
wtype	fms-waypoint	Type of waypoint
ctype	fms-container	Type of container
flags	fms-flag	Flags for the waypoint / leg
cumete	uint32	Cumulative ETE from active waypoint in 0.01 seconds
cumdis	uint32	Cumulative distance from active waypoint in 0.001 nm
container	16*16(OCTET)	What container is this waypoint a part of (e.g., V431, ILS-18L, etc)

, below, shows the values defined in the fms-waypoint Dictionary. These options represent the flight management system waypoint types. fms-waypoint Dictionary

Name	Value	Definition
UNKNOWN	%d0	Unknown or unspecified
GS	%x80	Glideslope component
DME	%x40	DME Component
TACAN	%x20	TACAN Component
VOR	%d1	VOR Component
LOC	%d2	Localizer component
NDB	%d3	NDB component
LDA	%d4	LDA Component
SDF	%d5	SDF Component
FIX	%d6	Generic RNAV Fix
ILS	%d7	Complete ILS system
AIRPORT	%d8	An Airport
DIRECTFROM	%d9	Starting point of a direct to
WEATHER	%d10	Weather reporting station only

, below, shows the values defined in the fms-container Dictionary. These options represent the flight management system container types. fms-container Dictionary

Name	Value	Definition
UNKNOWN	%d0	Unspecified or unknown container
NONE	%d1	No container
VICTOR	%d2	VOR Airway
JET	%d3	Jet Airway
AMBER	%d4	Amber Airway
BLUE	%d5	Blue Airway
GREEN	%d6	Green Airway
RED	%d7	Red Airway
Q	%d8	RNAV Q Routes
T	%d9	RNAV T Routes
STAR	%d10	Standard Arrival Procedure
DP	%d11	Standard Departure Procedure
APP	%d12	Instrument Approach

, below, shows the values defined in the fms-flag Dictionary. These options represent the flight management system waypoint and leg flags. fms-flag Dictionary

Name	Value	Definition
NONE	%d0	No flags or leg type known
LEGTYPE-VA	%d1	Heading to Altitude
LEGTYPE-VD	%d2	Heading to DME Distance
LEGTYPE-VI	%d3	Heading to Next Leg Intercept
LEGTYPE-VM	%d4	Heading to Manual Termination
LEGTYPE-VR	%d5	Heading to Radial Termination
LEGTYPE-CA	%d6	Course to an Altitude
LEGTYPE-CD	%d7	Course to a DME Distance
LEGTYPE-CI	%d8	Course to Next Leg Intercept
LEGTYPE-CR	%d9	Course to Radial Termination
LEGTYPE-CF	%d10	Course to a Fix
LEGTYPE-TF	%d11	Tracking Between Two Fixes
LEGTYPE-DF	%d12	Direct to a Fix
LEGTYPE-FA	%d13	Course from a Fix to an Altitude
LEGTYPE-FC	%d14	Course from a Fix to an Along Track Distance
LEGTYPE-FD	%d15	Course from a Fix to a DME Distance
LEGTYPE-FM	%d16	Course from a Fix to a Manual Termination
LEGTYPE-AF	%d17	Constant DMA Arc to a Fix
LEGTYPE-HF	%d18	Hold to a Fix
LEGTYPE-HA	%d19	Hold to an Altitude
LEGTYPE-HM	%d20	Hold to a Manual Termination
LEGTYPE-IF	%d21	Initial Fix
LEGTYPE-PI	%d22	Procedure Turn to Intercept
LEGTYPE-RF	%d23	Radius to a Fix
FLYOVER	%x01.00	If not present, fly by
DISC	%x02.00	If present, Discontinuity before current waypoint
ACTIVE	%x04.00	If present, this is the active waypoint
OBS	%x08.00	If present, waypoint allows OBS to be set
FAF	%x10.00	If present, waypoint is final approach fix or after
SUSPEND	%x20.00	FMS sequencing is suspended at this waypoint
LAST	%x40.00	This waypoint is the last one in the flight plan

STRING Parameter Format String of characters (may not have NULL termination) Parameter Identifier: %d4 Length: length(data) + 0 Structure: STRING Parameter Format

Item	Type	Description
string-value	*(OCTET)	Optionally NUL terminated String

CASMSG Parameter Format CAS Message Parameter Identifier: %d5 Length: length(data) + 4 Structure: CASMSG Parameter Format

Item	Type	Description
level	cas-msglvl	CAS level
rsvd	uint8	Reserved, set to 0
flags	cas-msgflag	CAS related flags
label	*(OCTET)	Label for CAS Message

, below, shows the values defined in the cas-msglvl Dictionary. These options represent the Message levels for CAS messages and checklist items. cas-msglvl Dictionary

Name	Value	Definition
CLEAR	%d0	Clear a previously issued CAS message -- issue from system only
DEBUG	%d1	In-system debugging output only
LOG	%d2	Log to system log, but do not display
MAINT	%d3	Display only for maintenance purposes
STATUS	%d4	Aircraft system status only
ADVISORY	%d5	Advisory, flight crew should be aware, may require later crew response
CAUTION	%d6	Caution, requires immediate flight crew awareness and later response
WARNING	%d7	Warning, requires immediate awareness and response.
COMMENT	%d10	Checklist Comment Associated with Previous Item
UNCHKITEM	%d11	Unchecked Checklist Item
CHKITEM	%d12	Checked Checklist Item
CHKBRANCH	%d13	Checklist Branch Choice

, below, shows the values defined in the cas-msgflag Dictionary. These options represent the Additional flags associated with CAS messages. cas-msgflag Dictionary

Name	Value	Definition
AUTO	%x01	Item is automatically checked/unchecked

SINT Parameter Format Signed 32-bit Integer Format Parameter Identifier: %d9 Length: 4 Structure: SINT Parameter Format

Item	Type	Description
sint-value	int32	Signed 32-bit two's complement value

BUS Parameter Format Bus and Electronic Circuit Breaker Format Parameter Identifier: %d10 Length: length(data) + 24 Structure: BUS Parameter Format

Item	Type	Description
state	ecb-state	State of Bus (in terms of ECB)
ecbflags	ecb-flag	Flags regarding ECB state
involts	int16	Input Volts on Bus
drawamps	int16	Current draw on bus
maxamps	int16	Max Amps on bus
champs	int16	Caution high amps
clamps	int16	Caution low amps
minamps	int16	Minimum amps on bus (could be -)
outvolts	int16	Output Volts on Bus
maxvolts	int16	Max volts
chvolts	int16	Caution high voltage
clvolts	int16	Caution low voltage
minvolts	int16	Minimum low voltage
label	*(OCTET)	Label for BUS Message (System/Item)

, below, shows the values defined in the ecb-state Dictionary. These options represent the Electronic circuit breaker status. ecb-state Dictionary

Name	Value	Definition
UNKNOWN	%d0	Circuit is in an unknown condition
OFF	%d1	Circuit is turned off
ON	%d2	Circuit is turned on
UNDERCUR	%d3	Circuit is on, <100ma current drawn
RESET	%d4	Request Reset
FORWARD	%d5	ECB is active logical FWD direction
REVERSE	%d6	ECB is active logical REV direction
TARGET	%d7	ECB is set by target, not ON/OFF
BRAKELOW	%d8	ECB is set by target, not ON/OFF
SHORTED	%d128	Short Circuit
OVERCUR	%d129	Overcurrent (but not short circuit)
OVERVOL	%d130	Overvoltage situation
DISABLED	%d131	Disabled by state-fault
RUNAWAY	%d132	Disabled due to runaway (trim/flaps)
COLLARED	%d133	Should not reset in flight
JAMMED	%d134	Mechanical Jam detected
PULLED	%d135	Pulled
BACKFLOW	%d136	Disabled due to reverse current flow

, below, shows the values defined in the ecb-flag Dictionary. These options represent the Electronic circuit breaker parameter flags. ecb-flag Dictionary

Name	Value	Definition
INPUTVOLTS	%x01	Input Volts field is valid

RANGE Parameter Format Range description format Parameter Identifier: %d11 Length: 24 Structure: RANGE Parameter Format

Item	Type	Description
numticks	uint16	How many valid ticks are in the parameter data
units	param-units	Specifier for units for display
divisor	int32	For display purposes, what are logical divisions
minval	int32	Minimum valid value
maxval	int32	Maximum valid value
mindisp	int32	Where display starts (values lower than this are clipped)
maxdisp	int32	Where display stops (values higher tha this are clipped)
ticks	starray	Actual tick data representing the scale marks

, below, shows the values defined in the param-units Dictionary. These options represent the Units for the encoding and translation of XSEDE parameters. param-units Dictionary

Name	Value	Definition
UNSPEC	%x00	Units not specified
INHG	%x00.01	Use inches of Hg for BARO/MANPRES
FT	%x00.02	Use feet for altitude
NM	%x00.03	Use nautical miles for distance
C	%x00.04	Use celsius for temperature
LBFT	%x00.05	Use pound-feet for torque
S	%x00.06	Use seconds for time
A	%x00.07	Use amps for current
V	%x00.08	Use volts for voltage
LB	%x00.09	Use pounds for weight
IN	%x00.0a	Use inches for distance
FPM	%x00.0b	Use feet per minute for rate of climb/descent
LBPH	%x00.0c	Pounds per Hour for fuel flow
DEGPS	%x00.0d	Degrees per second for attitude change
DEG	%x00.0e	Degrees for attitude
G	%x00.0f	G force for load
RGBA	%x00.10	8888 RGBA Value
KHZ	%x00.11	Kilohertz for Frequency
PCENT	%x00.12	Percent of Maximum
KT	%x00.13	Knots for Speed
NMPLB	%x00.14	Nautical Miles per Pound
KTPS	%x00.15	Knots per second
MACH	%x00.16	Speed of sound
CPM	%x00.17	Count per minute
PPM	%x00.18	Parts per million
LPM	%x00.19	Liters Per Minute
KW	%x00.1a	Kilowatt
AH	%x00.1b	Amp Hour
HPA	%x80.01	Use Hecto pascals for BARO
M	%x80.02	Use meters for altitude
SM	%x80.03	Use statute miles for distance
F	%x80.04	Use fahrenheit for temperature
NWM	%x80.05	Use Newton Meters for torque
PSI	%x80.06	Use PSI for MANPRES
MPH	%x80.07	Use miles per hour for speed
SMPLB	%x80.08	Statues Miles per Pound
MIN	%x80.09	Minutes
HR	%x80.0a	Hours
HP	%x80.0b	Use Horsepower for power
KG	%x80.0c	Use kilograms for weight
UL	%xff.ff	Unitless

GPIO Parameter Format GPIO summary format Parameter Identifier: %d12 Length: 12 Structure: GPIO Parameter Format

Item	Type	Description
features	uint32	4-bit Feature (XFS_GPIO_FEATURE_*) x 8
outmodes	uint32	4-bit Output modes (XFS_GPIO_OUTPUT_*) x 8
inmodes	uint16	2-bit Input modes (XFS_GPIO_INPUT_*) x 8
flags	uint16	Reserved for future use

APP Parameter Format APP status format Parameter Identifier: %d13 Length: length(data) + 56 Structure: APP Parameter Format

Item	Type	Description
state	scb-state	State of application*
rsvd	uint8	Reserved bits
appflags	uint16	Flags regarding app
period	uint16	Baseline runtime period (XFS_SCHED_PERIOD_*)
avgcpu	uint16	Average OS CPU time utilization in units per period over last second
hwcpu	uint16	High water OS CPU time utilization in units per period
cpulim	uint16	Limitation of OS CPU time utilization in units per period
runtime	uint16	Max allocated runtime (per period)
deadline	uint16	Deadline for completion (per period)
avgruntime	uint16	Average runtime over last 1s
hwruntime	uint16	High water runtime
ivcsw	uint32	Involuntary context switches
aircraftid	16*16(OCTET)	Aircraft Identifier
swrev	16*16(OCTET)	Software Version Identifier
label	*(OCTET)	Name of APP

, below, shows the values defined in the scb-state Dictionary. These options represent the Software circuit breaker states. scb-state Dictionary

Name	Value	Definition
UNKNOWN	%d0	State of software is unknown
STARTING	%d1	Application is in startup phase
RUNNING	%d2	Application is running
STOPPING	%d3	Stopping has been requested
RESTART	%d4	Restart Application (PULL + RESET + START)
RESET	%d5	Allow application to be started
HUNG	%d6	Application is running but is no longer responsive
DEGRADED	%d127	Application is running in a degraded mode
STOPPED	%d128	Application is stopped
STARTFAIL	%d129	Application failed startup
RUNAWAY	%d130	Application has a runaway loop
OVERCPU	%d131	Application is using excessive CPU while in RUNNING state
OVERMEM	%d132	Application terminated due to memory overrun
EXCEPTION	%d133	Application terminated due to runtime exception
ENDED	%d134	Application ended without error or request
ENDERROR	%d135	Application ended with error condition
PULLED	%d136	Application should not be allowed to run until reset
COLLARED	%d137	Should not reset in flight

WBRANGE Parameter Format Weight and Balance Range Parameter Identifier: %d14 Length: 16 Structure: WBRANGE Parameter Format

Item	Type	Description
flags	uint16	Flags if any
numslices	uint16	Number of slices specified
maxtakeoff	uint32	Max takeoff weight
maxlanding	uint32	Max landing weight
maxzerofuel	uint32	Max zero fuel weight
slices	starray	Slices that form weight and balance envelope

UPDATE Parameter Format Aircraft Update Progress Parameter Identifier: %d15 Length: length(data) + 56 Structure: UPDATE Parameter Format

Item	Type	Description
aircraftid	16*16(OCTET)	Aircraft Identifier
progress	uint32	Progress
progflags	msg-cmd-updstat-flag	Progress Flags
activity	32*32(OCTET)	Description of current activity
label	*(OCTET)	Name of CPU being updated

, below, shows the values defined in the msg-cmd-updstat-flag Dictionary. These options represent the Maintenance mode status update flags. msg-cmd-updstat-flag Dictionary

Name	Value	Definition
SUCCESS	%x01	Update is complete and successful
ERROR	%x02	Error during update

SERVO Parameter Format Position with flags to interpret whether servo should be engaged, disengaged or left alone and whether active Parameter Identifier: %d16 Length: 8 Structure: SERVO Parameter Format

Item	Type	Description
servopos	int32	undefined
servomode	afcs-servo	undefined

, below, shows the values defined in the afcs-servo Dictionary. These options represent the Servo engagement flags. afcs-servo Dictionary

Name	Value	Definition
ENGAGE	%x80.00.00.00	If present in engagement request, along with 'ENGAGED' value, set engagement status
ENGAGED	%d1	For requests, retain current engagement state, for status, present if currently engaged
DISENGAGED	%d0	If engaged, disengage and for status, currently disengaged

DBASE Parameter Format Database Information Parameter Identifier: %d17 Length: 92 Structure: DBASE Parameter Format

Item	Type	Description
crc	uint32	undefined
name	16*16(OCTET)	Name of database (e.g., com)
supplier	16*16(OCTET)	Who supplied the database
region	16*16(OCTET)	What region is the data valid
cycle	16*16(OCTET)	What cycle
valid	12*12(OCTET)	date at which validity begins YYYY-MM-DD string
expires	12*12(OCTET)	date after which data has data YYYY-MM-DD string

Parameter Ranges All parameter attributes values are typed, but some are further constrained to certain ranges. The ranges may limited in both value and for display purposes. The display 'ticks' can define various classifications such as a green, yellow, or red range. Furthermore, ranges can change over time. For instance, good oil pressure for a cold engine may be normally higher than that for a warm engine and a special parameter can be broadcast to indicate a range change. defines the RANGE parameter format. Parameters that have a default range have that range described in the next section. The default range will be displayed in tabular format. Many parameters have default and unchangable ranges, while others have daynamic ranges. Parameters that have dynamic ranges use a parameter that only differs in the length portion of the Parameter Data Len & Ident attribute. and having a RANGE attibute as its payload. The receiving node MUST distinguish between the value and the range parameters by examining the length portion of the parameter's attribute. Should a parameter attribute value be outside the permitted range. the value MUST be ignored. In the style of the next section, a generic range parameter is defined below:

Sample Range Parameter

• Parameter ID: Same as main parameter.
• Unit Usage: Same as main parameter.
• SubUnit Usage: Same as main parameter.
• Length: RANGE Length - 24 decimal plus tick data length.
• Format: RANGE (See .)

Ranges This section defines the default attribute ranges that are used in XSEDE.

SERVO Range Default

• Minimum Value: -100000
• Maximum Value: 100000
• Minimum Display Value: -100000
• Maximum Display Value: 100000
• Divisor: 1000

ROLL Range Default

• Minimum Value: -18000
• Maximum Value: 17999
• Minimum Display Value: -18000
• Maximum Display Value: 17999
• Divisor: 100

PITCH Range Default

• Minimum Value: -9000
• Maximum Value: 8999
• Minimum Display Value: -9000
• Maximum Display Value: 9000
• Divisor: 100

PERCENT Range Default

• Minimum Value: 0
• Maximum Value: 100
• Minimum Display Value: 0
• Maximum Display Value: 100
• Divisor: 1

THOUPERCENT Range Default

• Minimum Value: 0
• Maximum Value: 100000
• Minimum Display Value: 0
• Maximum Display Value: 100000
• Divisor: 100

HDG Range Default

• Minimum Value: 100
• Maximum Value: 36099
• Minimum Display Value: 1
• Maximum Display Value: 36000
• Divisor: 100

OBS Range Default

• Minimum Value: 1000
• Maximum Value: 360000
• Minimum Display Value: 0
• Maximum Display Value: 360000
• Divisor: 1000

DEVIATION Range Default

• Minimum Value: -1000
• Maximum Value: 1000
• Minimum Display Value: -1000
• Maximum Display Value: 1000
• Divisor: 1

FLAPS Range Default

• Minimum Value: -1000
• Maximum Value: 1000
• Minimum Display Value: -1000
• Maximum Display Value: 1000
• Divisor: 1

BRIGHTNESS Range Default

• Minimum Value: 0
• Maximum Value: 2000
• Minimum Display Value: 0
• Maximum Display Value: 2000
• Divisor: 1

COMFREQ Range Default

• Minimum Value: 118000
• Maximum Value: 135999
• Minimum Display Value: 118000
• Maximum Display Value: 135999
• Divisor: 1

NAVFREQ Range Default

• Minimum Value: 108000
• Maximum Value: 117999
• Minimum Display Value: 108000
• Maximum Display Value: 117999
• Divisor: 1

Parameter Types This section declares the initial set of XSEDE parameters. Each parameter is defined by a name and a short description. This is followed by the numeric parameter ID. Next, the meanings of the unit and subunit fields are provided, if applicable. and finally the parameter data format and a reference to the appropriate table defining the parameter attribute type.

GOAROUND - Go around requested

• Parameter ID: %x00.00.00
• Unit Usage: None
• SubUnit Usage: None
• Format: BOOL (See .)
• Range: parameter MUST NOT be sent with a range attribute.

P-ALT - Pressure Altitude

• Parameter ID: %x00.00.01
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 10.

T-ALT - True Altitude

• Parameter ID: %x00.00.02
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: FT multiplied by 10.

IAS - Indicated Airspeed

• Parameter ID: %x00.00.03
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: KT multiplied by 100.

CAS - Calibrated Airspeed

• Parameter ID: %x00.00.04
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: KT multiplied by 100.

CASMSG - Crew Alerting System Message

• Parameter ID: %x00.00.05
• Unit Usage: CAS System ID
• SubUnit Usage: None
• Format: CASMSG (See .)
• Range: parameter MUST NOT be sent with a range attribute.

THROTPOS - Throttle position

• Parameter ID: %x00.00.06
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)

INAIR - Are we in the air (vs. on the ground)

• Parameter ID: %x00.00.07
• Unit Usage: None
• SubUnit Usage: None
• Format: BOOL (See .)
• Range: parameter MUST NOT be sent with a range attribute.

BARO - Current barometric setting

• Parameter ID: %x00.00.08
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: INHG multiplied by 1000.

CLTPOS - Collective Position

• Parameter ID: %x00.00.09
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

CLTPOSREQ - A/P Requested Collective Position

• Parameter ID: %x00.00.0a
• Unit Usage: None
• SubUnit Usage: None
• Format: SERVO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

MAGHDG - Magnetic Heading

• Parameter ID: %x00.00.0b
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

MAGCRS - Magnetic Course (via RNAV)

• Parameter ID: %x00.00.0c
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

TRUECRS - True Course (via RNAV)

• Parameter ID: %x00.00.0d
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

MAGDTK - Desired Course (via RNAV)

• Parameter ID: %x00.00.0e
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

TRUEDTK - Desired course (via RNAV)

• Parameter ID: %x00.00.0f
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

LAT - Current position latitude

• Parameter ID: %x00.00.10
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEG multiplied by 10000000.

LON - Current position longitude

• Parameter ID: %x00.00.11
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEG multiplied by 10000000.

RNAVALT - Altitude measured by RNAV

• Parameter ID: %x00.00.12
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 10.

ROLL - Current degrees of roll, -18000 being being upside down towards left, 18000 being upside down to the right

• Parameter ID: %x00.00.13
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: ROLL (See .)
• Units: DEG multiplied by 100.

PITCH - Current degrees of pitch, 9000 being straight up, -9000 being straight down

• Parameter ID: %x00.00.14
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PITCH (See .)
• Units: DEG.

YAW - Yaw/Inclination as measured in G force

• Parameter ID: %x00.00.15
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: G multiplied by 10000.

FUELTOT - Computed remaining fuel (divisor may be overridden by fuel type in FUELLEVLR)

• Parameter ID: %x00.00.16
• Unit Usage: Fuel System ID/0=Sum of all
• SubUnit Usage: 0 = current total, 1 = total at end of flight
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

RNAVHFOM - Horizontal Figure of Merit

• Parameter ID: %x00.00.17
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: M multiplied by 100.

RNAVVFOM - Vertical Figure of Merit

• Parameter ID: %x00.00.18
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: M multiplied by 100.

RNAVHPL - Horizontal Protection Level

• Parameter ID: %x00.00.19
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: M multiplied by 100.

RNAVVPL - Vertical Protection Level

• Parameter ID: %x00.00.1a
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: M multiplied by 100.

IASRT - Indicated Airspeed Rate of Change

• Parameter ID: %x00.00.1b
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KTPS multiplied by 100.

KBDSEL - Activate the named on-screen keyboard or none if empty

• Parameter ID: %x00.00.1c
• Unit Usage: Display
• SubUnit Usage: None
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

KEYPRESS - Send the FMS encoded key press to the given display

• Parameter ID: %x00.00.1d
• Unit Usage: Display
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using osk_key dictionary (See .)

, below, shows the values defined in the osk-key Dictionary. These options represent the On screen keyboard keys. osk-key Dictionary

Name	Value	Definition
0	%d48	Character 0
1	%d49	Character 1
2	%d50	Character 2
3	%d51	Character 3
4	%d52	Character 4
5	%d53	Character 5
6	%d54	Character 6
7	%d55	Character 7
8	%d56	Character 8
9	%d57	Character 9
A	%d65	Character A
B	%d66	Character B
C	%d67	Character C
D	%d68	Character D
E	%d69	Character E
F	%d70	Character F
G	%d71	Character G
H	%d72	Character H
I	%d73	Character I
J	%d74	Character J
K	%d75	Character K
L	%d76	Character L
M	%d77	Character M
N	%d78	Character N
O	%d79	Character O
P	%d80	Character P
Q	%d81	Character Q
R	%d82	Character R
S	%d83	Character S
T	%d84	Character T
U	%d85	Character U
V	%d86	Character V
W	%d87	Character W
X	%d88	Character X
Y	%d89	Character Y
Z	%d90	Character Z
PREV	%d60	Previous position or <
NEXT	%d62	Next position or >

SURFPOS - Position of arbitrary control surface

• Parameter ID: %x00.00.1e
• Unit Usage: Surface Type
• SubUnit Usage: Surface Type Subassembly
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)

SURFREQ - Requested control surface position

• Parameter ID: %x00.00.1f
• Unit Usage: Surface Type
• SubUnit Usage: Surface Type Subassembly
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

SURFTORQUE - Aerodynamic torque applied to a control surface relative to movement

• Parameter ID: %x00.00.20
• Unit Usage: Surface Type
• SubUnit Usage: Surface Type Subassembly
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LBFT multiplied by 100.

SURFFORCE - Aerodynamic force applied to a control surface relative to movement

• Parameter ID: %x00.00.21
• Unit Usage: Surface Type
• SubUnit Usage: Surface Type Subassembly
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

WINDSPD - Wind Speed

• Parameter ID: %x00.00.22
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

WINDBRG - True Bearing from which wind blows

• Parameter ID: %x00.00.23
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

COMFREQKHZ - Communication Frequency

• Parameter ID: %x00.00.24
• Unit Usage: Radio ID
• SubUnit Usage: 0=Radio /1+=Presets
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: COMFREQ (See .)
• Units: KHZ.

NAVFREQKHZ - Navigation Frequency

• Parameter ID: %x00.00.25
• Unit Usage: Radio ID
• SubUnit Usage: 0=Radio /1+=Presets
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: NAVFREQ (See .)
• Units: KHZ.

COMVOL - Communication Volume (0-100)

• Parameter ID: %x00.00.26
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PERCENT (See .)
• Units: PCENT.

NAVVOL - Communication Volume (0-100)

• Parameter ID: %x00.00.27
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PERCENT (See .)
• Units: PCENT.

COMSQL - Communication Squelch (0-100)

• Parameter ID: %x00.00.28
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PERCENT (See .)
• Units: PCENT.

MUX - Selected multiplexer input or output

• Parameter ID: %x00.29
• Unit Usage: MUX ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ICSVOL - Intercom Volume (0-100)

• Parameter ID: %x00.00.2a
• Unit Usage: Audio Panel Unit
• SubUnit Usage: 0=System, 1=Pilot, 2=Copilot, rest are pax
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PERCENT (See .)
• Units: PCENT.

COMSTATE - COM radio state

• Parameter ID: %x00.00.2b
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using com_state dictionary (See .)

, below, shows the values defined in the com-state Dictionary. These options represent the State of communication radio. com-state Dictionary

Name	Value	Definition
IDLE	R	Ready to Receive (Idle)
RX	r	Active receiving
TX	T	Active transmitting
STUCK	S	Stuck Mic
FAULT	F	Fault

ICSRXCOMS - Which COM Radios to Monitor (mask)

• Parameter ID: %x00.00.2c
• Unit Usage: Audio Panel Unit
• SubUnit Usage: 0=System, 1=Pilot, 2=Copilot, rest are pax
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ICSRXNAVS - Which NAV Radios to Monitor (mask)

• Parameter ID: %x00.00.2d
• Unit Usage: Audio Panel Unit
• SubUnit Usage: 0=System, 1=Pilot, 2=Copilot, rest are pax
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ICSMODE - Intercom Mode

• Parameter ID: %x00.00.2e
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using ics_mode dictionary (See .)

, below, shows the values defined in the ics-mode Dictionary. These options represent the State of intercom system. ics-mode Dictionary

Name	Value	Definition
PILOT	P	Pilot Isolate
CREW	C	Crew Isolate
ALL	A	All
FEATUREMASK	%xff.00	Mask for intercom features
POSITIONAL	%x01.00	Positional dynamic audio

ICSTXCOMS - Which COM Radios to Transmit (mask)

• Parameter ID: %x00.00.2f
• Unit Usage: Audio Panel Unit
• SubUnit Usage: 0=System, 1=Pilot, 2=Copilot, rest are pax
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

DATE - Date in YYYY-MM-DD format

• Parameter ID: %x00.00.30
• Unit Usage: None
• SubUnit Usage: None
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

GLOAD - Current Normal to Aircraft Loading

• Parameter ID: %x00.00.31
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: G multiplied by 1000.

RATEOFTURN - Turn Coordinator Rate Per Second

• Parameter ID: %x00.00.32
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEG multiplied by 1000.

GROUNDSPEED - Groundspeed

• Parameter ID: %x00.00.33
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

VSPEED - Vertical speed

• Parameter ID: %x00.00.34
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FPM multiplied by 1.

XPDRIDENT - XPDR Ident request (USERSELECT only). Non-standby transponders must IDENT regardless of UNIT. Used only to request IDENT, but IDENT state reported in XPDRMODE

• Parameter ID: %x00.00.35
• Unit Usage: Always zero
• SubUnit Usage: None
• Format: BOOL (See .)
• Range: parameter MUST NOT be sent with a range attribute.

XPDRRPS - XPDR Replies per second (normalized)

• Parameter ID: %x00.00.36
• Unit Usage: XPDR ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

XPDRSQUAWK - XPDR Squawk as decimal integer (e.g., 1200). All transponders must change SQUAWK regardless of UNIT

• Parameter ID: %x00.00.37
• Unit Usage: XPDR ID (Rx Only) Zero for USERSELECT
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

XPDRMODE - XPDR Mode. Note that IDENT flag is ignored in USERSELECT condition.

• Parameter ID: %x00.00.38
• Unit Usage: XPDR ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using xpdr_mode dictionary (See .)

, below, shows the values defined in the xpdr-mode Dictionary. These options represent the Transponder mode and flags. xpdr-mode Dictionary

Name	Value	Definition
UNKNOWN	%d0	Unknown
MODEMASK	%x7f	Mask for mode
STANDBY	O	Standby
GND	G	On Ground
AIR	A	Air/Altitude Reporting
FLAG-IDENT	%x80	IDENT Active

NAVOBS - NAV OBS Value

• Parameter ID: %x00.00.39
• Unit Usage: Radio/FMS ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: OBS (See .)
• Units: DEG multiplied by 1000.

NAVBRG - Bearing to nav aid

• Parameter ID: %x00.00.3a
• Unit Usage: Radio/FMS ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

NAVCDI - Course Deviation (-1000 to 1000)

• Parameter ID: %x00.00.3b
• Unit Usage: Radio/FMS ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: DEVIATION (See .)

NAVGSI - Glide Slope (-1000 to 1000)

• Parameter ID: %x00.00.3c
• Unit Usage: Radio/FMS ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: DEVIATION (See .)

NAVFLAGS - Navigation Flags (see XFS_NAV_FLAG_*

• Parameter ID: %x00.00.3d
• Unit Usage: Radio/FMS ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using nav_flag dictionary (See .)

, below, shows the values defined in the nav-flag Dictionary. These options represent the Navigational flag states. nav-flag Dictionary

Name	Value	Definition
BACKCOURSE	%x01	NAV receiver is flying a localizer back course
LOCDETECT	%x02	The NAV receiver is detecting a localizer
FROM	%x04	The FROM flag is detected from a VOR
TO	%x08	The TO flag is detected from a VOR
GSI-SFLAG	%x10	The glideslope superflag is present
GSI-VALID	%x20	The glideslope signal is being received and is valid
NAV-SFLAG	%x40	The NAV super flag is present
NAV-VALID	%x80	The localizer or VOR signal is being received and is valid
FAULT	%x01.00	Fault detected

FLAPREQ - Requested Flap Position 0 = up, 100000 = fully down, -100000 is fully negative

• Parameter ID: %x00.00.3e
• Unit Usage: Actuator/0=Aircraft
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

FLAPPOS - Flap actuator position, 0 = up, 100000 = fully down, -100000 is fully negative

• Parameter ID: %x00.00.3f
• Unit Usage: Actuator/0=Aircraft
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)

ECBSTAT - ECB Status change or request, see xfs_ecb.h

• Parameter ID: %x00.00.40
• Unit Usage: None
• SubUnit Usage: None
• Format: BUS (See .)
• Range: parameter MUST NOT be sent with a range attribute.

PTRIMREQ - Requested Pitch Trim Position (negative nose down, 0 neutral, positive nose up)

• Parameter ID: %x00.00.41
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

PTRIMPOS - Pitch Trim Position (negative nose down, 0 neutral, positive nose up)

• Parameter ID: %x00.00.42
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)

RTRIMREQ - Requested Roll Trim Position (negative left bank, 0 neutral, positive right bank)

• Parameter ID: %x00.00.43
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

RTRIMPOS - Roll Trim Position (negative left bank, 0 neutral, positive right bank)

• Parameter ID: %x00.00.44
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)

BUSSTAT - Status of Bus

• Parameter ID: %x00.00.45
• Unit Usage: None
• SubUnit Usage: None
• Format: BUS (See .)
• Range: parameter MUST NOT be sent with a range attribute.

TEMP - Arbitrary Temperature in a location

• Parameter ID: %x00.00.46
• Unit Usage: Location
• SubUnit Usage: Sensor Number/0=Average
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: C multiplied by 100.

TAS - True Airspeed

• Parameter ID: %x00.00.47
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

TAT - Total Air Temperature

• Parameter ID: %x00.00.48
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: C multiplied by 100.

OAT - Outside Air Temperature accounting for compressibility

• Parameter ID: %x00.00.49
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

D-ALT - Density Altitude

• Parameter ID: %x00.00.4a
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 10.

OILPRES - Oil Pressure

• Parameter ID: %x00.00.4b
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

OILTEMP - Oil Temp

• Parameter ID: %x00.00.4c
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

XFDFPS - XFD Display Frames Per Second (FPS)

• Parameter ID: %x00.00.4d
• Unit Usage: Display
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

TIREPRES - Tire Pressure

• Parameter ID: %x00.00.4e
• Unit Usage: Bogey
• SubUnit Usage: Tire
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

CHT - Cylinder Head Temperature

• Parameter ID: %x00.00.4f
• Unit Usage: Engine
• SubUnit Usage: Cylinder/0=Max
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

EGT - Exhaust Gas Temperature

• Parameter ID: %x00.00.50
• Unit Usage: Engine
• SubUnit Usage: Cylinder/0=Max
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

COOLTEMP - Coolant Temperature

• Parameter ID: %x00.00.51
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

FUELFLOW - Fuel Flow

• Parameter ID: %x00.00.52
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: LBPH multiplied by 100.

FUELPRES - Fuel Pressure

• Parameter ID: %x00.00.53
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

FUELLEVL - Fuel Level (divisor may be overridden by fuel type)

• Parameter ID: %x00.00.54
• Unit Usage: Fuel Tank ID/0=Sum of all
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: LB multiplied by 100.

MANPRES - Manifold pressure

• Parameter ID: %x00.00.55
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: INHG multiplied by 1000.

ENGRPM - Engine RPM

• Parameter ID: %x00.00.56
• Unit Usage: Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.

PROPRPM - Propeller RPM

• Parameter ID: %x00.00.57
• Unit Usage: Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.

MACH - Mach

• Parameter ID: %x00.00.58
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: MACH multiplied by 10000.

IASBUG - Target indicated airspeed

• Parameter ID: %x00.00.59
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

HDGBUG - Bugged Magnetic Heading

• Parameter ID: %x00.00.5a
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: HDG (See .)
• Units: DEG multiplied by 100.

ALTBUG - Bugged Altitude

• Parameter ID: %x00.00.5b
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: FT multiplied by 10.

WAYPOINT - A waypoint in a flight plan, subunit is the position in flightplan, beginning with 1 for the first waypoint. Subunit 0 is only used to indicate an empty flight plan.

• Parameter ID: %x00.00.5c
• Unit Usage: FMS ID
• SubUnit Usage: None
• Format: WAYPOINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

INSERT - Insert a waypoint in a flight plan, subunit is the position in flightplan which it should become (SYSSEL/USERSEL ONLY)

• Parameter ID: %x00.00.5d
• Unit Usage: FMS ID
• SubUnit Usage: None
• Format: WAYPOINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

DELETE - Delete a waypoint in a flight plan, subunit is the position in flightplan starting at 1 (SYSSEL/USERSEL ONLY). Label must match

• Parameter ID: %x00.00.5e
• Unit Usage: FMS ID
• SubUnit Usage: None
• Format: WAYPOINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

NOTE - Notation of something important within the quick access log or bus

• Parameter ID: %x00.00.5f
• Unit Usage: None
• SubUnit Usage: None
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

NAVGPS - GPS Mode

• Parameter ID: %x00.00.60
• Unit Usage: NAV radio unit or FMS Unit Number
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using nav_gps dictionary (See .)

, below, shows the values defined in the nav-gps Dictionary. These options represent the Global positioning system status. nav-gps Dictionary

Name	Value	Definition
UNKNOWN	%d0	GPS Navigation is in unknown state
ENROUTE	%d1	GPS Navigation is in Enroute state
TERMINAL	%d2	GPS Navigation is Terminal state
LNAV	%d3	GPS Navigation is in Lateral Navigation State
LNAVVNAV	%d4	GPS Navigation is Lateral and Vertical NAV state
LP	%d5	GPS Navigation is in Localizer Performance state
LPV	%d6	GPS Navigation is in Localizer Performance/Vertical state

NAVDIS - Distance to next or last waypoint or DME for VOR/ILS/etc

• Parameter ID: %x00.00.61
• Unit Usage: FMS Unit Number
• SubUnit Usage: 0 = next waypoint, 1 = last waypoint
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: NM multiplied by 1000.

NAVXTK - Cross track error (negative is left)

• Parameter ID: %x00.00.62
• Unit Usage: FMS Unit Number
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: NM multiplied by 1000.

NAVETE - Time to next or last waypoint

• Parameter ID: %x00.00.63
• Unit Usage: FMS Unit Number
• SubUnit Usage: 0 = next waypoint, 1 = last waypoint
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: S multiplied by 100.

BRIGHTNESS - Universal display brightness (0-1000 for night time mode, 1000-2000 for daytime modes

• Parameter ID: %x00.00.64
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: BRIGHTNESS (See .)

MANTEMP - Manifold temperature

• Parameter ID: %x00.00.65
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: C multiplied by 100.

DIRECT - Go direct to a waypoint in a flight plan, subunit is the position in flightplan starting at 1 (SYSSEL/USERSEL ONLY). Label must match

• Parameter ID: %x00.00.66
• Unit Usage: None
• SubUnit Usage: None
• Format: WAYPOINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ACTIVATE - Activate leg terminating at waypoint in a flight plan, subunit is the position in flightplan (SYSSEL/USERSEL ONLY). Label must match

• Parameter ID: %x00.00.67
• Unit Usage: None
• SubUnit Usage: None
• Format: WAYPOINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

MMPARAM - Moving Map parameters. Subunit is one of XFS_MM_PARAM_*

• Parameter ID: %x00.00.68
• Unit Usage: MOVMAP ID
• SubUnit Usage: XFS_MM_PARAM_*
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

SERVOREQ - Requested servo position and state

• Parameter ID: %x00.00.69
• Unit Usage: None
• SubUnit Usage: None
• Format: SERVO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

SERVOPOS - Current servo actuator position

• Parameter ID: %x00.00.6a
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

SONICHAT - Ultrasonic rangefinder height above terrain

• Parameter ID: %x00.00.6b
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 100.

LIDARHAT - LIDAR rangefinder height above terrain

• Parameter ID: %x00.00.6c
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 100.

RADARHAT - Radar rangefinder height above terrain

• Parameter ID: %x00.00.6d
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 100.

HAT - Computed height above terrain

• Parameter ID: %x00.00.6e
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: FT multiplied by 100.

COMSTANDBY - Standby COM Frequency (same rules and range as COMFREQKHZ)

• Parameter ID: %x00.00.6f
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: COMFREQ (See .)

NAVSTANDBY - Standby NAV Frequency (same rules and range as NAVFREQKHZ)

• Parameter ID: %x00.00.70
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: NAVFREQ (See .)

STALLSPEED - Estimated real-time Stall speed

• Parameter ID: %x00.00.71
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

TIMEMS - Time in milliseconds from midnight zulu time

• Parameter ID: %x00.00.72
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

YTRIMREQ - Requested Yaw Trim Position (negative left, 0 neutral, positive right)

• Parameter ID: %x00.00.73
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

YTRIMPOS - Yaw Trim Position (negative left, 0 neutral, positive right)

• Parameter ID: %x00.00.74
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)

VSPEEDBUG - Vertical speed bug in fpm

• Parameter ID: %x00.00.75
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

MUSICSRC - Music Source (0 = none)

• Parameter ID: %x00.00.76
• Unit Usage: Audio Panel Unit
• SubUnit Usage: 0=System, 1=Pilot, 2=Copilot, rest are pax
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

AOA - Angle of attack as an actual angle

• Parameter ID: %x00.00.77
• Unit Usage: Source
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEG multiplied by 1000.

AOAR - Angle of attack range -- should contain green (beginning of approach range), white (reference angle), yellow (approaching stall) and a red (imminent stall)

• Parameter ID: %x00.00.77
• Unit Usage: None
• SubUnit Usage: None
• Format: RANGE (See .)
• Range: parameter MUST NOT be sent with a range attribute.

GPIO - GPIO Input/Output

• Parameter ID: %x00.00.78
• Unit Usage: I/O Module
• SubUnit Usage: Module Port (0 or 1-8)
• Format: GPIO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ANALOG - Raw Analog value 0-4095

• Parameter ID: %x00.00.79
• Unit Usage: I/O Module
• SubUnit Usage: Module Port (1-8)
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

PWM - PWM value 0-4095 -- subunit is port number, 1-8

• Parameter ID: %x00.00.7a
• Unit Usage: I/O Module
• SubUnit Usage: Module Port (1-8)
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

XPDRACID - ICAO 24-bit Aircraft Identifier

• Parameter ID: %x00.00.7b
• Unit Usage: XPDR ID (Rx Only) Zero for USERSELECT
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

XPDRFLID - Up to 8-character, NULL terminated flight ID

• Parameter ID: %x00.00.7c
• Unit Usage: XPDR ID (Rx Only) Zero for USERSELECT
• SubUnit Usage: None
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

THROTREQ - Requested throttle position

• Parameter ID: %x00.00.7d
• Unit Usage: None
• SubUnit Usage: None
• Format: SERVO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

RPMREQ - Prop governor requested RPM

• Parameter ID: %x00.00.7e
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

TACHTIME - Tachometer time, unit is engine

• Parameter ID: %x00.00.7f
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: S.

TOTTIME - Total aircraft time

• Parameter ID: %x00.00.80
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: S.

APPSTAT - Application Status / Requests

• Parameter ID: %x00.00.00.81
• Unit Usage: CPU ID
• SubUnit Usage: Process ID
• Format: APP (See .)
• Range: parameter MUST NOT be sent with a range attribute.

CDINAVSRC - Select index (> 0) of CDI NAV Source or 0 for none

• Parameter ID: %x00.00.82
• Unit Usage: Display
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

BRGNAVSRC - Select index (> 0) CDI BRG Source or 0 for none

• Parameter ID: %x00.00.83
• Unit Usage: Display
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

COMSEL - Select COM Radio for Tuning

• Parameter ID: %x00.00.84
• Unit Usage: Display
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

NAVSEL - Select NAV Radio for Tuning

• Parameter ID: %x00.00.85
• Unit Usage: Display
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

MSTRCAUTN - Master Caution Active when true. Resets by SYSSEL/USERSEL with value of FALSE

• Parameter ID: %x00.00.86
• Unit Usage: None
• SubUnit Usage: None
• Format: BOOL (See .)
• Range: parameter MUST NOT be sent with a range attribute.

MSTRWARN - Master Warning Active when true. Resets by SYSSEL/USERSEL with value of FALSE

• Parameter ID: %x00.00.87
• Unit Usage: None
• SubUnit Usage: None
• Format: BOOL (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ROLLRT - Rate of change of about A/C longitudinal axis (P)

• Parameter ID: %x00.00.88
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEGPS multiplied by 1000.

PITCHRT - Rate of change about A/C transverse axis (Q)

• Parameter ID: %x00.00.89
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEGPS multiplied by 1000.

YAWRT - Rate of change about A/C vertical axis (R)

• Parameter ID: %x00.00.8a
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEGPS multiplied by 1000.

STKPITCH - Stick Pitch Position (negative nose down, 0 neutral, positive nose up)

• Parameter ID: %x00.00.8b
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

STKROLL - Stick Roll Position (negative left bank, 0 neutral, positive right bank)

• Parameter ID: %x00.00.8c
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

STKYAW - Pedal Yaw Position (negative left, 0 neutral, positive right)

• Parameter ID: %x00.00.8d
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: SERVO (See .)

BATTTEMP - Battery Temp

• Parameter ID: %x00.00.8e
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

MOTORTEMP - Motor Temp

• Parameter ID: %x00.00.8f
• Unit Usage: Motor
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

POWERTEMP - Temp of a device supplying/converting power to a propulsion system

• Parameter ID: %x00.00.90
• Unit Usage: Propulsion System
• SubUnit Usage: Power converter/0=Max
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

TORQUE - Torque

• Parameter ID: %x00.00.91
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: LBFT multiplied by 100.

TAILNUM - Up to 8-character, NULL terminated tail number

• Parameter ID: %x00.00.92
• Unit Usage: None
• SubUnit Usage: None
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

ROLLREQ - F/D requested degrees of roll in 100 * degrees with 0 being right side up, -18000 being being upside down towards left, 18000 being upside down to the right

• Parameter ID: %x00.00.93
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: ROLL (See .)

PITCHREQ - F/D requested degrees of pitch in 100 * degrees with 0 being straight ahead, 9000 being straight up, -9000 being straight down

• Parameter ID: %x00.00.94
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PITCH (See .)

YAWREQ - F/D requested G force of inclination with 0 being no yaw

• Parameter ID: %x00.00.95
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: G multiplied by 10000.

STKPITCHREQ - A/P Requested Stick Pitch Position (negative nose down, 0 neutral, positive nose up)

• Parameter ID: %x00.00.96
• Unit Usage: None
• SubUnit Usage: None
• Format: SERVO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

STKROLLREQ - A/P Requested Stick Roll Position (negative left bank, 0 neutral, positive right bank)

• Parameter ID: %x00.00.97
• Unit Usage: None
• SubUnit Usage: None
• Format: SERVO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

STKYAWREQ - A/P Requested Pedal Yaw Position (negative left, 0 neutral, positive right)

• Parameter ID: %x00.00.98
• Unit Usage: None
• SubUnit Usage: None
• Format: SERVO (See .)
• Range: parameter MUST NOT be sent with a range attribute.

FDMODEACT - Active Flight Director Modes

• Parameter ID: %x00.00.99
• Unit Usage: FD Number (0 for setting values)
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using afcs_fd_mode dictionary (See .)

, below, shows the values defined in the afcs-fd-mode Dictionary. These options represent the Vertical, lateral and yaw modes of flight director. afcs-fd-mode Dictionary

Name	Value	Definition
VERT-MASK	%xff	Vertical modes mask
LAT-MASK	%xff.00	Lateral modes mask
YAW-MASK	%xff.00.00.00	Yaw modes mask
PITCH	%x01	Activate pitch mode
VS	%x02	Activate vertical speed mode
FLC	%x04	Activate indicated airspeed mode / flight level change
PRF	%x08	Activate angle of attack / performance mode
ALT	%x10	Arm Altitude mode
VNAV	%x20	Arm vertical nav mode
GP	%x40	Arm approach mode vertical portion
FLARE	%x80	Arm flare mode
ROLL	%x01.00	Activate wing leveler mode
HDG	%x02.00	Activate heading mode
NAV	%x04.00	Arm navigation mode
APPR	%x08.00	Arm approach mode
YD	%x01.00.00.00	Fixed Yaw Damper
SLIP	%x02.00.00.00	Activate slip mode (adjustable YD)
SLIPAPPR	%x04.00.00.00	Activate approach slip mode (adjustable YD)

FDMODEARM - Armed Flight Director Modes (XFS_AFCS_FD_MODE_*

• Parameter ID: %x00.00.9a
• Unit Usage: FD Number (0 for setting values)
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using afcs_fd_mode dictionary (See .)

ALTHOLDBUG - Altitude used by FD for altitude hold

• Parameter ID: %x00.00.9b
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FT multiplied by 10.

APMODE - Autopilot Modes

• Parameter ID: %x00.00.9c
• Unit Usage: AP Number (0 for setting value)
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using afcs_ap_mode dictionary (See .)

, below, shows the values defined in the afcs-ap-mode Dictionary. These options represent the Vertical, lateral and yaw modes of autopilot and throttle. afcs-ap-mode Dictionary

Name	Value	Definition
VERT-MASK	%xff	Vertical modes mask
LAT-MASK	%xff.00	Lateral modes mask
THROT-MASK	%xff.00.00	Throttle modes mask
YAW-MASK	%xff.00.00.00	Yaw modes mask
PITCH	%x01	Pitch mode
EPPITCH	%x02	Pitch mode only for envelope protection
ROLL	%x01.00	Roll mode
EPROLL	%x02.00	Roll mode only for envelope protection
SPD	%x01.00.00	Activate autothrottle speed tracking
EPSPD	%x02.00.00	Autothrottle only for envelope protection (SPD mode)
AOA	%x04.00.00	Activate autothrottle AoA tracking
EPAOA	%x08.00.00	Autothrottle only for envelope protection (AOA mode)
TOGA	%x10.00.00	Activate takeoff / go-around throttle
EPTOGA	%x20.00.00	Autothrottle only for envelope protection (TOGA mode)
YAW	%x01.00.00.00	Yaw mode
EPYAW	%x02.00.00.00	Yaw envelope protection

ICSSQL - Intercom Squelch (0-100)

• Parameter ID: %x00.00.9d
• Unit Usage: Audio Panel Unit
• SubUnit Usage: 0=System, 1=Pilot, 2=Copilot, rest are pax
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PERCENT (See .)
• Units: PCENT.

PITCHBUG - Target pitch

• Parameter ID: %x00.00.9e
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PITCH (See .)
• Units: DEG multiplied by 100.

PTSPEED - Power Turbine Speed (commonly N1)

• Parameter ID: %x00.00.9f
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PCENT multiplied by 1000.

GTSPEED - Gas Turbine Speed (commonly N2 or Ng)

• Parameter ID: %x00.00.a0
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PCENT multiplied by 1000.

TIT - Turbine Inlet Temperature

• Parameter ID: %x00.00.a1
• Unit Usage: Engine
• SubUnit Usage: Turbo/0=Max
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

ITT - Inter-Turbine Temperature

• Parameter ID: %x00.00.a2
• Unit Usage: Engine
• SubUnit Usage: Sensor /0=Average
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

POWER - Power under current engine and environmental conditions relative to engine design maximum

• Parameter ID: %x00.00.a3
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: SERVO (See .)
• Units: PCENT multiplied by 1000.

ENGSTATUS - Engine specific set of flags or values

• Parameter ID: %x00.00.a4
• Unit Usage: Motor/Engine
• SubUnit Usage: Engine Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

CABINALT - Cabin Equivalent Altitude

• Parameter ID: %x00.00.a5
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: FT multiplied by 10.

CABINALTREQ - Cabin Equivalent Altitude

• Parameter ID: %x00.00.a6
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: FT multiplied by 10.

DIFFPRES - Differential Pressure

• Parameter ID: %x00.00.a7
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

DIFFPRESREQ - Requested Differential Pressure

• Parameter ID: %x00.00.a8
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

FUELTEMP - Arbitrary Temperature in a location

• Parameter ID: %x00.00.a9
• Unit Usage: Engine/Fuel Tank
• SubUnit Usage: SubLocation /0=Average, 1=Sump
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: C multiplied by 100.

ENGSTATE - Engine operating state

• Parameter ID: %x00.00.aa
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using engstate dictionary (See .)

, below, shows the values defined in the engstate Dictionary. These options represent the States of engines. engstate Dictionary

Name	Value	Definition
UNKNOWN	%x00	Engine Status Unknown
OFF	%x01	Engine is Off
DRYMOTOR	%x02	Engine Starting
STARTING	%x03	Engine Starting
RUNNING	%x04	Engine Running Normally
FLAMEOUT	%x05	Engine Flamed Out / Failure
SHUTDOWN	%x06	Engine Shutting Down
SHUTOFF	%x07	Engine Shut Off
MODE-MASK	%xff	Mask for Engine State
FLAG-IGNITION	%x01.00	Ignition On
FLAG-FUEL	%x02.00	Fuel Shutoff Open
FLAG-STARTER	%x04.00	Starter On
FLAG-GENERATOR	%x08.00	Generator On
FLAG-BLEED	%x10.00	Bleed Air On
FLAG-FIRE	%x01.00.00	Fire Present
FLAG-EXTINGUISH	%x02.00.00	Extinguisher Dispensed

ENGSTATEREQ - Requested Engine operating state

• Parameter ID: %x00.00.ab
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using engstate dictionary (See .)

BLEEDAIR - Bleed Air Level (Percent of Max)

• Parameter ID: %x00.00.ac
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: PCENT multiplied by 100.

BLEEDAIRREQ - Requested Bleed Air Level

• Parameter ID: %x00.00.ad
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: PCENT multiplied by 100.

LIGHTING - Lighting Color/Level

• Parameter ID: %x00.00.ae
• Unit Usage: System
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: RGBA.

LIGHTINGREQ - Requested Lighting Color/Level

• Parameter ID: %x00.00.af
• Unit Usage: System
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: RGBA.

ICING - Deicing State

• Parameter ID: %x00.00.b0
• Unit Usage: System/0=Aircraft
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using icing_flag dictionary (See .)

, below, shows the values defined in the icing-flag Dictionary. These options represent the Status of ice detection, anti-ice and deicing systems. icing-flag Dictionary

Name	Value	Definition
ENGINE	%x01	Engine Deicing/Anticing On
AIRFRAME	%x02	Airframe Deicing/Anticing On
INSEP	%x04	Inertial Separator Activated
PITOT	%x08	Pitot/Static Heat Activated
PROPHEAT	%x10	Propeller Heat Activated
WINDHEAT	%x20	Windshield Heat Activated
CARBHEAT	%x40	Carb Heat Activated
CARBICEDET	%x40.00	Carb Icing Detected
ICEDET	%x80.00	Icing Detected
ENGINE-FAIL	%x01.00.00	Engine Deicing/Anticing Failed
AIRFRAME-FAIL	%x02.00.00	Airframe Deicing/Anticing Failed
INSEP-FAIL	%x04.00.00	Inertial Separator Failed
PITOT-FAIL	%x08.00.00	Pitot/Static Heat Failed
PROPHEAT-FAIL	%x10.00.00	Propeller Heat Failed
WINDHEAT-FAIL	%x20.00.00	Windshield Heat Failed
CARBHEAT-FAIL	%x40.00.00	Carb Heat Failed
CARBICEDET-FAIL	%x40.00.00.00	Carb Icing Detection Failed
ICEDET-FAIL	%x80.00.00.00	Icing Detection Failed

ICINGREQ - Requested Deicing State

• Parameter ID: %x00.00.b1
• Unit Usage: System/0=Aircraft
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using icing_flag dictionary (See .)

LDGGEAR - Landing Gear State

• Parameter ID: %x00.00.b2
• Unit Usage: Wheel/0=Aircraft
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using ldggear dictionary (See .)

, below, shows the values defined in the ldggear Dictionary. These options represent the Status of retractable landing gear. ldggear Dictionary

Name	Value	Definition
UNKNOWN	%x00.00	Gear Status Unknown
DOWN	%x00.01	Landing Gear Down
UP	%x80.00	Landing Gear Up
FLAG-FAILED	%x01.00.00	Landing Gear System is Failed

LDGGEARREQ - Landing Gear State

• Parameter ID: %x00.00.b3
• Unit Usage: Wheel/0=Aircraft
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using ldggear dictionary (See .)

CABINTEMP - Cabin Temperature in a zone

• Parameter ID: %x00.00.b4
• Unit Usage: Zone
• SubUnit Usage: Sensor Number /0=Average
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: C multiplied by 100.

CABINTEMPREQ - Requested Cabin Temperature in a zone

• Parameter ID: %x00.00.b5
• Unit Usage: Zone
• SubUnit Usage: Sensor Number /0=Average
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: C multiplied by 100.

CHKLIST - Checklist Item

• Parameter ID: %x00.00.b6
• Unit Usage: Checklist Number
• SubUnit Usage: Item Number /0=Title
• Format: CASMSG (See .)
• Range: parameter MUST NOT be sent with a range attribute.

WBRANGE - Weight and envelope per configuration

• Parameter ID: %x00.00.b7
• Unit Usage: None
• SubUnit Usage: None
• Format: WBRANGE (See .)
• Range: parameter MUST NOT be sent with a range attribute.

WBSTARM - Arm for given station

• Parameter ID: %x00.00.b8
• Unit Usage: Configuration
• SubUnit Usage: Station /0=total /1=total no fuel
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: IN multiplied by 1000.

WBSTMAXWEIGHT - Maximum weight at given station

• Parameter ID: %x00.00.b9
• Unit Usage: Configuration
• SubUnit Usage: Station /0=total /1=total no fuel
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 10.

WBSTFLAGS - Flags about given station

• Parameter ID: %x00.00.ba
• Unit Usage: Configuration
• SubUnit Usage: Station /0=total /1=total no fuel
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using station_flag dictionary (See .)

, below, shows the values defined in the station-flag Dictionary. These options represent the Weight and balance station types. station-flag Dictionary

Name	Value	Definition
FUEL	%x01	This station is a fuel tank. Its weight will be in XFS_PARAM_FUELLEVL
HULL	%x02	This station corresponds to the basic empty aircraft
FIXED	%x04	This station's weight is not adjustable
PASSENGER	%x08	This station corresponds to a passenger location
BAGGAGE	%x10	This station corresponds to a baggage location

WBSTWEIGHT - Actual weight at given station

• Parameter ID: %x00.00.bb
• Unit Usage: Configuration
• SubUnit Usage: Station /0=total /1=total no fuel
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 10.

TASEFF - Fuel Economy Relative to True Airspeed

• Parameter ID: %x00.00.bc
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: NMPLB multiplied by 100000.

GSEFF - Fuel Economy Relative to Groundspeed

• Parameter ID: %x00.00.bd
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: NMPLB multiplied by 100000.

TIMETOEMPTY - Time to Empty

• Parameter ID: %x00.00.be
• Unit Usage: Engine /0=Aircraft
• SubUnit Usage: 0 - smoothed, without reserve, 1 - smoothed, with reserve, 2 - without reserve, 3 - with reserve
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: S multiplied by 10.

DISTTOEMPTY - Distance to Empty

• Parameter ID: %x00.00.bf
• Unit Usage: Engine /0=Aircraft
• SubUnit Usage: 0 - smoothed, without reserve, 1 - smoothed, with reserve, 2 - without reserve, 3 - with reserve
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: NM multiplied by 100.

FLIGHTSTATE - State of Flight

• Parameter ID: %x00.00.c0
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using flight_state dictionary (See .)

, below, shows the values defined in the flight-state Dictionary. These options represent the Status of aircraft within flight profile. flight-state Dictionary

Name	Value	Definition
UNKNOWN	%d0	The state of the aircraft is not known
OFF	%d1	The aircraft is completely powered down
HIBERNATE	%d2	Minimal aircraft systems online not visible to the pilot
PREFLIGHT	%d3	Minimal aircraft systems for pilot interaction online
ENGINE-START	%d4	Engine(s) are preparing to start or are starting
PRETAXI	%d5	Engine(s) are started, awaiting pre-taxi items
TAXI	%d6	Aircraft is ready or in process of taxiing
RUNUP	%d7	Aircraft is ready for, or in process of performing runup
READY	%d8	Aircraft is ready for and positioned just short of takeoff
TAKEOFF	%d9	Aircraft is in process of performing takeoff
AFTER-TAKEOFF	%d10	Aircraft is airborne immediately but not yet configured for normal climb
DEPARTURE	%d11	Aircraft is on a standard instrument departure
CLIMB	%d12	Aircraft is climbing but not on an instrument departure
CRUISE	%d13	Aircraft is at final cruise
DESCENT	%d14	Aircraft is descending not on a standard arrival
ARRIVAL	%d15	Aircraft is on a standard arrival
APPROACH	%d16	Aircraft is on an instrument approach procedure
VISUAL	%d17	Aircraft is flying a visual traffic pattern
MISSED	%d18	Aircraft is executing a missed approach
SHUTDOWN	%d19	Aircraft engines are shutting down or have shut down
SECURE	%d20	Aircraft systems are shutting down or reconfiguring for preflight

UPDATESTATE - Status of any update

• Parameter ID: %x00.00.c1
• Unit Usage: None
• SubUnit Usage: None
• Format: UPDATE (See .)
• Range: parameter MUST NOT be sent with a range attribute.

TORQUEREQ - Requested Torque

• Parameter ID: %x00.00.c2
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: LBFT multiplied by 100.

STKPITCHFRCE - Stick Pitch Force applied by the pilot, positive value - push, negative value - pull

• Parameter ID: %x00.00.c3
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

STKROLLFRCE - Stick Roll Force applied by the pilot, positive value - roll right, negative value - roll left

• Parameter ID: %x00.00.c4
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

STKYAWFRCE - Pedal Yaw Force applied by the pilot, positive value - right rudder, negative value - left rudder

• Parameter ID: %x00.00.c5
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

APPITCHFRCE - Auto Pilot Pitch Force exerted on control surfaces, positive value - push, negative value - pull

• Parameter ID: %x00.00.c6
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

APROLLFRCE - Auto Pilot Roll Force exerted on control surfaces, positive value - roll right, negative value - roll left

• Parameter ID: %x00.00.c7
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

APYAWFRCE - Auto Pilot Yaw Force exerted on control surfaces, positive value - right rudder, negative value - left rudder

• Parameter ID: %x00.00.c8
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: LB multiplied by 100.

EFBPARAM - Up to 64-character, NULL terminated parameter value

• Parameter ID: %x00.00.c9
• Unit Usage: EFB ID
• SubUnit Usage: XFS_EFB_PARAM_*
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

OILPRESCOMP - Compensated Oil Pressure

• Parameter ID: %x00.00.ca
• Unit Usage: Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

MACHBUG - Target Mach

• Parameter ID: %x00.00.cb
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: MACH multiplied by 10000.

AOART - Angle of attack rate of change

• Parameter ID: %x00.00.cc
• Unit Usage: Source
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEG multiplied by 1000.

TASBUG - Target true airspeed

• Parameter ID: %x00.00.cd
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

GSBUG - Target groundspeed

• Parameter ID: %x00.00.ce
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

AOABUG - Bugged AOA

• Parameter ID: %x00.00.cf
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: DEG multiplied by 1000.

ECUTIME - ECU Hours

• Parameter ID: %x00.00.d1
• Unit Usage: Engine
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: HR multiplied by 1000.

DBASE - Active database information

• Parameter ID: %x00.00.d2
• Unit Usage: CPU ID
• SubUnit Usage: Process ID
• Format: DBASE (See .)
• Range: parameter MUST NOT be sent with a range attribute.

EAS - Equivalent Airspeed

• Parameter ID: %x00.00.d3
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: KT multiplied by 100.

EASRT - Equivalent Airspeed Rate of Change

• Parameter ID: %x00.00.d4
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KTPS multiplied by 100.

EASBUG - Target equivalent airspeed

• Parameter ID: %x00.00.d5
• Unit Usage: None
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: KT multiplied by 100.

POWERREQ - Requested power as percent of engine design maximum

• Parameter ID: %x00.00.d6
• Unit Usage: Motor/Engine
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: PCENT multiplied by 1000.

BRAKE - Wheel brake status

• Parameter ID: %x00.00.d7
• Unit Usage: Left=1,Right=2,No direction=0
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using brake dictionary (See .)

, below, shows the values defined in the brake Dictionary. These options represent the Status of wheel brakes. brake Dictionary

Name	Value	Definition
UNKNOWN	%x00.00	Brake Status Unknown
NONE	%x00.01	Brakes not pressed
MAX	%x80.00	Max Braking
PARK	%x01.00.00	Parking Brake Engaged
FLAG-FAILED	%x02.00.00	Brake System is Failed

BRAKEREQ - Amount of brake requested

• Parameter ID: %x00.00.d8
• Unit Usage: Left=1,Right=2,No direction=0
• SubUnit Usage: Specific
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Values interpreted using brake dictionary (See .)

NAVSQL - Communication Squelch (0-100)

• Parameter ID: %x00.00.d9
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Default Range: PERCENT (See .)
• Units: PCENT.

STATIONID - VOR Station ID decoded from Morse code

• Parameter ID: %x00.00.da
• Unit Usage: Radio ID
• SubUnit Usage: None
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

SVPARAM - Synthetic Vision parameters. Subunit is one of XFS_SV_PARAM_*

• Parameter ID: %x00.00.db
• Unit Usage: SYNVIS ID
• SubUnit Usage: XFS_SV_PARAM_*
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

FDCDISEL - Global selection of which CDI the flight director should track

• Parameter ID: %x00.00.dc
• Unit Usage: None
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.

BLOODOXY - Blood oxygen level of given seat occupant

• Parameter ID: %x00.00.dd
• Unit Usage: Seat position, 0=Lowest of all seats, 1=Pilot, 2=Copilot, etc
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Default Range: THOUPERCENT (See .)
• Units: PCENT multiplied by 1000.

PULSE - Pulse rate of given seat occupant

• Parameter ID: %x00.00.de
• Unit Usage: Seat position, 0=Worst of all seats (too low or high), 1=Pilot, 2=Copilot, etc
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: CPM multiplied by 1000.

BREATHS - Breathing rate of given seat occupant

• Parameter ID: %x00.00.df
• Unit Usage: Seat position, 0=Worst of all seats (too low or high), 1=Pilot, 2=Copilot, etc
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: CPM multiplied by 1000.

CARBMONOX - Carbon Monoxide levels detected by sensor

• Parameter ID: %x00.00.e0
• Unit Usage: Carbon Monoxide Sensor ID
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PPM multiplied by 100.

FLOWRATE - Oxygen flow rate

• Parameter ID: %x00.00.e1
• Unit Usage: Seat position, 0=Worst of all seats (too low or high), 1=Pilot, 2=Copilot, etc
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: LPM multiplied by 100.

TANKPRES - Oxygen tank pressure

• Parameter ID: %x00.00.e2
• Unit Usage: Tank number, 0=Worst of all tanks (too low or high), 1=Tank 1, 2=Tank 2, etc
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: PSI multiplied by 100.

RNAVVS - Vertical speed computed from RNAV

• Parameter ID: %x00.00.e3
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: FPM multiplied by 1.

COMPRESET - Selected COM Radio Preset (0=Non-preset frequency)

• Parameter ID: %x00.00.e4
• Unit Usage: Radio
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Values interpreted using preset dictionary (See .)

, below, shows the values defined in the preset Dictionary. These options represent the XSEDE Preset Frequency. preset Dictionary

Name	Value	Definition
MANUAL	%d0	Manual Tuning (no preset)
LAST	%xff.fe	Last selected frequency

COMNAME - Name of COM Radio or Preset Frequency

• Parameter ID: %x00.00.e5
• Unit Usage: Radio
• SubUnit Usage: 0=Radio /1+=Presets
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

NAVPRESET - Selected NAV Radio Preset (0=Non-preset frequency)

• Parameter ID: %x00.00.e6
• Unit Usage: Radio
• SubUnit Usage: None
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Values interpreted using preset dictionary (See .)

NAVNAME - Name of NAV Radio or Preset Frequency

• Parameter ID: %x00.00.e7
• Unit Usage: Radio
• SubUnit Usage: 0=Radio /1+=Presets
• Format: STRING (See .)
• Range: parameter MUST NOT be sent with a range attribute.

VNORTH - North component of velocity in true world coordinates

• Parameter ID: %x00.00.e8
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: KT multiplied by 100.

VEAST - East component of velocity in true world coordinates

• Parameter ID: %x00.00.e9
• Unit Usage: Source ID
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: KT multiplied by 100.

ENGPOWER - Current Engine Power

• Parameter ID: %x00.00.ea
• Unit Usage: Engine
• SubUnit Usage: 0=Shaft Power/1=Input Power Consumption/ 2+(even)= Component Shaft Power, 3+(odd)= Component Power Consumption
• Format: UINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: KW multiplied by 1000.

CHARGE - Measured remaining battery charge

• Parameter ID: %x00.00.eb
• Unit Usage: Battery ID/0=Sum of all
• SubUnit Usage: None
• Format: SINT (See .)
• Range: parameter MAY be sent with a range attribute.
• Units: AH multiplied by 1000.

CHARGETOT - Computed remaining charge

• Parameter ID: %x00.00.ec
• Unit Usage: Power System ID/0=Sum of all
• SubUnit Usage: 0 = current total, 1 = total at end of flight
• Format: SINT (See .)
• Range: parameter MUST NOT be sent with a range attribute.
• Units: AH multiplied by 1000.

Message Transport

Message Composition Application software on a node determines when information or raw data need to be sent onto the network. These transmissions are done as messages with raw data and messages with parameters. If subsequent information or raw data having the same message class, ID, and flags occur in a timely fashion, they MAY be coalesced into a single message. For each parameter to be sent, the common header (See ) the common data items MUST be populated. In addition, the Ident and Parameter Data MUST be populated with the corresponding data as per . The length in the common header MUST represent the actual length of the data, however, the parameter must be padded to a size that is a multiple of four octets. The message header MUST be populated with the corresponding data as per , the message number MUST be monotonically increasing with an arbitrary initial value, and then the length in the common header MUST be set equal to the sum of the padded parameter length values. Once this assembly process is complete, the message may be transmitted.

Message Signing Body text

Message Transmission and Reliability XSEDE is designed to be used with a broadcast UDP protocol however, there is no requirement to do so. Each endpoint MUST specify a listening address and port number with the default being 224.0.2.69 on port 20234. The actual address and port number are to be chosen by the system designer / installer for their particular needs. specifies IPv4 Multicast Address Assignments and SHOULD be followed. If the XSEDE message is successfully transmitted, no further action is required.

Message Reception & decoding XSEDE messages are received on the address and port that was configured in the prior section. Upon receiving a message, the src id and message number MUST be examined to ensure that this message is neither out of order nor a duplicate: Since lower level network tolopogies may affect the potential for packet delay and retransmission, each node MUST maintain a message look-back window size setting, default 4. Each node MUST also record of the last message number received from a node. If a subsequent message number is received out of order andis within the look back window, the message MUST be discarded. Otherwise, the message is a valid message. This arrangement accounts for both integer overflows and node restarts. Then, if the message is considered valid, each XSEDE node MUST examine each parameter in the XSEDE message to determine if it requires local processing. Local processing is beyond the scope of this document. Since there is no assured message delivery, all parameter interpretations MUST be idempotent to ensure multiple interpretations, or execution results in the same outcome.

Message Signing Since XSEDE operates on a closed network, message signing is not currently supported but may be added in the future.

Example Message Flows This section illustrates XSEDE features by example. The first example controls the radio.

Adjust radio This example sets the radio Set Radio frequency and squelch by broadcasting USERSEL parameters. If a node controlling the radio receives the request, it will respond with a result similar to the one shown afterwards.

Message Header

Message Header Format

src id:

UINT16; This value was set to 1001 decimal at installation time.

message number:

UINT16; 20 decimal for illustration purposes.

msg class:

UINT8; "OP" value 3 decimal.

message ID:

UINT8; FLIGHTDATA decimal 2

flags:

UINT16; LEVEL-A decimal 5; See .

tcid:

t-NONE; See .

len:

UINT16 ; 0x10, or decimal 16 bytes.

Frequency Message Header

Setting frequency to 122.750

Unit:

UINT16; decimal 2 to match the requested radio.

SubUnit:

UINT16; 0 to signify the radio itself.

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; COMFREQKHZ - Communication Frequency, value %x00.00.24 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 192 (OCTET): USERSEL. See .

Expire:

OCTET; Time to live. %x00 to not expire. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value would be 122750, 0x0001 df7e.

Squelch Message Header

Setting Squelch to 53

Unit:

UINT16; decimal 2 to match the requested radio.

SubUnit:

UINT16; 0 to signify the radio itself.

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; COMSQL - Communication Squelch (0-100), value %x00.00.28 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 192 (OCTET): USERSEL. See .

Expire:

OCTET; Time to live. %x00 to not expire. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value would be 53, 0x0000 0035.

Radio Status Report After the above parameters affect a change in the radio, or as part of the radio's regularly scheduled parameter broadcast, a message like the following will be transmitted. It has almost all the same values as the original message but would likely include other parameters as well. Only the changed parameters are described. The expire time is chosen at 2-3 times the scheduled broadcast time to ensure a fresh message is received within the valid time period should one be lost.

Radio Response Message

src id:

UINT16; This value is different than the prior message because this message is sent by the node controlling the radio. It was set to 1777 decimal at installation time.

message number:

UINT16; decimal 1255 for illustrative purposes. Note: this value is the current message sequence number for node 1777.

Confidence:

decimal 10 (OCTET): RAW / REPORTED in both parameters since this value is the actual reported value from the device. See .

Expire:

OCTET; Time to live. %xC9 to expire in about 15 seconds. See for encoding.

Deploy Landing Gear Example Landing Gear changes are different than radio changes in that it may take several seconds to affect a change. In this scenario, we will see a report by the node controlling the landing gear, followed by a parameter showing the user selecting a new value. Next, there will be a series of parameter broadcasts that showing the gear moving into position.

Initial Gear State Message

Initial gear state message

Above we see a periodic message indicating that each of the two landing gear are in an up position. If these were the only two landing gear, an alternative representation would be to send a single parameter with a a unit of zero to indicate all gear is in an up position. The attributes of the message are as follows:

src id:

UINT16; This value was set to 2222 decimal at installation time.

message number:

UINT16; 3400 decimal for illustration purposes.

msg class:

UINT8; "OP" value 3 decimal.

message ID:

UINT8; FLIGHTDATA decimal 2

flags:

UINT16; LEVEL-A decimal 5; See .

tcid:

t-NONE; See .

len:

UINT16 ; 0x20 bytes.

Parameter (First):

Unit:

UINT16; Decimal 1 for landing gear unit 1

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEAR - Landing Gear State, value %x00.00.b2 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 10 (OCTET): RAW. It is the value reported by the actuator. See .

Expire:

OCTET; Time to live. %x77 to expire in 2.9 seconds. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value is 0x8000.

Parameter (Second):

Unit:

UINT16; Decimal 2 for landing gear unit 2

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEAR - Landing Gear State, value %x00.00.b2 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 10 (OCTET): RAW. It is the value reported by the actuator. See .

Expire:

OCTET; Time to live. %x77 to expire in 2.9 seconds. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value is 0x8000.

Gear Position Request

Request Gear Position Down

Below we see an example message that could have been made by a landing gear button.

src id:

UINT16; This value was set to 1001 decimal at installation time.

message number:

UINT16; 2001 decimal for illustration purposes.

msg class:

UINT8; "OP" value 3 decimal.

message ID:

UINT8; FLIGHTDATA decimal 2

flags:

UINT16; LEVEL-A decimal 5; See .

tcid:

t-NONE; See .

len:

UINT16 ; 0x10 or 16 decimal bytes.

Parameter (Only):

Unit:

UINT16; Decimal 0 for the plane's landing gear.

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEARREQ - Landing Gear State Request, value %x00.00.b3 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 192 (OCTET): USERSEL. See .

Expire:

OCTET; Time to live. %x00 to not expire. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) 0x0001, down.

First Changed Gear State Message

First Changed Gear State Message

The above message was sent while the landing gear was in transit. It shows the position values for each gear to be different, but both in transit. The expiry is set to 0x77 and about 2.9 seconds as the sending node intends to send updates at least once per second. The longer time period accounting for potential losses.

src id:

UINT16; This value was set to 2222 decimal at installation time.

message number:

UINT16; 3401 decimal for illustration purposes.

msg class:

UINT8; "OP" value 3 decimal.

message ID:

UINT8; FLIGHTDATA decimal 2

flags:

UINT16; LEVEL-A decimal 5; See .

tcid:

t-NONE; See .

len:

UINT16 ; 0x20 bytes.

Parameter (First):

Unit:

UINT16; Decimal 1 for landing gear unit 1

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEAR - Landing Gear State, value %x00.00.b2 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 10 (OCTET): RAW. It is the value reported by the actuator. See .

Expire:

OCTET; Time to live. %x77 to expire in 2.9 seconds. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value is 0x3901, in transit .

Parameter (Second):

Unit:

UINT16; Decimal 2 for landing gear unit 2

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEAR - Landing Gear State, value %x00.00.b2 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 10 (OCTET): RAW. It is the value reported by the actuator. See .

Expire:

OCTET; Time to live. %x77 to expire in 2.9 seconds. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value is 0x4121, in transit.

Final Gear State Message

Final Gear State Message

The mesage above indicates that both landing gear are down (value 0x0001) and the message expiry has increased to 0xDB, or about 59 seconds. Since the gear are now in a static position, the node only intends to send updates every 20 seconds or so following the expire a message at about three times the sending frequency. In practice, to ensure delivery the long expiry should be introduced after at least one prior notification that it reached that state.

src id:

UINT16; This value was set to 2222 decimal at installation time.

message number:

UINT16; 3402 decimal for illustration purposes.

msg class:

UINT8; "OP" value 3 decimal.

message ID:

UINT8; FLIGHTDATA decimal 2

flags:

UINT16; LEVEL-A decimal 5; See .

tcid:

t-NONE; See .

len:

UINT16 ; 0x20 bytes.

Parameter (First):

Unit:

UINT16; Decimal 1 for landing gear unit 1

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEAR - Landing Gear State, value %x00.00.b2 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 10 (OCTET): RAW. It is the value reported by the actuator. See .

Expire:

OCTET; Time to live. %x77 to expire in 2.9 seconds. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value is 0x0001, down.

Parameter (Second):

Unit:

UINT16; Decimal 2 for landing gear unit 2

SubUnit:

UINT16; 0

Parameter Data Len:

11 bits; decimal 4.

Ident:

21 bits; LDGGEAR - Landing Gear State, value %x00.00.b2 See .

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 10 (OCTET): RAW. It is the value reported by the actuator. See .

Expire:

OCTET; Time to live. %x77 to expire in 2.9 seconds. See for encoding.

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

*(OCTET) value is 0x0001, down.

IANA Considerations This memo includes no request to IANA.

Security Considerations This document should not affect the security of the Internet. This protocol is currently designed to be deployed on an isolated private network. As such, message encryption, authenticity, and modification detection are not protocol priorities.

Interception Message Interception is not considered a significant threat for XSEDE because there is no private data in the system.

Impersonation and MITM Impersonation and Man in the Middle (MITM) are unlikely because normally the network is physically isolated and not routed to other networks. Strategies for signing messages are a future consideration.

Denial of Service Due to secure installation and physical isolation, Denial of Service is not a significant concern.

References Normative References International Organization for Standardization ISO/IEC 8859-1:1998 RTCA - Radio Technical Commission for Aeronautics Garmin International, Inc. Informative References