]> Avilution

Huntsville AL US markster@avilution.com

EMC Software

Jersey City NJ US edguy@eguy.org

General Internet Engineering Task Force avionics Ths 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 may be informational, e.g., indicating airspeed is 150 kts, or commands, such as an instruction that deploys the landing gear.

Introduction Historically, avionics equipment 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 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 Flight System Protocol, XFS, is such an IP-based protocol which provides a common means that facilitates communications between airborne equipment. It is an open protocol which operates using binary-encoded UDP packets sent on a broadcast address. This approach allows the avionics system to function as a collection of safety-critical microservices with XFS at the hub of the entire avionics system. XFS can flexibly drive multiple displays and unify all the aircraft's subsystems all at the control of the system integrator. In addition to the wire protocol described below, an xml schema is defined that allows additional message types and interactions. This format will be presented after the wire protocol is defined.

Basic Properties XFSp 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.

Drawbacks XFSp is a UDP-based protocol so packet delivery is not guaranteed. Application-level behavior is needed 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.

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 XFSp.

Node:

is a device or process that implements XFSp.

Parameter:

is the task specific payload contained in a message.

Attribute Format:

are the simple and structured datatypes 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 unit number, a locally configured value identifying an instance of equipment, e.g., radio #1 or engine #3.

Overview of XFS Protocol The eXtensible Flight System Protocol 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. XFSp messages are broadcast to every node on the network. XFSp message occur in three classes: Maintenance, Operational and Raw. Maintenance and Operational messages consist of a header followed by a series of parameters. Parameters represent commands or information. XFSp 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 XFSp messages go to all nodes and they simply discard things they don't care about. Raw XFSp 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 serial data. Each node in XFSp is assigned a source ID. These Source IDs MUST be unique within the XFSp 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 XFSp 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 XFSp 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 XFSp 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 XFSp header uses 12 bytes leaving 1460 bytes for parameters or 1440 bytes on an IPv6 network.

Message Format

Message Header

Message Header Format

XFSp 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 chosen value applies to all parameters in the message. 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. XFS transcoder ID values for future use. 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 XFS 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 Data Len:

12 bits; Parameter Data Length in octets. This value MUST reflect the usable length of the parameter data, however, the parameter MUST be padded to a length that is a multiple of four bytes to maintain proper word alignment.

Ident:

20 bits; XFS Parameter Identifier See section .

Format:

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

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 3 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	%d128	User selected value at runtime
HIGH	%d100	Confirmed known value
SYSSEL	%d80	System selected value at runtime
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	%d10	Raw, 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 and commands 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 five bits represent the the mantissa and the lower three bit represent the exponent. If the value of the Expire field is %xFF, the value is interpreted to mean "the parameter does not expire," otherwise the expiry time value is determined by the following formula: Expiration (milliseconds) = 3 * (M + 1) * 10^(E + 1).

Message Parameter Format

For example, an expiry value of %x13 gives a mantissa of 00010 and an exponent of 011 yielding a value of (3 * 3) * 10^4 ms or 90 seconds. Another example, %xF7 which gives a mantissa of 11110 and an exponent of 111 yielding a value of (3 * 31) * 10^(7+1) ms, 9.3 million seconds, or about 100 days. A final example, %x00 which gives a mantissa of 00000 and an exponent of 000 yielding a value of (3 * 1) * 10^(0+1) ms, or 30 milliseconds.

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 XFSp.

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 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 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 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 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 ISO-8559-1 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 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 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 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 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

, below, shows the values defined in the param-units Dictionary. These options represent Units for the encoding and translation of XFS 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 celcius 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 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 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 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 Types This section declares the initial set of XFSp 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 .)
• P-ALT - Pressure Altitude
  • Parameter ID: %x00.00.01
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• T-ALT - True Altitude
  • Parameter ID: %x00.00.02
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• IAS - Indicated Airspeed
  • Parameter ID: %x00.00.03
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• CAS - Calibrated Airspeed
  • Parameter ID: %x00.00.04
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• CASMSG - Crew Alerting System Message
  • Parameter ID: %x00.00.05
  • Unit Usage: CAS System ID
  • SubUnit Usage: None
  • Format: CASMSG (See .)
• THROTPOS - Throttle position
  • Parameter ID: %x00.00.06
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (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 .)
• BARO - Current barometric setting
  • Parameter ID: %x00.00.08
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• CLTPOS - Collective Position
  • Parameter ID: %x00.00.09
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• CLTPOSREQ - A/P Requested Collective Position
  • Parameter ID: %x00.00.0a
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SERVO (See .)
• MAGHDG - Magnetic Heading
  • Parameter ID: %x00.00.0b
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• MAGCRS - Magnetic Course (via RNAV)
  • Parameter ID: %x00.00.0c
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• TRUECRS - True Course (via RNAV)
  • Parameter ID: %x00.00.0d
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• MAGDTK - Desired Course (via RNAV)
  • Parameter ID: %x00.00.0e
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• TRUEDTK - Desired course (via RNAV)
  • Parameter ID: %x00.00.0f
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• LAT - Current position latitude
  • Parameter ID: %x00.00.10
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• LON - Current position longitude
  • Parameter ID: %x00.00.11
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• RNAVALT - Altitude measured by RNAV
  • Parameter ID: %x00.00.12
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• YAW - Yaw/Inclination as measured in G force
  • Parameter ID: %x00.00.15
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• RNAVHFOM - Horizontal Figure of Merit
  • Parameter ID: %x00.00.17
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• RNAVVFOM - Vertical Figure of Merit
  • Parameter ID: %x00.00.18
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• RNAVHPL - Horizontal Protection Level
  • Parameter ID: %x00.00.19
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• RNAVVPL - Vertical Protection Level
  • Parameter ID: %x00.00.1a
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• IASRT - Indicated Airspeed Rate of Change
  • Parameter ID: %x00.00.1b
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• SURFPOS - Position of arbitrary control surface
  • Parameter ID: %x00.00.1e
  • Unit Usage: Surface Type
  • SubUnit Usage: Surface Type Subassembly
  • Format: SINT (See .)
• SURFREQ - Requested control surface position
  • Parameter ID: %x00.00.1f
  • Unit Usage: Surface Type
  • SubUnit Usage: Surface Type Subassembly
  • Format: SINT (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 .)
• 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 .)
• WINDSPD - Wind Speed
  • Parameter ID: %x00.00.22
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• WINDBRG - True Bearing from which wind blows
  • Parameter ID: %x00.00.23
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• COMFREQKHZ - Communication Frequency
  • Parameter ID: %x00.00.24
  • Unit Usage: Radio ID
  • SubUnit Usage: 0=Radio /1+=Presets
  • Format: UINT (See .)
• NAVFREQKHZ - Navigation Frequency
  • Parameter ID: %x00.00.25
  • Unit Usage: Radio ID
  • SubUnit Usage: 0=Radio /1+=Presets
  • Format: UINT (See .)
• COMVOL - Communication Volume (0-100)
  • Parameter ID: %x00.00.26
  • Unit Usage: Radio ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• NAVVOL - Communication Volume (0-100)
  • Parameter ID: %x00.00.27
  • Unit Usage: Radio ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• COMSQL - Communication Squelch (0-100)
  • Parameter ID: %x00.00.28
  • Unit Usage: Radio ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• MUX - Selected multiplexer input or output
  • Parameter ID: %x00.29
  • Unit Usage: MUX ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• COMSTATE - COM radio state
  • Parameter ID: %x00.00.2b
  • Unit Usage: Radio ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• 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 .)
• ICSMODE - Intercom Mode
  • Parameter ID: %x00.00.2e
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• DATE - Date in YYYY-MM-DD format
  • Parameter ID: %x00.00.30
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: STRING (See .)
• GLOAD - Current Normal to Aircraft Loading
  • Parameter ID: %x00.00.31
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• RATEOFTURN - Turn Coordinator Rate Per Second
  • Parameter ID: %x00.00.32
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• GROUNDSPEED - Groundspeed
  • Parameter ID: %x00.00.33
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• VSPEED - Vertical speed
  • Parameter ID: %x00.00.34
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• XPDRRPS - XPDR Replies per second (normalized)
  • Parameter ID: %x00.00.36
  • Unit Usage: XPDR ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• 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 .)
• NAVOBS - NAV OBS Value
  • Parameter ID: %x00.00.39
  • Unit Usage: Radio/FMS ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• NAVBRG - Bearing to nav aid
  • Parameter ID: %x00.00.3a
  • Unit Usage: Radio/FMS ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• NAVCDI - Course Deviation (-1000 to 1000)
  • Parameter ID: %x00.00.3b
  • Unit Usage: Radio/FMS ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• NAVGSI - Glide Slope (-1000 to 1000)
  • Parameter ID: %x00.00.3c
  • Unit Usage: Radio/FMS ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• NAVFLAGS - Navigation Flags (see XFS_NAV_FLAG_*
  • Parameter ID: %x00.00.3d
  • Unit Usage: Radio/FMS ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• 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 .)
• ECBSTAT - ECB Status change or request, see xfs_ecb.h
  • Parameter ID: %x00.00.40
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: BUS (See .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• BUSSTAT - Status of Bus
  • Parameter ID: %x00.00.45
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: BUS (See .)
• TEMP - Arbitrary Temperature in a location
  • Parameter ID: %x00.00.46
  • Unit Usage: Location
  • SubUnit Usage: Sensor Number/0=Average
  • Format: SINT (See .)
• TAS - True Airspeed
  • Parameter ID: %x00.00.47
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• TAT - Total Air Temperature
  • Parameter ID: %x00.00.48
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• OAT - Outside Air Temperature accounting for compressibility
  • Parameter ID: %x00.00.49
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• D-ALT - Density Altitude
  • Parameter ID: %x00.00.4a
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• OILPRES - Oil Pressure
  • Parameter ID: %x00.00.4b
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• OILTEMP - Oil Temp
  • Parameter ID: %x00.00.4c
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• XFDFPS - XFD Display Frames Per Second (FPS)
  • Parameter ID: %x00.00.4d
  • Unit Usage: Display
  • SubUnit Usage: None
  • Format: UINT (See .)
• TIREPRES - Tire Pressure
  • Parameter ID: %x00.00.4e
  • Unit Usage: Bogey
  • SubUnit Usage: Tire
  • Format: SINT (See .)
• CHT - Cylinder Head Temperature
  • Parameter ID: %x00.00.4f
  • Unit Usage: Engine
  • SubUnit Usage: Cylinder/0=Max
  • Format: SINT (See .)
• EGT - Exhaust Gas Temperature
  • Parameter ID: %x00.00.50
  • Unit Usage: Engine
  • SubUnit Usage: Cylinder/0=Max
  • Format: SINT (See .)
• COOLTEMP - Coolant Temperature
  • Parameter ID: %x00.00.51
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• FUELFLOW - Fuel Flow
  • Parameter ID: %x00.00.52
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• FUELPRES - Fuel Pressure
  • Parameter ID: %x00.00.53
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• MANPRES - Manifold pressure
  • Parameter ID: %x00.00.55
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• ENGRPM - Engine RPM
  • Parameter ID: %x00.00.56
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• PROPRPM - Propeller RPM
  • Parameter ID: %x00.00.57
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• MACH - Mach
  • Parameter ID: %x00.00.58
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• IASBUG - Target indicated airspeed
  • Parameter ID: %x00.00.59
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• HDGBUG - Bugged Magnetic Heading
  • Parameter ID: %x00.00.5a
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• ALTBUG - Bugged Altitude
  • Parameter ID: %x00.00.5b
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• WAYPOINT - A way point in a flight plan, subunit is position in flightplan, beginning with 1 for 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 .)
• INSERT - Insert A way point in a flight plan, subunit is 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 .)
• DELETE - Delete A way point in a flight plan, subunit is 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 .)
• 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 .)
• NAVGPS - GPS Mode
  • Parameter ID: %x00.00.60
  • Unit Usage: NAV radio unit or FMS Unit Number
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• NAVXTK - Cross track error (negative is left)
  • Parameter ID: %x00.00.62
  • Unit Usage: FMS Unit Number
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• MANTEMP - Manifold temperature
  • Parameter ID: %x00.00.65
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• DIRECT - Go direct to a way point in a flight plan, subunit is 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 .)
• ACTIVATE - Activate leg terminating at way point in a flight plan, subunit is position in flightplan (SYSSEL/USERSEL ONLY). Label must match
  • Parameter ID: %x00.00.67
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: WAYPOINT (See .)
• 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 .)
• SERVOREQ - Requested servo position and state
  • Parameter ID: %x00.00.69
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SERVO (See .)
• SERVOPOS - Current servo actuator position
  • Parameter ID: %x00.00.6a
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• SONICHAT - Ultrasonic rangefinder height above terrain
  • Parameter ID: %x00.00.6b
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• LIDARHAT - LIDAR rangefinder height above terrain
  • Parameter ID: %x00.00.6c
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• RADARHAT - Radar rangefinder height above terrain
  • Parameter ID: %x00.00.6d
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• HAT - Computed height above terrain
  • Parameter ID: %x00.00.6e
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• STALLSPEED - Estimated real-time Stall speed
  • Parameter ID: %x00.00.71
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• TIMEMS - Time in milliseconds from midnight zulu time
  • Parameter ID: %x00.00.72
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• YTRIMPOS - Yaw Trim Position (negative left, 0 neutral, positive right)
  • Parameter ID: %x00.00.74
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• VSPEEDBUG - Vertical speed bug in fpm
  • Parameter ID: %x00.00.75
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• AOA - Angle of attack as an actual angle
  • Parameter ID: %x00.00.77
  • Unit Usage: Source
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• THROTREQ - Requested throttle position
  • Parameter ID: %x00.00.7d
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SERVO (See .)
• RPMREQ - Prop governor requested RPM
  • Parameter ID: %x00.00.7e
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• TACHTIME - Tachometer time, unit is engine
  • Parameter ID: %x00.00.7f
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• TOTTIME - Total aircraft time
  • Parameter ID: %x00.00.80
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• APPSTAT - Application Status / Requests
  • Parameter ID: %x00.00.00.81
  • Unit Usage: CPU ID
  • SubUnit Usage: Process ID
  • Format: APP (See .)
• 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 .)
• 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 .)
• COMSEL - Select COM Radio for Tuning
  • Parameter ID: %x00.00.84
  • Unit Usage: Display
  • SubUnit Usage: None
  • Format: UINT (See .)
• NAVSEL - Select NAV Radio for Tuning
  • Parameter ID: %x00.00.85
  • Unit Usage: Display
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• 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 .)
• 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 .)
• PITCHRT - Rate of change about A/C transverse axis (Q)
  • Parameter ID: %x00.00.89
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• YAWRT - Rate of change about A/C vertical axis (R)
  • Parameter ID: %x00.00.8a
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• STKYAW - Pedal Yaw Position (negative left, 0 neutral, positive right)
  • Parameter ID: %x00.00.8d
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• BATTTEMP - Battery Temp
  • Parameter ID: %x00.00.8e
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• MOTORTEMP - Motor Temp
  • Parameter ID: %x00.00.8f
  • Unit Usage: Motor
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• TORQUE - Torque
  • Parameter ID: %x00.00.91
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• TAILNUM - Up to 8-character, NULL terminated tail number
  • Parameter ID: %x00.00.92
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: STRING (See .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• FDMODEACT - Active Flight Director Modes
  • Parameter ID: %x00.00.99
  • Unit Usage: FD Number (0 for setting values)
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• ALTHOLDBUG - Altitude used by FD for altitude hold
  • Parameter ID: %x00.00.9b
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• APMODE - Autopilot Modes
  • Parameter ID: %x00.00.9c
  • Unit Usage: AP Number (0 for setting value)
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• PITCHBUG - Target pitch
  • Parameter ID: %x00.00.9e
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• PTSPEED - Power Turbine Speed (commonly N1)
  • Parameter ID: %x00.00.9f
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• GTSPEED - Gas Turbine Speed (commonly N2 or Ng)
  • Parameter ID: %x00.00.a0
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• TIT - Turbine Inlet Temperature
  • Parameter ID: %x00.00.a1
  • Unit Usage: Engine
  • SubUnit Usage: Turbo/0=Max
  • Format: SINT (See .)
• ITT - Inter-Turbine Temperature
  • Parameter ID: %x00.00.a2
  • Unit Usage: Engine
  • SubUnit Usage: Sensor /0=Average
  • Format: SINT (See .)
• 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 .)
• ENGSTATUS - Engine specific set of flags or values
  • Parameter ID: %x00.00.a4
  • Unit Usage: Motor/Engine
  • SubUnit Usage: Engine Specific
  • Format: UINT (See .)
• CABINALT - Cabin Equivalent Altitude
  • Parameter ID: %x00.00.a5
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• CABINALTREQ - Cabin Equivalent Altitude
  • Parameter ID: %x00.00.a6
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• DIFFPRES - Differential Pressure
  • Parameter ID: %x00.00.a7
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• DIFFPRESREQ - Requested Differential Pressure
  • Parameter ID: %x00.00.a8
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• ENGSTATE - Engine operating state
  • Parameter ID: %x00.00.aa
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• ENGSTATEREQ - Requested Engine operating state
  • Parameter ID: %x00.00.ab
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• BLEEDAIR - Bleed Air Level (Percent of Max)
  • Parameter ID: %x00.00.ac
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• BLEEDAIRREQ - Requested Bleed Air Level
  • Parameter ID: %x00.00.ad
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• LIGHTING - Lighting Color/Level
  • Parameter ID: %x00.00.ae
  • Unit Usage: System
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• LIGHTINGREQ - Requested Lighting Color/Level
  • Parameter ID: %x00.00.af
  • Unit Usage: System
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• ICING - Deicing State
  • Parameter ID: %x00.00.b0
  • Unit Usage: System/0=Aircraft
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• ICINGREQ - Requested Deicing State
  • Parameter ID: %x00.00.b1
  • Unit Usage: System/0=Aircraft
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• LDGGEAR - Landing Gear State
  • Parameter ID: %x00.00.b2
  • Unit Usage: Wheel/0=Aircraft
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• LDGGEARREQ - Landing Gear State
  • Parameter ID: %x00.00.b3
  • Unit Usage: Wheel/0=Aircraft
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• CABINTEMP - Cabin Temperature in a zone
  • Parameter ID: %x00.00.b4
  • Unit Usage: Zone
  • SubUnit Usage: Sensor Number /0=Average
  • Format: SINT (See .)
• CABINTEMPREQ - Requested Cabin Temperature in a zone
  • Parameter ID: %x00.00.b5
  • Unit Usage: Zone
  • SubUnit Usage: Sensor Number /0=Average
  • Format: SINT (See .)
• CHKLIST - Checklist Item
  • Parameter ID: %x00.00.b6
  • Unit Usage: Checklist Number
  • SubUnit Usage: Item Number /0=Title
  • Format: CASMSG (See .)
• WBRANGE - Weight and envelope per configuration
  • Parameter ID: %x00.00.b7
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: WBRANGE (See .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• TASEFF - Fuel Economy Relative to True Airspeed
  • Parameter ID: %x00.00.bc
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• GSEFF - Fuel Economy Relative to Groundspeed
  • Parameter ID: %x00.00.bd
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• FLIGHTSTATE - State of Flight
  • Parameter ID: %x00.00.c0
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UINT (See .)
• UPDATESTATE - Status of any update
  • Parameter ID: %x00.00.c1
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: UPDATE (See .)
• TORQUEREQ - Requested Torque
  • Parameter ID: %x00.00.c2
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• OILPRESCOMP - Compensated Oil Pressure
  • Parameter ID: %x00.00.ca
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• MACHBUG - Target Mach
  • Parameter ID: %x00.00.cb
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• AOART - Angle of attack rate of change
  • Parameter ID: %x00.00.cc
  • Unit Usage: Source
  • SubUnit Usage: None
  • Format: SINT (See .)
• TASBUG - Target true airspeed
  • Parameter ID: %x00.00.cd
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• GSBUG - Target groundspeed
  • Parameter ID: %x00.00.ce
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• AOABUG - Bugged AOA
  • Parameter ID: %x00.00.cf
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• ECUTIME - ECU Hours
  • Parameter ID: %x00.00.d1
  • Unit Usage: Engine
  • SubUnit Usage: None
  • Format: UINT (See .)
• DBASE - Active database information
  • Parameter ID: %x00.00.d2
  • Unit Usage: CPU ID
  • SubUnit Usage: Process ID
  • Format: DBASE (See .)
• EAS - Equivalent Airspeed
  • Parameter ID: %x00.00.d3
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• EASRT - Equivalent Airspeed Rate of Change
  • Parameter ID: %x00.00.d4
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• EASBUG - Target equivalent airspeed
  • Parameter ID: %x00.00.d5
  • Unit Usage: None
  • SubUnit Usage: None
  • Format: SINT (See .)
• POWERREQ - Requested power as percent of engine design maximum
  • Parameter ID: %x00.00.d6
  • Unit Usage: Motor/Engine
  • SubUnit Usage: None
  • Format: SINT (See .)
• BRAKE - Wheel brake status
  • Parameter ID: %x00.00.d7
  • Unit Usage: Left=1,Right=2,No direction=0
  • SubUnit Usage: Specific
  • Format: UINT (See .)
• 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 .)
• NAVSQL - Communication Squelch (0-100)
  • Parameter ID: %x00.00.d9
  • Unit Usage: Radio ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• STATIONID - VOR Station ID decoded from Morse code
  • Parameter ID: %x00.00.da
  • Unit Usage: Radio ID
  • SubUnit Usage: None
  • Format: STRING (See .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• 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 .)
• CARBMONOX - Carbon Monoxide levels detected by sensor
  • Parameter ID: %x00.00.e0
  • Unit Usage: Carbon Monoxide Sensor ID
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• 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 .)
• RNAVVS - Vertical speed computed from RNAV
  • Parameter ID: %x00.00.e3
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• COMPRESET - Selected COM Radio Preset (0=Non-preset frequency)
  • Parameter ID: %x00.00.e4
  • Unit Usage: Radio
  • SubUnit Usage: None
  • Format: UINT (See .)
• 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 .)
• NAVPRESET - Selected NAV Radio Preset (0=Non-preset frequency)
  • Parameter ID: %x00.00.e6
  • Unit Usage: Radio
  • SubUnit Usage: None
  • Format: UINT (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 .)
• VNORTH - North component of velocity in true world coordinates
  • Parameter ID: %x00.00.e8
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• VEAST - East component of velocity in true world coordinates
  • Parameter ID: %x00.00.e9
  • Unit Usage: Source ID
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)
• CHARGE - Measured remaining battery charge
  • Parameter ID: %x00.00.eb
  • Unit Usage: Battery ID/0=Sum of all
  • SubUnit Usage: None
  • Format: SINT (See .)
• 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 .)

Message Transport

Message Composition Application software on a node determines when information, commands, or raw data need to be sent onto the network. These transmissions are done as a message with raw data and message with parameters. If subsequent information or commands 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 XFSp 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 XFSp message is successfully transmitted, no further action is required.

Message Reception & decoding XFSp 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: the message number must be higher than the previous received message, if any. Messages that are received out of order MUST be discarded. Then, if the message is considered valid, each XFSp MUST must examine each parameter and XFSp message to determine if requires local processing. Local processing is beyond the scope of this document. Since there is no assured message delivery, all commands and information should be idempotent to ensure multiple interpretation, or execution results in the same outcome. Message numbers will overflow. Handling of this case is TODO.

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

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

Adjust radio This example sets the radio Set Radio frequency and squelch.

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 ; 0x28 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:

12 bits; decimal 4.

Ident:

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

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 128 (OCTET): USERSEL. See .

Expire:

OCTET; Time to live. %xFF 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:

12 bits; decimal 4.

Ident:

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

Format:

UINT (OCTET): decimal 2. See .

Confidence:

decimal 128 (OCTET): USERSEL. See .

Expire:

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

Pflags:

LEVEL-A (OCTET) decimal 5. See

Parameter Data:

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

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 XFSp 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 Informative References RTCA - Radio Technical Commission for Aeronautics Garmin International, Inc.