Garmin GNS 480, Инструкция по установке

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Appendix B - Serial Interface Specifications
B-4 560-0982-01 Rev L GNS 480 (CNX80) Installation Manual
B.1.2 Fuel/Air Data Computer Input
The fuel/air data input is used to input fuel flow and airdata computer information from the fuel/air data
computer. The “FADC” selection supports both the Shadin “S” format and Shadin “Z” format data and
are automatically accepted. The “FUEL” selection supports the PILATUS PC-12 Engine Instrument
System (EIS) Fuel transmission Data format.
B.1.2.1 “S” Data Format
The format of the fuel/air data computer input is as follows, which conforms to the Shadin “S” format
serial message. Definition of the input message data that the GNS 480 uses is included in Table B-3. A
sample input message is illustrated in Figure B-2.
Baud rate: ...............................................9600
Data bits: ................................................8
Stop bits: ................................................1
Parity: .....................................................none
Expected input rate: ...............................approx. 1 second
Message length: ......................................variable (512 character max.)
The serial input message string is expected in the following format.
<STX><message><message> ... <message><chksum><ETX>
<STX>.....................................................ASCII “start of text” character (STX = 02h)
<message>...............................................starts with an ASCII “S”, then an ID character, followed
by the message data, a carriage return (CR = 0Dh), and a
line feed (LF = 0Ah) See the following table. s = a sign
indicator (-,+,E,W). d = a decimal digit (0-9)
<checksum> ............................................the message checksum, same format as message
<ETX> ....................................................ASCII “end of text” character (ETX = 03h)
Table B-3. Fuel/Air Data Message Data (S Format)
Item
Desig
Message
Format Message
Mnemonic Field
Width
Message Description
SA ddd IAS 7 Indicated Air Speed in knots
SB ddd TAS 7 True Air Speed in knots
SC ddd MACH 7 Mach Speed in thousandths
SD sdddd PALT 9 Pressure Altitude in tens of feet, +/- sea level
SE sdddd DALT 9 Density Altitude in tens of feet, +/- sea level
SF sdd OAT 7 Outside Air Temp - or “Total”, in degrees Celsius
SG sdd TAT 7 True Air Temp - or “Static”, in degrees Celsius
SH ddd WDIR 7 Wind Direction, 0 to 359 degrees from true north
SI ddd WSPD 7 Wind Speed in knots
SJ sdd TURN 7 Rate of Turn in +/- degrees/second, + is right, - is left
SK sddd VSPD 8 Vertical speed in tens of feet/minute
SL ddd HEAD 7 Heading, 0 to 359 degrees from true north
SM dddd RFF 8 Right Engine Fuel Flow in tenths of gallons/hour
SN ddddd RFU 9 Right Engine Fuel Used in tenths of gallons
SO dddd LFF 8 Left Engine Fuel Flow in tenths of gallons/hour
SP ddddd LFU 9 Left Engine Fuel Used in tenths of gallons
SQ ddd ERR 7 Error Log / Reason Indicator: 001 = temp sensor error; 000 = no errors
SR ddddd REM 10 Fuel remaining (0-9999.9 in gallons)
S* ddd CKSUM 7 Checksum of all characters preceding this record. The checksum is a one byte checksum (discarding
carries) including all characters from the initial STX up to and including the line feed preceding the
checksum message.