Garmin GNS 480 Installation Manaul

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Contents

Appendix B - Serial Interface SpecificationsB-4 560-0982-01 Rev L GNS 480 (CNX80) Installation ManualB.1.2 Fuel/Air Data Computer InputThe fuel/air data input is used to input fuel flow and airdata computer information from the fuel/air datacomputer. The “FADC” selection supports both the Shadin “S” format and Shadin “Z” format data andare automatically accepted. The “FUEL” selection supports the PILATUS PC-12 Engine InstrumentSystem (EIS) Fuel transmission Data format.B.1.2.1 “S” Data FormatThe format of the fuel/air data computer input is as follows, which conforms to the Shadin “S” formatserial message. Definition of the input message data that the GNS 480 uses is included in Table B-3. Asample input message is illustrated in Figure B-2.Baud rate: ...............................................9600Data bits: ................................................8Stop bits: ................................................1Parity: .....................................................noneExpected input rate: ...............................approx. 1 secondMessage length: ......................................variable (512 character max.)The serial input message string is expected in the following format. ... .....................................................ASCII “start of text” character (STX = 02h)...............................................starts with an ASCII “S”, then an ID character, followedby the message data, a carriage return (CR = 0Dh), and aline feed (LF = 0Ah) See the following table. s = a signindicator (-,+,E,W). d = a decimal digit (0-9) ............................................the message checksum, same format as message ....................................................ASCII “end of text” character (ETX = 03h)Table B-3. Fuel/Air Data Message Data (S Format)ItemDesigMessageFormatMessageMnemonicFieldWidthMessage DescriptionSA ddd IAS 7 Indicated Air Speed in knotsSB ddd TAS 7 True Air Speed in knotsSC ddd MACH 7 Mach Speed in thousandthsSD sdddd PALT 9 Pressure Altitude in tens of feet, +/- sea levelSE sdddd DALT 9 Density Altitude in tens of feet, +/- sea levelSF sdd OAT 7 Outside Air Temp - or “Total”, in degrees CelsiusSG sdd TAT 7 True Air Temp - or “Static”, in degrees CelsiusSH ddd WDIR 7 Wind Direction, 0 to 359 degrees from true northSI ddd WSPD 7 Wind Speed in knotsSJ sdd TURN 7 Rate of Turn in +/- degrees/second, + is right, - is leftSK sddd VSPD 8 Vertical speed in tens of feet/minuteSL ddd HEAD 7 Heading, 0 to 359 degrees from true northSM dddd RFF 8 Right Engine Fuel Flow in tenths of gallons/hourSN ddddd RFU 9 Right Engine Fuel Used in tenths of gallonsSO dddd LFF 8 Left Engine Fuel Flow in tenths of gallons/hourSP ddddd LFU 9 Left Engine Fuel Used in tenths of gallonsSQ ddd ERR 7 Error Log / Reason Indicator: 001 = temp sensor error; 000 = no errorsSR 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 (discardingcarries) including all characters from the initial STX up to and including the line feed preceding thechecksum message.