190-01499-02 GTX 3X5 Transponder TSO Installation ManualRev. 4 Page A-3SHADIN G FORMATGA012 GA (ASCII characters); 012 represents indicated air speed (knots)GB345 GB (ASCII characters); 345 represents true air speed (knots)GC678 GC (ASCII characters); 678 represents Mach speed (thousandths)GD<+/->9012 GD (ASCII characters); sign; 9012 represents pressure altitude (tens of feet)GE<+/->3456 GE (ASCII characters); sign; 3456 represents density altitude (tens of feet)GF<+/->78 GF (ASCII characters); sign; 78 represents outside air temperature (Celsius)GG<+/->90 GG (ASCII characters); sign; 90 represents true air temperature (Celsius)GK<+/->901 GK (ASCII characters); sign; 901 represents vertical speed (tens of ft/minute)GL234 GL (ASCII characters); 234 represents heading (degrees from north)GP89012 GP (ASCII characters); 89012 represents fuel used, left (or Single) (tenthsgallons)GR6789.0 GR (ASCII characters); 6789.0 represents fuel remaining (gallons) [1]Ga<+/->1234 Ga (ASCII characters); sign; 12.34 represents barometric corrected altitude(tens of feet)Gb56.78 Gb (ASCII characters); 56.78 represents current barometric pressure setting(inches Hg)G*901 G* (ASCII characters); 901 represents checksumWhere: start-transmit character (0x02) carriage-return character (0x0D) line-feed character (0x0A)<+/-> sign indicator (0x2B[+] or 0x2D[-]) end-transmit character (0x03)[1] Not available from Airdata ComputerNOTEChecksum is calculated by adding each byte in the message (including all characters from up to and including the error log/reason indicator), such that carries arediscarded to give a one byte result. The ASCII-coded decimal representation of that byte isgiven, ranging from 0 (0x30, 0x30, 0x30) to 255 (0x32, 0x35, 0x35).
