190-01499-02
GTX 3X5 Transponder TSO Installation Manual
Rev. 9
Page A-2
Data Formats
A.1.4 Airdata Format 1 Sentence
The GTX 3X5 is capable of receiving the following message strings from the air data computer.
SHADIN Z FORMAT
<STX>
ZA012<CR><LF>
ZA (ASCII characters); 012 represents indicated air speed (knots)
ZB345<CR><LF>
ZB (ASCII characters); 345 represents true air speed (knots)
ZC678<CR><LF>
ZC (ASCII characters); 678 represents mach speed (thousandths)
ZD<+/->9012<CR><LF>
ZD (ASCII characters); sign; 9012 represents pressure altitude (tens of feet)
ZE<+/->3456<CR><LF>
ZE (ASCII characters); sign; 3456 represents density altitude (tens of feet)
ZF<+/->78<CR><LF>
ZF (ASCII characters); sign; 78 represents outside air temperature (Celsius)
ZG<+/->90<CR><LF>
ZG (ASCII characters); sign; 90 represents true air temperature (Celsius)
ZL234<CR><LF>
ZL (ASCII characters); 234 represents heading (degrees from north)
ZQ345<CR><LF>
ZQ (ASCII characters); 345 represents error log/reason indicator
ZR678<CR><LF>
ZR (ASCII characters); 678 represents checksum
<ETX>
Where:
<STX>
start-transmit character (0x02)
<CR>
carriage-return character (0x0D)
<LF>
line-feed character (0x0A)
<+/->
sign indicator (0x2B[+] or 0x2D[-])
<ETX>
end-transmit character (0x03)
NOTE
Checksum is calculated by adding each byte in the message (including all characters from <STX> up to
and including the error log/reason indicator), such that carries are discarded to give a one byte result.
The ASCII-coded decimal representation of that byte is given, ranging from 0 (0x30, 0x30, 0x30) to 255
(0x32, 0x35, 0x35).
