Appendix A Data Formats; Air Data Input Format - Garmin GTX 3X5 Series Installation Manual

Appendix A Data Formats

A.1 RS-232 Air Data Input Format ........................................................................................................................A-1
A.1.1 Electrical Interface ...................................................................................................................................A-1
A.1.2 Altitude Format 1 Sentence .....................................................................................................................A-1
A.1.3 Altitude Format 3 Sentence .....................................................................................................................A-1
A.1.4 Airdata Format 1 Sentence ......................................................................................................................A-2
A.2 ARINC 429 Input Formats ..............................................................................................................................A-5
A.3 ARINC 429 Output Formats ...........................................................................................................................A-9
A.1 RS-232 Air Data Input Format
A.1.1 Electrical Interface
The input signals are compatible with RS-232C. Data input at 9600 baud with a word length of 8 bits, one stop bit,
and no parity. One message is received per second.
A.1.2 Altitude Format 1 Sentence
The GTX 3X5 is capable of receiving the following 10-byte message from the altitude serializer.
Where:
ALT ASCII characters
<sp> space (0x20)
12345 altitude in feet
<CR> carriage return (0x0D)
A.1.3 Altitude Format 3 Sentence
The GTX 3X5 is capable of receiving the following 17-byte message from GAE modules, altitude serializers, and
altitude converters.
Where:
RMS ASCII characters
<sp> space (0x20)
<+/-> sign indicator (0x2B[+] or 0x2D[-])
12345 altitude in feet
T ASCII character
<+/-> sign indicator
12 sensor temperature
ul checksum of bytes 1 through 14 in hex ASCII (i.e., FA)
<CR> carriage return (0x0D)
NOTE
Checksum is calculated by adding each byte in the message (1 through 14).
190-01499-02
Rev. 9
ALT <sp>12345<CR>
RMS<sp><+/->12345T<+/->12ul<CR>
GTX 3X5 Transponder TSO Installation Manual
Data Formats
Page A-1