Equipment Installation Manual,
GDC31 Roll Steering Converter
APPENDIX A – AVIATION FORMAT
The GDC31 accepts data in the RS232 Aviation Format produced by most GPS panel mount receivers.
Various manufacturers refer to this data as RNAV, KING or MAPCOM. The following table contains the
minimum data set required by the GDC31. The GDC31 is designed to disregard additional data records
transmitted from the GPS.
The preferred baud rate is 9600 baud, however, the GDC31 will accept 2400, 4800 or 19200 baud. Insure
the GDC31 is configured for the correct baud rate (refer to "Serial Baud Rate Selection" located earlier in
this manual)
Aviation Data Format Description
<STX> ASCII Start of Transmission character
… other data
C284<cr> track; in degrees magnetic (ex: 284º)
D162<cr> ground speed; in knots (ex: 162 kt)
GR0050<cr> crosstrack; L (left) or R (right) in hundredths of
nautical miles (ex: Right 0.5nm)
I2855<cr> desired track; in tenths of degrees (ex: 285.5º)
… other data
<ETX> ASCII End of Transmission character
1. Each data field ends in a <cr> or <cr> <lf>
2. <cr> - ASCII carriage return character (0D hex)
3. <lf> - ASCII line feed character (0A hex)
1049-2510-01 G.doc
1049-2510-01
Rev G Page 30 of 47
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