AP-5
APPENDIX 4 DIGITAL INTERFACE
Input/output sentences
BWC, BWR, DBK, DBS, DBT, DPT, GGA, GLL, GNS, HDG, HDM, HDT, HTC, HTD, MTW, MWV,
RMB, RMC, ROT, RPM, RSA, VBW, VHW, VLW, VTG, VWR, VWT, WPL, ZDA
Data reception
Data is received in serial asynchronous form in accordance with the standard referenced in IEC
61162-1.
The following parameters are used:
• Baud rate
Input: 4800 bps, IEC 61162-1-2
Output: Same as above. Baud rate fixed at 38400 bps for RD-50.
• Data bits: 8 (D7 = 0), Parity: none, Stop bits: 1
Data sentences: Input/output
BWC - Bearing and distance to waypoint
D0 D1 D2 D3 D4 D5 D6 D7
Start
bit
Stop
bit
Data bits
$--BWC, hhmmss.ss, llll.ll, a, yyyyy.yy, a, x.x, T, x.x, M, x.x, N, c--c, a*hh<CR><LF>
Checksum
Mode indicator
(see Note)
Waypoint ID
Distance, nautical miles
Bearing, degrees true
Waypoint longitude, E/W
Bearing, degrees magnetic
Waypoint latitude, N/S
UTC of observation
Note: Positioning system Mode indicator:
A=Autonomous, D=Differential, E=Estimated (dead reckoning),
M=Manual input, S=Simulator, N=Data not valid
The Mode indicator field shall not be a null field.
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