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APPENDIX 4 DIGITAL INTERFACE
Input/output sentences
BWC, BWR, DBK, DBS, DBT, DPT, GGA, GLL, GNS, HDG, HDM, HDT, HTC, HTD, MTW, MWD,
MWV, RMB, RMC, ROT, RPM, RSA, THS, 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
D0
D1
Start
bit
Data sentences: Input/output
BWC - Bearing and distance to waypoint
$ **BWC,hhmmss.ss,llll.ll, a,IIIII.II,a,yyy.y,T, yyy.y,M,yyy.y,N,c--c,A,*hh<CR><LF>
1
1. UTC Time (unused)
2. Waypoint latitude (0.00000 to 9000.00000)
3. N/S
4. Waypoint longitude (0.00000 to 18000.00000)
5. E/W
6. Bearing, degrees true (unused)
7. Unit (unused)
8. Bearing, degrees magnetic (unused)
9. Unit (unused)
10. Distance, nautical miles (unused)
11. Unit (unused)
12. Waypoint ID (Max. 8 characters)
13. Mode Indicator (A=Autonomous D=Differential)
D2
D3
D4
D5
Data bits
2
3
4
5 6
7
8
D6
D7
Stop
bit
9 10 11 12 13
AP-5
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