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Appendix 5: Digital Interface
AP-61
THS - True heading and status
Recipient of sentences:
Data cycle should be input with more than 40 Hz (HSC) or 20 Hz (normal speed).
VBW - Dual ground/water speed
Recipient of sentences:
Expected nominal interval of sentences: 5 s
Alarm generated if message not received: 22 s ± 2 s
$--VBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh<CR><LF>
| | | | | | | | | | |
| | | | | | | | | | +--- 11
| | | | | | | | | +----- 10
| | | | | | | | +-------- 9
| | | | | | | +----------- 8
| | | | | | +-------------- 7
| | | | | +----------------- 6
| | | | +-------------------- 5
| | | +------------------------ 4
| | +--------------------------- 3
| +------------------------------ 2
+---------------------------------- 1
1. Longitudial water speed, knots
2. Transverse water speed, knots
3. Status: water speed, A=data valid* V=data invalid**
4. Longitudial ground speed, knots
5. Transverse ground speed, knots
6. Status: ground speed, A=data valid *V=data invalid**
7. Stern transverse water speed, knots
8. Status: stern water speed, A=data valid V=data invalid
9. Stern transverse ground speed, knots
10. Status: stern ground speed, A=data valid V=data invalid
11. Checksum
*=Data shown in green
**=Data shown in blank