Furuno FCR-2107 Series Operator's Manual page 516

Appendix 5: Digital Interface
$AIALR - Set alarm state
$AIALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
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| |
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| +------------------------- 2
+--------------------------------- 1
1. Time of alarm condition change, UTC
2. Local alarm number (identifier)
3. Alarm condition (A=threshold exceeded, V=not exceeded)
4. Alarm's acknowledge state, A=acknowledged V=unacknowledged
5. Alarm's description text
6. Checksum
!AIVDM - VHF data-link message
Expected nominal interval between sentences: as specified by IMO for AIS transponder。
1, 2, 3, 4, 5, 9, 12, 14, 18, 19, 21 and 24 are used.
AP-64
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| | | +----------------- 6
| | +----------------- 5
| +-------------------- 4
+---------------------- 3