Appendix 5: Digital Interface
AP-64
$AIALR - Set alarm state
$AIALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
| | | | | |
| | | | | +----------------- 6
| | | | +----------------- 5
| | | +-------------------- 4
| | +---------------------- 3
| +------------------------- 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.
