Appendix 5: Digital Interface
AP-66
ALR- Set alarm state
Transmit of sentences:
Expected nominal interval of sentences: 30 s
$--ALR,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
BBM- UAIS Broadcast binary message
Transmit of sentences:
Expected nominal interval of sentences: on demand
!--BBM,x,x,x,x,xx,s--s,x*hh<CR><LF>
| | | | | | | |
| | | | | | | +--- 8
| | | | | | +------ 7
| | | | | +--------- 6
| | | | +------------- 5
| | | +---------------- 4
| | +------------------ 3
| +-------------------- 2
+---------------------- 1
1. Total number of sentences needed to transfer the message, 1 to 9
2. Message sentence number, 1 to 9
3. Sequential Message identifier, 0 to 9
4. AIS channel for broadcast of the radio message
5. VDL message number(8,14,19 or 21), see ITU-R M.1371
6. Binary data
7. Number of fill-bits, 0 to 5
8. Checksum
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