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AP-23
APPENDIX 3 DIGITAL INTERFACE
Digital Interface
Input sentence
ABK, ACK, ALR, CUR, DBT, DPT, DTM, GGA, GLL, GNS, HDT, MTW, MWV, RMC, THS, VBW,
VDM, VDO, VDR, VHW, VTG, ZDA
Output sentences
ABM, ACK, ALR, BBM, EVE, OSD, RSD, TLB, TTD, TTM, VSD
Data reception
Data is received in serial asynchronous form in accordance with the standard referenced in IEC
61162-2.
The following parameters are used:
Baud rate: 38,400 bps (HDT, THS, !AIVDM, !AIVDO, !AIABK, $AIALR). The baud rate of all other
sentences is 4800 bps
Data bits: 8 (D7 = 0), Parity: none, Stop bits: 1
Data Sentences
Input sentences
ABK - UAIS Addressed and binary broadcast acknowledgement
ACK - Acknowledge alarm
D0 D1 D2 D3 D4 D5 D6 D7
Start
bit
Stop
bit
Data bits
$**ABK,xxxxxxxxx,x,x.x,x,x,*hh<CR><LF>
1 2 3 4 5
1. MMSI of the addressed AIS unit (9 digits)
2. AIS channel of reception (No use)
3. Message ID (6, 8, 12, 14)
4. Message sequence number (0 - 9)
5. Type of acknowledgement (See below)
1 = message was broadcast (6 or 12), but not ACK by addressed AIS unit
2 = message could not be broadcast (quantity of encapsulated data exceeds five slots)
3 = requested broadcast of message (8, 14 or 15) has been successfully completed
4 = late reception of message (7 or 13) ACK that was addressed to this AIS unit (own ship
and referenced a valid transaction
5 = message has been read and acknowledged on a display unit.