AP-17
APPENDIX 3 DIGITAL INTERFACE
Digital Interface
Input sentences:
ABK, ACN, ALC, ALF, ALR, ARC, CUR, DBT, DPT, DTM, ETL, GGA, GLL, GNS, HBT, HDT, HTD,
MTW, MWV, NRX, OSD, PRC, RMC, ROR, ROT, RPM, RRT, RSA, RSD, THS, TRC, TRD, TTD,
TTM, VBW, VDM, VDO, VDR, VSD, VHW, VTG, XDR, ZDA
Output sentences:
ABM, ACK, ACN, ALC, ALF, ARC, BBM, DDC, EVE, HBT, HTC, OSD, RRT, VBW, VDR, VSD,
XTE
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
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.
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