Em-Trak A100 - Page 64

Technical reference
Page 62
6.8.1 ABM - Addressed binary and safety related message
This sentence allows external applications to transmit binary and safety messages using the AIS transceiver
via AIS messages 6 and 12.
6.8.2 ACA - AIS regional channel assignment message
This sentence is used to both enter and obtain channel management information.
!--ABM,x,x,x,xxxxxxxxx,x,x.x,s--s,x*hh<CR><LF>
Field
number
Description
1 x = Total number of sentences needed to transfer the message
2 x = Sentence number
3 x = Sequential Message identifier
4 xxxxxxxxx = The MMSI of destination AIS transceiver for the ITU-R M.1371 message
5 x = AIS channel for broadcast of the radio message
6 x.x = ITU-R M.1371 message ID
7 s--s = Encapsulated data
8 x = Number of fill-bits, 0-5
$--ACA,x,llll.ll,a,yyyyy.yy,a,llll.ll,a,yyyyy.yy,a,x,xxxx,x,xxxx,x,x,x,a,x,hhmmss.ss*hh<CR><LF>
Field
number
Description
1 x = Sequence Number, 0 to 9
2 llll.ll,a = Region Northeast corner latitude - N/S
3 yyyyy.yy,a = Region Northeast corner longitude - E/W
4 llll.ll,a = Region Southwest corner latitude - N/S
5 yyyyy.yy,a = Region Southwest corner longitude - E/W
6 x = Transition Zone Size
7 xxxx = Channel A
8 x = Channel A bandwidth
9 xxxx = Channel B
10 x = Channel B bandwidth
11 x = Tx/Rx mode control
12 x = Power level control
13 a = Information source
14 x = In-Use Flag
15 hhmmss.ss = Time of “in-use” change