CSB200 Class B AIS
R2.0 39
VDO Message
Number
VDO Message Description
AIS Target Display Information
13 Safety Related Acknowledgement
18 Standard Class B position report (Includes MMSI, SOG,
position accuracy, lat, long, COG, true heading,)
24a Class B “CS” Static data Part A (Includes MMSI and vessel
name)
24b Class B “CS” Static data Part B (Includes MMSI, ship type,
cargo type, call sign, ship dimensions)
ACA Message Format
The CSB200 unit can receive regional channel management information
(ACA) in two ways: ITU-R M.1371 message 22 or a DSC telecommand
received on channel 70,
Message Format
$--ACA,x,llll.ll,a,yyyyy.yy,a,llll.ll,a1,y1y1y1y1y.y1y1,a2,x1,x2x2x2x2,
x3,x4x4x4x4, x5,x6,x7,a3,x8,hhmmss.ss*hh <CR><LF>
• x = Sequence Number , 0 to 9
• IIII, II, a = Region Northeast corner latitude – N/S
• yyyyy.yy,a1 = Region Northeast corner longitude – E/W
• llll.ll,a = Region Southwest corner latitude – N/S
• y1y1y1y1y1.y1y1,a2 = Region Southwest corner longitude –
E/W
• x1 = Transition Zone Size
• x2x2x2x2 = Channel A
• x3 = Channel A bandwidth
• x4x4x4x4 = Channel B
• x5 = Channel B bandwidth
• x6 = Tx/Rx mode control
CSB200 Class B AIS
R2.0 40
• x7 = Power level control
• a3 = Information source
• x8 = In-Use Flag
• hhmmss.ss = Time of "in-use" change
ACS Message Format
This sentence is used in conjunction with the ACA sentence and
identifies the originator of an ACA message.
$--ACS,x,xxxxxxxxx, hhmmss.ss,xx,xx,xxxx*hh <CR><LF>
• x = Sequence Number , 0 to 9
• xxxxxxxxx = MMSI of originator
• hhmmss.ss = UTC of receipt of channel management
information
• xx = UTC Day, 01 -31
• xx = UTC Month, 01 -12
• xxxx = UTC Year
ALR Message Format
Alarm message
$--ALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
• hhmmss.ss = Time of alarm (UTC)
• xxx = Unique alarm number
• A = Alarm condition
• A = Alarm acknowledge state
• c--c = Alarm description, text
Alarms descriptions presented are:
• AIS: TX malfunction
• AIS: Antenna VSWR exceeds limit
• AIS: Rx channel 1 malfunction
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