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User Manual
Lorenz AIS 3000 RT
Power up messages
On power up the unit will report details of the firmware versions residing in the unit.
VHF data link messages (NMEA 0183 VDM)
Receipt of a VHF Data Link (VDL) message on either AIS radio channel causes a VDM message to be output via the data port.
Please see IEC 61193-2, Annex B for a list of messages.
VDM Message Format
!--VDM,x1,x2,x3,a,s--s,x*hh<CR><LF>
Where:
x x1 = Total number of sentences needed to transfer the message , 1 to 9
x x2 = Sentence number, 1 to 9
x x3 = Sequential message identifier, 0 to 9
x a = AIS Channel, "A" or "B"
x s - - s = Encapsulated ITU-R M.1371 radio message
x x = Number of fill-bits , 0 to 5
VDM Message Types
For example, the information contained in the s - - s portion of the VDM = Encapsulated ITU-R M.1371 radio message. Note
that messages 5 and 19 may be sent as multi part messages using the x1, x2 and x3 parameters for message sequence
control.
VDL Message number VDM Message description
AIS Target Display Information
1, 2, 3, 9,18, 21 position report
4 base station report
5* voyage related data
19* Class B – extended data
Safety message handling
12 addressed safety related
14 broadcast safety related
External Application handling
8 binary broadcast
System control
13 safety related ack (INFO)
15 interrogation (INFO)
17 DGNSS corrections (INFO)
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User Manual
Lorenz AIS 3000 RT
VDL Message number VDM Message description
20 data link management (INFO)
22 channel management (INFO)
23 Group assignment (INFO)
*Note that messages 5 and 19 may be sent as multi part messages.
VHF data link own vessel messages (NMEA 0183 VDO)
This message describes the own vessel message being sent.
VDO Message Format
!--VDO,x1,x2,x3,a,s--s,x*hh<CR><LF>
Where
x x1 = Total number of sentences needed to transfer the message , 1 to 9
x x2 = Sentence number, 1 to 9
x x3 = Sequential message identifier, 0 to 9
x a = AIS Channel, "A" or "B"
x s - - s = Encapsulated ITU-R M.1371 radio message 4
x x = Number of fill-bits , 0 to 5
VDO Message number VDO Message description
AIS Target Display Information
13 Safety Related Acknowledgement
14 Safety Related Broadcast message (default contents are MMSI and text "MAYDAY
MAYDAY"
18 Standard Class B position report (Includes MMSI, SOG, position accuracy, lat, long,
COG, true heading,)
19 Extended Class B position report (transmitted in responde to base station interrogation
only)
24A Class B “CS” Static data Part A (Includes MMSI and vessel name)
24B Class B “CS” Static data Part B (MMSI, ship type, cargo type, call sign, ship dimensions)
Regional Assignment Channel Assignment Message (NMEA 0183 ACA)
An AIS 3000 RT unit can receive regional channel management information in two ways: ITU-R M.1371 message 22 or a DSC
telecommand received on channel 70,
ACA 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>
Where
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