LD2103 V3.0 Page 16 of 33
SRT Marine
Instruction Manual
SRT-MTB
©
Class B Marine AIS
Serial Data Interface
Power Connection / Data Connection
There is a 15-way D-type male connector mounted under the transponder top cover. The standard data or power and data
cable assembly provided mates with this connector.
Power
12V DC (9.6-15.6V) is connected to the transponder power supply input via the cable assembly LD1873.
Data
A minimum keypad and display (MKD) unit, chart plotter or other display device may be connected to the TRANSAS AIS
CLASS B unit via the appropriate cable assembly. The default baud rate of the data link is 38.4kBaud with 8 data bits, one stop
bit and no parity. No handshaking is used.
The data interface conforms to IEC 61162-1.
VDM, VDO, ACA, ACS, ALR, TXT and ACK messages conform to NMEA 0183. Please refer to NMEA 0183 for full details of
these AIS messages.
Serial Port Input/Output
There are two serial ports, one presenting RS422 format and the other RS232 format. Data can be input from either or both
ports.
The serial port interface(s) output:
•
At power-up boot-loader and main application splash text screens including version numbers and memory status.
•
As a VHF Data Link Message (VDM) all incoming VHF Data Link (VDL) data received by the TRANSAS AIS CLASS B.
•
The VHF data link own vessel (VDO) messages sent by the TRANSAS AIS CLASS B over the VHF Data Link.
•
AIS regional channel assignment messages (ACA) received. These are derived from an incoming VHF Data Link
message (message 22) or a DSC message.
•
AIS channel management information source (ACS) messages.
•
Alarm messages (ALR, TXT).
The data interface will accept:
•
Personality programming messages
•
Alarm acknowledgement messages (ACK)
