AIS-CTRX Class B AIS Transponder Manual
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 AIS-CTRX 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
AIS-CTRX.
• The VHF data link own vessel (VDO) messages sent by the AIS-CTRX 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)
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.
1.1E 26 LD2103
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