transponders. If this applies, remove the heatshrink insulation and combine the bare end with the
AIS output signal wire in NMEA ch4 IN A of the multiplexer.
Connect the following devices directly to the multiplexer’s AIS port (NMEA ch4 IN), without the
white adaptation wire:
Nauticast class A transponders.
Furuno class A transponders.
Standard Horizon GX2100 VHF with built-in AIS
Smart Radio AIS receivers.
Use the white adaptation wire as described above for the following:
All class B AIS transponders based on the SRT board (Comar CSB200, True Heading AIS-Ctrx,
Westmarine re-branded class B transponder, Simrad, etc.)
We also supply a separate 1K5 resistor, which should be used for some AIS
receivers/transponders in the following ways:
For the Nasa AIS engine.
Connect the 1k5 resistor as a “pull-up” resistor between NMEA ch4 IN A and the +12V
connection to the multiplexer. The receiver and the multiplexer should share the same 12V power
supply. Pin 2 of the AIS engine output port should also be connected to NMEA ch4 IN A, i.e. the
resistor and the signal wire are combined in this terminal.
Connect signal ground (pin 5 of the 9-pin connector) to NMEA ch4 IN B.
Do not use the white adaptation wire.
Other incompatible AIS output signals
Sometimes it is necessary to connect the 1K5 resistor in-line with the white adaptation wire, i.e.
do not combine the white adaptation wire with the AIS output signal wire directly, but connect the
resistor to the end of the white wire and combine the other side of the resistor with the AIS signal
wire in NMEA ch4 IN A. This is sometimes necessary for connecting an RS232 port, including a
PC port (for AIS emulation). There are also a few known cases where the resistor had to be used
in this way for connecting a SR161 AIS receiver.
We will also explain with photos how to make the AIS connections on our website under “tips and
suggestions”.
Other NMEA Talkers (4800 baud):
NMEA Output A +
NMEA CH1 – CH3 IN A
NMEA Output B -
NMEA CH1 – CH3 IN B
Note:
If the Seatalk option has been installed and activated, CH1 is not available for NMEA input.
Leave open. (see
Seatalk
below).
Note 2:
Standard NMEA talkers with baud rate 4800 can only be connected to NMEA IN 1, 2 and
3. NMEA IN 4 accepts baud rate 38400 for connection of an AIS receiver.
Seatalk
If the Seatalk option has been installed in mux model AIS-C, a direct connection to the Raymarine
Seatalk bus can be made. The multiplexer will translate Seatalk GPS and instrument data
received from the ST-bus to NMEA sentences independently and include this in the multiplexer
output data stream. This option is intended for installations including a computer. If the C-series
chartplotter is switched off, instrument and ST GPS data will still be available to the computer in
NMEA format via RS232 or USB.
