Connections:
Seatalk signal wire (yellow)
ST Yellow Signal
Seatalk shield (-12V)
ST Shld –
S12V (red)
ST Red +
Note: If the Seatalk option has been ordered, it has been enabled in our workshop. This means
that CH1 NMEA IN cannot be used for a NMEA talker connection.
To disable Seatalk and free up CH1 for NMEA, the setup procedure has to be executed.
NMEA Listeners (4800 baud):
Note that the 4800 bps multiplexer output is the baudrate conversion output and by default not
the combined output of the connected NMEA talkers. Also refer to “Baudrate Conversion options”
below.
NMEA Input A +
Grey connector top screw (NMEA OUT + 4800 baud)
NMEA Input B -
Grey connector bottom screw (NMEA OUT – 4800 baud)
A maximum of 4 NMEA listeners can be connected in parallel to this output, provided that they
comply with the NMEA standard. The output is a differential signal (RS422, NMEA standard). The
top screw terminal is A, the bottom B.
C- or E-series:
Assuming Raymarine NMEA cable R08004, connect as follows:
(NMEA baudrate in C- or E- series has to be set to 38400 - AIS)
NMEA (Yellow)
As indicated on mux
NMEA Output - (Brown)
As indicated on mux
NMEA Input + (White)
As indicated on mux
NMEA Input - (Green)
As indicated on mux
Note: This is the standard wiring method. The baudrate of the NMEA output from the C- or E-
series is converted by the mux from 38400 to 4800 bps, allowing connection of standard NMEA
listeners to the 4800 bps output on the mux (grey connector) to receive NMEA data from the C- or
E-series. There are alternative wiring methods whereby instead of the C-/E-series NMEA output,
the computer output is converted to 4800 bps, e.g. to control the auto pilot in track-mode or to be
able to load waypoints/routes from the computer to the C-/E-series chartplotter.
RS232 output
The output of multiplexer model AIS-C can also be connected to a serial computer port.
Assuming a 9-pin D-sub connector, mux terminal TxD should be connected to pin 2 of the
computer connector and the G-terminal (labelled “Brown C-series NMEA out –“) to pin 5. If the
standard wiring method is used, this means that the brown wire of the the C-/E- series cable and
the pin 5 wire of the RS232 port are combined in the same terminal
USB
The USB connection is optional and is only required if the output of the mux AIS-C also needs to
be connected to a computer. Follow the instructions in the standard multiplexer manual for USB
driver installation.
Alternative use of the baudrate conversion feature
In the standard connection method, described above, the baud rate of NMEA data received from
the C- or E-series chart plotter at 38400 bps is converted to 4800bps. If a computer is part of the
integrated system, the baudrate conversion feature may be used in a different way, in particular if
the multiplexer Seatalk-NMEA conversion option has been installed. In the latter case, data from
the Seatalk network, including GPS data, is already converted to NMEA by the multiplexer and
the system is not dependent on NMEA data output by the chart plotter.
