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The diagram has a double T connector with two 120-ohm terminators —
one at each end of the connector. It is easy to expand this network by re-
moving a terminator from one end of the double T connector, then insert-
ing a new T connector or extension cable between the double T connector
and terminator (See the NMEA 2000 network general information docu-
ment that came with your unit for more information).
NMEA 0183 Cable Connections
NMEA 0183 is a standard communications format for marine electronic
equipment. For example, an autopilot can connect to the NMEA inter-
face on the GlobalMap 540c and receive positioning information.
The GlobalMap 540c can exchange information with any device that
transmits or receives NMEA 0183 data.
See the following diagram for general wiring connections. Read your
other product’s owner’s manual for more wiring information.
NMEA 0183 Wiring
(Data cable)
To exchange NMEA 0183 data, the GlobalMap 540c has one NMEA
0183 version 2.0 communication port. Com port one (Com-1) can be
used to receive NMEA format GPS data. The com port can also trans-
mit NMEA format GPS data to another device.
The four wires for the com port are combined with the Power Supply cable
and NMEA 2000 Power cable to form the power/data cable (shown ear-
lier). Com-1 uses the yellow wire to transmit, the orange wire to receive
and the shield wire for signal ground. Your unit does not use the blue
wire.
Com-1 wiring to receive NMEA position information from some other
GPS receiver
Com-1 wiring to transmit NMEA position information
to another NMEA-compatible device.
Ground
To Other
Device
Com-1
To GlobalMap
540c
Y
ellow (Transmit)
NMEA Receive
Shield (Ground)
Orange (Receive)
NMEA Transmit
Shield (Ground)
Ground
Com-1
To GlobalMap
540c
To Other
GPS Receiver