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The diagram above has a double T connector with two 120-ohm (one
male and one female) terminators — one at each end of the connector.
It is easy to expand this network by removing a terminator from one
end of the double T connector, then inserting a new T connector or ex-
tension cable between the double T connector and terminator. Remem-
ber: The simplest NMEA 2000 network is a display unit with the LGC-
3000, one double-T connector and two 120 ohm terminators.
NMEA 0183 Cable Connections
NMEA is a standard communications format for marine electronic
equipment. For example, an autopilot can connect to the NMEA inter-
face on the GlobalMap and receive positioning information. The
GlobalMap can exchange information with any device that transmits or
receives NMEA 0183 data. See the following diagram for general wir-
ing connections. Read your other product’s owner’s manual for more
wiring information.
NMEA Wiring
(Data cable)
To exchange NMEA 0183, the GlobalMap 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 transmit 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 earlier). 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
5200c
Y
ellow (Transmit)
NMEA Receive
Shield (Ground)
Orange (Receive)
NMEA Transmit
Shield (Ground)
Ground
Com-1
To GlobalMap
5200c
To Other
GPS Receiver