Lowrance LMS-332C Installation And Operation Instructions Manual page 44

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 re-
ceive and the shield wire for signal ground. Your unit does not use the
blue wire.
Com-1
To unit
Com-1 wiring to receive NMEA position information
Com-1
To unit
Com-1 wiring to transmit NMEA position information
Orange (Receive)
Shield (Ground)
from some other GPS receiver.
Yellow (Transmit)
Shield (Ground)
to another NMEA-compatible device.
NMEA Transmit
Ground
NMEA Receive
Ground
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To Other
GPS Receiver
To Other
Device