Lowrance electronic LCX-17M - Manual (Page 45)

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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 unit
NMEA Receive
Shield (Ground)
Orange (Receive) NMEA Transmit
Shield (Ground) Ground
Com-1
To unit
To Other
GPS Receiver
Yellow (Transmit)