Lowrance electronic LCX-104C - Manual (Page 40)

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Communication Port Wiring Diagrams
Com-1 wiring to receive DGPS position information
from a DGPS receiver.
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.
Com-2 wiring to transmit NMEA position information
to another NMEA-compatible device.
Orange (Receive)
Shield (Ground)
Transmit
Ground
Com-1
To unit
To DGPS
Receiver
Yellow (Transmit) Receive
Orange (Receive) NMEA Transmit
To Other
GPS Receiver Shield (Ground) Ground
Com-1
To unit
Ground
To Other
Device
Com-1
To unit
Yellow (Transmit) NMEA Receive
Shield (Ground)
Shield (Ground) Ground
Com-2
To unit
Blue (Transmit) NMEA Receive To Other
Device