Lowrance LGC-3000 Installation Instructions Manual page 9

WARNING:
Many devices on a powered NMEA 2000 network bus are
always on and constantly drawing power. This includes a
simple network composed only of a display unit and a GPS
module. You must connect NMEA power to a switched
power source so you can turn off the network when not in
use. Failure to connect to and use a power switch will drain
your boat battery, which could stop your boat's operation.
Connecting the LGC-3000 to a Display Unit
The simplest NMEA 2000 network is a GPS or sonar/GPS display unit
with the LGC-3000, one double-T connector, two 120 ohm terminators
and any extension cables needed to connect them. The diagram below
details how to set up that type of network.
120-ohm
terminator
Extension cable
LGC-3000
LGC-3000 and display unit as an expandable NMEA 2000 network.
The diagram above has a double T connector with two 120-ohm termina-
tors — 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 extension cable between the double T
connector and terminator (See the NMEA 200 network general informa-
tion document that came with your unit for more information).
Double T
Connector
Network port
on display unit
9
Extension cable
120-ohm
terminator