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Pub. 988-0154-121
NMEA 2000 Network Expansion Cable
and 120-Ohm Terminators
Installation Instructions
This package contains a 25-foot (7.62 meters) NMEA 2000 Network
Expansion Cable, as well as two 120-ohm terminators. This product is
intended for use with NMEA 2000-ready (blue connector) Lowrance or
LEI products.
LEI NMEA 2000 Network Expansion Cable with two 120-ohm terminators
Expanding Your Lowrance NMEA 2000 Network
The included 25-foot cable has Y-adapters at both ends. Each cable has
one female connector and three male connectors. The male connectors
can attach to either a terminating resistor (either the 60-ohm terminator
packaged with your LGC-2000 or the two 120-ohm terminators included
in this package), or to a Lowrance or LEI product with a blue connector.
We designed these cables to allow you to configure your NMEA 2000
network to best suit your needs. Depending on the equipment you want
to attach to your network, you have several options available. In order
for your network to operate, there are a few rules you must follow.
Terminators
In order for the network to operate, you need 60-ohms of resistance at-
tached
somewhere
on the network cable. We use terminators (either one
60-ohm terminator or two 120-ohm terminators in parallel) to create
this resistance.
•
Never add terminators to an operational NMEA 2000 net-
work buss.
If it's working, it's already terminated.
•
If you are using two 120-ohm terminators, it's best to connect them
to sockets on the network as far from
each other
as possible.
There are several ways to set up your NMEA 2000 network, and we'll
explain them in the following pages. However, before we start, you need
to understand the necessity of terminators. In order for it to work, a
Two 120-ohm
terminators
Female
connector
