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Network Termination
You must install terminators at the ends of an NMEA 2000 backbone for it to function correctly. You can install
either two standard terminators or one female terminator and an in-line terminator on an NMEA 2000 network.
NOTE: You must not install more than two terminators on an NMEA 2000 network.
If the NMEA 2000 network is built using correct linear backbone construction, you should install one female
terminator and one male terminator on the sides of the final T-connectors on opposite ends of the backbone.
To power and NMEA 2000 devices
Female terminator
Backbone extension cable
Male terminator
If the final NMEA 2000 device on the NMEA 2000 network is separated from the backbone by a long length of
backbone extension cable, and the typical T-connector/drop cable/terminator combination is not feasible or is
too bulky for the area, you can use an in-line terminator instead of the final T-connector on the backbone. You
can connect the final device to the in-line terminator using the appropriate length of drop cable, or connect the
final device directly to the in-line terminator without using a drop cable.
An in-line terminator may be useful when connecting a wind sensor or other device at the top of a mast, for
example.
NOTE: An in-line terminator connects to the NMEA 2000 backbone using a male connector, and to the final
NMEA 2000 device using a female connector. Because of this, you can only use one in-line terminator on an
NMEA 2000 network, in place of a male terminator.
This end of the backbone uses a standard female terminator connected to T-connector for the last
device.
This end of the backbone uses an in-line terminator to connect to the last device. Note how using the in-
line terminator is used in place of the final T-connector and terminator.
Female terminator
To the final NMEA 2000 device on this side of the backbone
NMEA 2000 Network with Standard Terminators
NMEA 2000 Network with an In-line Terminator
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