Lowrance electronic Electronic Speed Sensor EP-70R - Manual (Page 6)

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NMEA 2000 network node located at the end of a NMEA 2000 backbone.
NOTE:
If you have a double T Connector on your network that is not
attached to a device, you must cap the unused connector with a
NMEA 2000 cap. This will protect the pin connectors from
corrosion. The NMEA 2000 cap looks like a terminator, but has
"Cap" stamped into the connector housing.
All T connectors on your network probably will be connected to a device.
If you want to add another node to a working network, add another T
connector. T connectors may be purchased from LEI (ordering
information appears on the back page of this booklet). If you are adding a
Lowrance or LEI NMEA 2000 sensor, it will come with a T connector.
Adding a Network Node
You can add a node to any existing connection, anywhere along the
network backbone. This connection could be between a T connector and a
terminator, between two T connectors, between a T connector and a
backbone extension cable or between two extension cables. Wherever you
want to add the new node, separate the sockets of the existing connection
and install the T connector between them.
If you want to add a node at the end of the backbone (network bus)
remove the terminator from the last connector, like the figure above.
Install the new T connector and attach the terminator to the side of the
connector.
Backbone cable
(to rest of bus)
Cable from
sensor or
display unit
Terminator at
the end of the
backbone (bus)
Double T
connector
Cap for unused
connector