Connecting Cable Sections; Terminating Segments - Allen-Bradley ControlNet 1786-6.2.1 Planning And Installation Manual

3-18 Installing A ControlNet Cable System

Connecting Cable Sections

Terminating Segments

Publication 1786-6.2.1 - April 1998
Connect the cable sections to the tap's BNC connectors.
The taps on the ends of the segment have only one cable connector
attached to them. This leaves an open, or unterminated, end on the
segment. Signals transmitted along the cable will reflect off these
unterminated ends and interfere with transmission.
To eliminate signal reflections from the ends of the segment,
you must attach a 75Ω terminator to the first and last taps on the
segment. The terms "first" and "last" refer to the physical location of
the node along the trunk cable.
1. Connect one end of the trunk-cable section to one of the tap's
BNC connectors.
2. Install a 75Ω terminator onto the tap's other BNC connector.
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Repeat steps 1 and 2 at the other
end of the segment
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