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Grounding Communication Cable Shield
When terminating the communication cable in the metal enclosure, ensure that the shield is insulated and
connected to the ground lug. Keyscan suggests Alpha PVC 10516 - #16 clear tubing or a comparable tubing to
insulate the shield. Do not connect the shield to GND on a communication terminal block.
Ground Lugs
The metal enclosure includes 1 ground lug pre-mounted near the top and 1 spare ground lug, which can be
mounted to one of the available ground lug studs. You can re-locate the ground lug inside the metal enclosure
to minimize the length of shield used.
Note
Keep all shield wires and cables away from the control board.
Cut View
KI-00110E-07-11
Keyscan Technical Guide (PC109x - 04.12)
Figure 7 – Communication Cable – Grounding the Shield
Metal Enclosure
Communication Cable
(RS-232)
Ground Lug
PC109x
Shield*
Alternate Ground Lug
Lug Stud
Illustration shows CB-485 using RS-232
communication as an example only.
Refer to the Communication section for
specific communication and ribbon
cable connections.
Communication Board
(CB-485)
*Insulate shield with PVC
tubing such as Alpha # 16
or comparable insulator
and connect to ground lug.
Knockout
Ground
Ground
Lug Stud
21
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