Mounting and wiring
i-Vu® Link
CARRIER CORPORATION ©2019
Installation Guide
All rights reserved
6
NOTES
•
If you cannot determine the media type or connections of the third-party device, contact your third-party
representative.
•
Use the same polarity throughout the network segment.
•
Repeaters are required for more than 31 devices. See your third-party device manufacturer's
recommendations.
•
To reduce communication and data errors, terminate each end of an EIA-485 network with a resistor whose
value equals the network's characteristic impedance. Some third-party manufacturers provide a built-in
resistor that you enable or disable with a jumper. Make sure that only devices at the end of a network have
termination enabled.
EXAMPLE
If an EIA-485 2-wire network's characteristic impedance is 120 Ohms, terminate one pair by
placing a 120 Ohm resistor across the
Net+
and
NET-
connectors of the i-Vu® Link. Terminate the other pair
by placing a 120 Ohm resistor across the
+
and
-
connectors of the furthest third-party controller.
•
A solid receive light on the i-Vu® Link indicates a wiring or polarity problem.
