Carrier I-Vu Link Installation Manual page 10

Mounting and wiring
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.
i-Vu® Link
Installation Guide
6
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