Installing the i-Vu® Open Link
i-Vu Open Link Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide All rights reserved
12
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® Open 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® Open Link indicates a wiring or polarity problem.
Communicating through the Local Access port with a USB Link
Using a computer and a USB Link, you can communicate locally with the i-Vu® Open Link to download or to
troubleshoot.
CAUTIONS
• Maintain polarity when controllers share power.
• Failure to maintain polarity while using the USB Link on a computer that is grounded via its AC adapter may
damage the USB Link and the controller.
• If multiple controllers share power but polarity was not maintained when they were wired, the difference
between the controller's ground and the computer's AC power ground could damage the USB Link and the
controller. If you are not sure of the wiring polarity, use a USB isolator between the computer and the USB
Link. Purchase a USB isolator online from a third-party manufacturer. Plug the isolator into your computer's
USB port, and then plug the USB Link cable into the isolator.
PREREQUISITES
• For the i-Vu® or Field Assistant application to communicate with the controller, the controller must have been
downloaded with at least its driver.
• Laptop with USB port
• USB Link (Part #USB-L)
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