Communicating Through The Local Access Port With A Usb Link - Carrier OPN-OPT-OL Installation And Startup Manual

Communicating through the Local Access port with a USB Link

Communicating through the Local Access port with a USB Link
Using a computer and a USB Link, you can communicate locally with the controller 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® 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)
Using a USB Link
The USB Link driver is installed with an i-Vu® v5 or later system. But if needed, you can get the latest driver
1
from http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx. Install the driver
before you connect the USB Link to your computer.
Connect the laptop to the controller or sensor using the appropriate USB Link cable(s).
2
NOTE If using a USB isolator, plug the isolator into your computer's USB port, and then plug the USB Link
cable into the isolator.
Chilled Water System Optimizer v2
Installation and Start-up Guide
Connect to
U SB port
7 3/4 in.
18
Connect to
Local Access port
1 2 ft
USB Link
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