2800 Laura Lane • Middleton, WI 53562 | 800.288.9383 | www.tcsbasys.com
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Installation
No Communication with RS-485 Ports (COM 1 and 2), Ubiquity Time-out, or No Data
Verify each port on the QD3041 has the proper biasing resistors. Verify each port is also optically isolated, which cleans
up the signal and protects the unit from taking stray voltage off the RS-485 lines.
A set of LEDs on each of the RS-485 ports in the QD3041 allow the building occupant to view operational status of the
serial communication integrated board:
•
GREEN – blinking indicates transmitting (Tx)
•
YELLOW – blinking indicates receiving (Rx)
If neither of these lights are functioning, there could be a bad connection, a bad cable, a bad ground, or a bad component.
This could also be a configuration issue. Contact TCS Technical Support (800-288-9383, ext. 2) for assistance.
