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2800 Laura Lane • Middleton, WI 53562
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800.288.9383
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www.tcsbasys.com
Building Automation Systems
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Installation
Troubleshooting
The LEDs in the QWL2040 Panel ’s indicator panel on the front of the unit can be used to aid in troubleshooting and allow
the occupant to view the current operating status of the Panel.
Front indicator panel
Power LED Does Not Light Up
Be sure that the power supply module, included with the Panel, is plugged in to an outlet that has power. This is a 12V,
7A, tip positive power supply. If the power supply is plugged in to a live outlet and there is still no power, press the Reset
button located on the front panel until the CPU light is out to turn off the unit, and then press the Reset button once and
let go to restart the unit.
No Communications with Controllers on the Network
Make sure the baud rate selection for the Panel is set to match the baud rate of all the controllers on each port network
(the default communication speed of the serial bus is 9600). All controllers on the network must have a unique address,
excluding the reserved address ‘248’. All controllers on any given port must be of the same type, whether Modbus or
TCSbus. Also, each port must be configured for the appropriate type of communication.
Check the network wiring, making sure to follow polarity. Make sure the A wire goes to the A terminal in all devices, as
well as the wires that go to B and REF terminals.
No LAN Link to the Internet
Verify the network cable is connected correctly and make sure the LEDs next to the Ethernet jack are properly illuminated.
For example, a solid green LED at the RJ-45 LAN connector usually indicates that the QWL2040 Panel is either connected
or receiving a signal. If the green light is flashing, this is an indication of data being sent or received.
If there are no lights, the Panel may not be connected properly, or may not be receiving a signal from the network. If, after
checking the connections, the LED indicators are still off, the network adapter, port, or cable may be defective.
If there are lights but there is still no communication, this could be because the network communication is not set
properly or there is a bad firewall proxy setting. Contact your IT department for support, or contact TCS Technical Support
(800.288.9383, ext. 2) for assistance.
No Communication with RS485 Ports (COM 1 and 2), Ubiquity Time-out, or No Data
Verify each port on the Panel has the proper biasing resistors as specified by TCSbus and Modbus standards. Verify each
port is also optically isolated, which cleans up the signal and protects the unit from taking stray voltage off the RS485
lines.
A set of LEDs on each of the RS485 ports on the Panel allow the building occupant to view operational status of the serial
communication integrated board: