Testing Your Units

Cooper Bussmann BU-905U-L Wireless I/O Installation Manual

We recommend you bench test the complete system before installing a new system.

Configuration problems are easier to identify and fix when the units are next to each other.

The following table describes common problems and recommended solutions:

If your installation has …	You should check …	Cooper Bussmann recommends …
Poor radio channel	• The antenna installation.	• Higher performance antennas if the path is too long.
communications	• For radio interference on the same channel.	• Higher mounting points to overcome obstructions.
• TX LED flashes but no RX LED	• The radio path is adequate.	• Using an intermediate unit as a repeater.
• Output LEDs flash quickly
Red OK LED	• Power Supply voltage	• Supply should be between 9 and 30Vdc.
	• Analog loop supply current	• The analog loop supply is rated for 35mA max.
	• Module configuration	• Your module configuration may be invalid. Re-load
		or restore factory default configuration.

TX LED flashes but no RX LED (bench testing)

•Ensure the BU-905U-L-R is set to the same country and frequency band as the BU-905U-L-T

•Register the receiver with the transmitter. (Refer to the Quick Start Guide)

RX LED Flashes but no	• For a user-defined customized configuration,
outputs change	- check the configuration.
	• For default configuration, check the receiver is
	registered with the transmitter.

For support for other testing issues, please contact Cooper Bussmann.

•Check the configuration and reprogram the modules.

•Repeat the procedure to register the receiver with the transmitter.

3A1580Rev1.6

Cooper Bussmann BU-905U-L installation manual Testing Your Units