5.3 Troubleshooting

The user is expected to have working knowledge of the MODBUS protocol. For more information on MODBUS, visit: www.modbus.org.


WLTS Does Not Reply

The most common error is that MODBUS commands are being sent with an address which does not match the actual device address of the WLTS being used, in which case the WLTS will not reply. Try changing the MODBUS device address of the MODBUS command being sent.


The recorder receives badly formatted replies from the MODBUS network of WLTS

Check that all WLTS on the network have different and unique MODBUS device addresses. Otherwise there will be data bus collisions and scrambled data will be returned on replies to the recorder or MODBUS sensor.

Check if the WLTS sensor is properly connected to the Communication/Vented Cable.