RC4 Commander is NOT compatible with RC4 LumenDim or W-DIM systems. For configuration of LumenDim devices, use RDM (remote device management).

RC4 Commander supports RC4Magic S2 and S3, RC4Magic-900 and RC5 EASS systems. 

You can read the IDs in any device by selecting the Public ID (ID3, 999) on the device and in RC4 Commander. Public always works, for all devices ever made.

And/or Try restoring factory defaults, which selects the default ID0.