I would move the TX/RX unit to the DMX out 2 of the LE and then terminate that LE. If you are using the tx/rx daughter card on the LE that is being transmitted to, make sure that the remove for wireless jumper is removed. If you are using the standalone receiver, make sure that the remove for wireless is NOT removed. As also said, make sure that the transmitter is in transmit mode and that the transmitter and receiver are both configured to use the same channel. Also make sure that both units are using the correct firmware.