The indicator ring on the ROU is flashing red and green.
An alternating red and green blinking of the ROU indicator light(the light around the mirror) indicates that the ROU inoperative due an ICU busy or error condition.
A typical cause of this is that the Security Setting in IrisManager/Administrator is set to deactivate the remote units if connection to the IrisServer program can not be made.
Make sure that the IrisServer program is running and that the network connection between the Server and ICU is functioning.
You must reboot the ICU to re-activate the ROUs.