The 5103 series remote control panel consists of a special rack and variable 5103CP series control units. It is used to control the 5103 series modules. Each rack can carry at most four 5103CP Series Control Units in order to control four 5103 series modules. The 5103CP Series Control Unit displays the corresponding input signal presence on each channel and indicates the current output channel. It provides visual alarm for signal loss. The 5103CP Series Control Unit is equipped with an auto-lock toggle switch which is used to switch among Main, Backup and Auxiliary Inputs for output. It is powered by the modules under its control through CAT-5 cable. Cable length is available to 500 ft (about 150 m).