Abstract: An electrical control system for controlling one or more electrical devices includes a local control station and one or more remote control stations, each station including a transmitter and a receiver, the various stations being interconnected by optical fibers for transmission of information between the stations. The local control station continuously encodes the status of the controlled electrical devices, and optically transmits this information to the various remote stations. Also, the receiver of each remote station is provided with means for determining when a fault in the local to remote station link occurs and determines whether it is receiving valid control information from the local station. An alarm signal is produced when the remote station receiver fails to receive control signal information.