Patent ID: 8217764

Claim:
A subarea control system of electrical lighting separated by a demarcation repeater, comprises: a bus power supply connected to an electric supply an providing a DC voltage and limiting a current to a bi-phase digital information transmission bus; at least one demarcation repeater connected directly to the bus power supply via the bi-phase digital information transmission bus establishing a contact with an uplink bus and the demarcation repeater is connected directly to the electric supply and providing a bus power to a downlink bus; a system controller connected to the bi-phase digital information transmission bus, the system controller and the bi-phase digital information transmission bus form a transmission path, and a potential of a transmission information bus is controlled according to system instructions to broadcast the system instructions to the whole system; at least one subarea controller connected to the bi-phase digital information transmission bus, a potential of a information transmission cable is controlled according to subarea instructions; at least one group of lamp controllers respectively connected to the bi-phase digital information transmission bus to receive information instructions and to access the electric supply so the lamps are controlled according to the information instructions; the subarea controller and the lamp controllers form a subarea instruction transmission path whose boundary is the demarcation repeater, and the subarea instructions are valid on the subarea instruction transmission path.