Data transmission system utilizing power line

Details Data transmission system utilizing power line Data transmission system utilizing power line

H - Electricity

04

B

340/79

H04B 3/54 (2006.01)

Patent

CA 1195745

ABSTRACT OF THE DISCLOSURE A data transmission system comprises a transmitter, a receiver and a repeater coupled to a power line. Control data including a start code in the form of a high frequency signal is transmitted from the transmitter over the power line in superposition on a commercial power supply alterna- ting current. The repeater stores the control data in a memory in response to the start code. The control data is then read from the memory after the lapse of a predeter- mined period of time and is retransmitted to the receiver at a predetermined level to counteract attenuation. The receiver receives the control data, thereby to control an apparatus to be controlled, such as a relay, whereupon the same transmits in a return manner data representing a control state thereof. The repeater receives the control state data and transmits the same to the transmitter.

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