Data transmission system utilizing power line

Communications: electrical – Systems – Selsyn type

Patent

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Details

340310A, 3408255, 455 7, 455 14, H04B 354

Patent

active

045568650

ABSTRACT:
A data transmission system utilizing a power line comprises a transmitter (1), a receiver (2) and a repeater (5) coupled to a power line (3). Control data including a start code in the form of a high frequency signal is transmitted from the transmitter (1) in superposition on an alternating current of the commerical power supply using the power line. The repeater receives the control data transmitted from the transmitter, thereby to store the control data in a memory responsive to the start code. The control data is then read from the memory after the lapse of a predetermined period of time and is retransmitted to the receiver in a predetermined level. The receiver receives the control data, thereby to control an apparatus being controlled such as a relay, whereupon the same transmits in a return manner the data representing a control state thereof. The repeater receives the data and transmits the same to the transmitter.

REFERENCES:
patent: 3973087 (1976-08-01), Fong
patent: 4210901 (1980-07-01), Whyte
patent: 4250489 (1981-02-01), Dudash
patent: 4377804 (1983-03-01), Suzuki
patent: 4439763 (1984-03-01), Limb
patent: 4473816 (1984-09-01), Perkins
patent: 4475209 (1984-10-01), Udren

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