Communications: electrical – Systems – Selsyn type
Patent
1980-10-24
1983-03-22
Swann, III, Glen R.
Communications: electrical
Systems
Selsyn type
340310CP, 340538, H04M 1104, H04Q 900
Patent
active
043778046
ABSTRACT:
A data transmission system utilizing a power line transmits a data signal of a plurality of bits in a serial fashion in synchronism with the cycles of the alternating current of a power supply. A start signal, channel section signal, control data signal and end signal are sequentially generated to transmit the control data to a selected receiver to control a desired output. Each cycle is divided into at least two phase sections, the one being used for a busy signal and the other being used for a data signal. The data transmission system includes a plurality of transmitters and a plurality of receivers coupled to the power line. Each of the transmitters comprises a receiving circuit for receiving a busy signal from other transmitters, a transmitting circuit for transmitting a data signal, a key input switch for operation, a selecting switch for selecting a channel which receives the transmitted data signal, and a memory for storing the key input signal. The transmitting circuit generates a data signal in response to the key input signal stored in the memory and to a non-busy signal. One embodiment of the transmission system of the present disclosure enables information to be transmitted over multiple-phase power lines.
REFERENCES:
patent: 3458657 (1969-07-01), Lester et al.
patent: 3482243 (1969-12-01), Buchsbaum
patent: 3525078 (1970-08-01), Baggott
patent: 3818466 (1974-06-01), Honda
patent: 4024528 (1977-05-01), Boggs et al.
patent: 4179624 (1979-12-01), Shindo et al.
Matsushita Electric & Works Ltd.
Swann III Glen R.
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