H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/79
H04B 3/54 (2006.01) H02J 13/00 (2006.01)
Patent
CA 1145433
ABSTRACT OF THE DISCLOSURE 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 selection signal, control data signal and end signal are sequentially generated to transmit 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 transmitter, 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. Some embodiments of the invention enable information to be transmitted over multiple-phase power lines.
363343
G. Ronald Bell & Associates
Matsushita Electric Works Ltd.
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