Data transmission system utilizing power line
First Claim
1. A data transmission system utilizing a power line including first and second communicating means coupled to said power line at spaced apart points, repeater means connected to said power line between said first and second communicating means for transmitting through said repeater means control data including a plurality of bits in the form of a high frequency signal superimposed on an alternating current of a power supply supplied over said power line between said first and second communicating means,said first communicating means includingfirst transmitting means for transmitting saidcontrol data to said second communicating means, and first receiving means for receiving said controldata transmitted from said second communicating means;
- said second communicating means includingsecond receiving means, operatively connectable to a load having control states, for receiving said control data transmitted from said first communicating means and for controlling the load in accordance with said control data, andsecond transmitting means for transmitting to said first communicating means control state data representing the control of the load;
said repeater means includingstoring means for storing the control data being transmitted between said first and second communicating means,high frequency signal blocking means coupled to said power line for blocking passage of said high frequency signal by separating the first communicating means side of said power line from the second communicating side of said power line for high frequency signals, while allowing for passage of said alternating current,storage control means, for determining on which side of said high frequency signal blocking means control data transmitted from one of said first and said second communicating means along the power line is being transmitted, for providing determination result data and for making said storing means store said control data transmitted from one of said first and second communicating means coupled to said power line spaced apart from said high frequency blocking means together with the determination result data, andmeans for reading said control data and the determination result data stored in said storing means after a predetermined period of time and for transmitting said control data through the other side of the power line connected to said high frequency signal blocking means in response to the determination result.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
2 Claims
-
1. A data transmission system utilizing a power line including first and second communicating means coupled to said power line at spaced apart points, repeater means connected to said power line between said first and second communicating means for transmitting through said repeater means control data including a plurality of bits in the form of a high frequency signal superimposed on an alternating current of a power supply supplied over said power line between said first and second communicating means,
said first communicating means including first transmitting means for transmitting said control data to said second communicating means, and first receiving means for receiving said control data transmitted from said second communicating means; -
said second communicating means including second receiving means, operatively connectable to a load having control states, for receiving said control data transmitted from said first communicating means and for controlling the load in accordance with said control data, and second transmitting means for transmitting to said first communicating means control state data representing the control of the load; said repeater means including storing means for storing the control data being transmitted between said first and second communicating means, high frequency signal blocking means coupled to said power line for blocking passage of said high frequency signal by separating the first communicating means side of said power line from the second communicating side of said power line for high frequency signals, while allowing for passage of said alternating current, storage control means, for determining on which side of said high frequency signal blocking means control data transmitted from one of said first and said second communicating means along the power line is being transmitted, for providing determination result data and for making said storing means store said control data transmitted from one of said first and second communicating means coupled to said power line spaced apart from said high frequency blocking means together with the determination result data, and means for reading said control data and the determination result data stored in said storing means after a predetermined period of time and for transmitting said control data through the other side of the power line connected to said high frequency signal blocking means in response to the determination result. - View Dependent Claims (2)
-
Specification