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Remote control system using power line of remote site

  • US 5,051,720 A
  • Filed: 11/13/1989
  • Issued: 09/24/1991
  • Est. Priority Date: 11/13/1989
  • Status: Expired due to Fees
First Claim
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1. A control system for controlling the application of power to one or more power-dependent units at a remote site in accordance with power control messages transmitted from a local site to the remote site over an intersite communications channel which couples the two sites where the inter-site communications channel also carries other messages, the system comprising:

  • a power line extending through the remote site for supplying power to the power-dependent units;

    master control means, located at the remote site and operatively coupled to the remote site power line, for transmitting power controlling signals through the remote site power line, the power controlling signals defining when and which of the one or more power-dependent units will receive power from the power line, the master control means having a master receiving port for receiving operation control commands which control operations of the master control means; and

    message routing means, located at the remote site and having first and second message routing channels both coupled to the inter-site communications channel, for receiving messages from the local site and selectively routing each received message onto one or the other of the first and second message routing channels,the first of the message routing channels including power-message relaying means, coupled to the master receiving port of the master control means, for generating in response to power control message received from the local site and for transmitting to the master control means the operation control commands which control the operations of the master control means,the second message routing channel being not coupled to the master receiving port of the master control means so that messages routed onto the second message routing channel cannot alter the operations of the master control means.

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