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Systems for power interruption detection

  • US 5,784,441 A
  • Filed: 11/03/1993
  • Issued: 07/21/1998
  • Est. Priority Date: 11/03/1993
  • Status: Expired due to Fees
First Claim
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1. A method of monitoring a condition at a remote location and for delivering via a communications network to a central control location notification of a change in the state of a condition at the remote location, the method comprising the steps of:

  • sensing at the remote changes in the state of the condition from a first state to a second state;

    responding during the second state to the sensed change in the condition to the second state, by delivering via the communications network to the central control location a signal representative of an identifying address (IA) assigned to the remote location;

    sensing for a return to the first state the condition at the remote location;

    responding to the condition returning to the first state by testing the communication network and generating an indication of line availability when the communications network is available for transmission of signals thereon;

    responding to an indication of line availability, selectively seizing a line on the communications network;

    generating communications network signals representative of a second IA;

    delivering to the central control location the second IA; and

    indicating the establishment of a completed call between the remote location and the central location by generating onto the communications network a preselected check signal.

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