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Security system having detector sensing and identification

  • US 4,524,349 A
  • Filed: 08/09/1982
  • Issued: 06/18/1985
  • Est. Priority Date: 08/09/1982
  • Status: Expired due to Term
First Claim
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1. A security system having detector sensing and identification by analog signal amplitude, comprising:

  • sensor loop means including a plurality of sensor loops for generating detector signals when detectors in said loops are actuated, each sensor loop including a plurality of detectors which are connected together and are coupled to a common loop output for applying an analog detector signal to said loop output when any of said detectors are actuated;

    identification means provided in each sensor loop with a separate detector identification means connected to each detector, for producing analog detection signals of different D.C. amplitudes for the detectors of each loop, each detection signal amplitude also being different than the sum of any combination of the other detection signal amplitudes produced by the other detectors of the loop; and

    analog to digital converter means having a plurality of loop inputs each connected to the common loop output of a different loop, for applying analog detection signals of D.C. amplitudes to the inputs of the converter means and for converting said analog detection signal to a digital detection signal which identifies the actuated detector;

    said converter means including a multiplexer means for selectively switching said loop inputs to the common input of a comparator circuit in said analog to digital converter means.

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