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Surveillance control apparatus for security system

  • US 4,658,243 A
  • Filed: 11/05/1984
  • Issued: 04/14/1987
  • Est. Priority Date: 11/08/1983
  • Status: Expired due to Term
First Claim
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1. A surveillance control system for a security system in which data signals are exchanged between a central station and a plurality of terminal devices, comprising:

  • the terminal devices being connected in parallel with each other to a common line extending from said central station;

    each terminal device having a self address detector means for detecting whether a received address signal coincides with a self address stored in the detector means unique for each respective terminal device, the detector means then creating an output;

    each terminal device having a display driver means for responding to said output from said self address detector means each and every time when address coincidence occurs, and a display unit driven by said display driver means;

    said central station having means for generating address signals corresponding to the addresses of the plurality of terminal devices; and

    said central station having means for storing an address of a terminal device which is not to be accessed and for selectively not addressing said terminal device when the other terminal devices are being addressed,whereby through observation of the display unit at the terminal device it can readily be determined whether the terminal device is being accessed by the central station.

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