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Burglar alarm system having reduced wiring

  • US 6,992,579 B2
  • Filed: 12/30/2003
  • Issued: 01/31/2006
  • Est. Priority Date: 01/03/2003
  • Status: Active Grant
First Claim
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1. An alarm system comprising:

  • an alarm controller,a remote input/output device,a single cable extending from the alarm controller to the remote input/output device, the cable comprising only two conductors providing power to the remote input/output device,a signal processor at the controller monitoring and processing voltage and current fluctuations in the conductors and controlling functions of the alarm system, anda mixer at the remote input/output device operative to affect current and voltage at the two conductor cable,wherein the mixer applies said predefined voltage and current levels to the two conductors, and wherein both the signal processor and mixer transmit and receive signals via the two-conductor cable.

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