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Door/window contact system

  • US 8,988,225 B2
  • Filed: 12/04/2012
  • Issued: 03/24/2015
  • Est. Priority Date: 12/04/2012
  • Status: Active Grant
First Claim
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1. A position detector comprising:

  • a first element having an attachment feature, the first element emitting a unique, identifying radio frequency signal in response to a received, enabling radio frequency signal wherein the first element further comprises a standard off the shelf RFID tag and protocol; and

    a second element with a transmitter that emits the enabling radio frequency signal, and that emits a reporting radio frequency signal, wherein both signals are emitted by the same transmitter at the same frequency.

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