Universal encrypted radio transmitter for multiple functions

  • US 5,731,756 A
  • Filed: 10/10/1996
  • Issued: 03/24/1998
  • Est. Priority Date: 10/10/1996
  • Status: Expired due to Term
First Claim
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1. A method of actuating at least one home security system remotely comprising the steps of:

  • (1) providing a transmitter with encryption logic to send an encrypted signal, providing a receiver adapted to identify an expected encrypted signal, said receiver being adapted to actuate a home security system said encryption logic sending signals that change sequentially, and thus are different on each actuation of said transmitter, said changing sequentially different signals being predictable to said receiver;

    (2) sending an encrypted signal from said transmitter;

    (3) receiving said signal at said receiver, and comparing said received signal to an expected signal; and

    (4) actuating said system if said received signal is determined to be as expected in step 3.

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