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  • US 5,450,080 A
  • Filed: 04/22/1992
  • Issued: 09/12/1995
  • Est. Priority Date: 04/22/1992
  • Status: Expired due to Term
First Claim
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1. A method of encoding the activation of a switch of a group of switches, the switches being designated by respective X,Y locations, and each of the switches having a first terminal designated by the X location thereof, and a second terminal designated by the Y location thereof, comprising the steps of:

  • activating a switch;

    energizing the first terminals of the switches to energize the second terminal of the activated switch;

    monitoring the second terminals of the switches to identify from the energized second terminal a Y location of the activated switch;

    energizing the second terminals of the switches designated by the identified Y location to energize the first terminal of the activated switch; and

    monitoring the first terminals of the switches to identify from the first terminal energized in the second terminals energizing step an X location of the activated switch.

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