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System and method for minimizing unwanted re-negotiation of a passive RFID tag

  • US 20040145454A1
  • Filed: 10/20/2003
  • Published: 07/29/2004
  • Est. Priority Date: 10/18/2002
  • Status: Active Grant
First Claim
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1. A method in a radio frequency identification (RFID) tag device for minimizing unintended re-negotiation of the tag device wherein the tag includes a confirmed read flag indicating whether the tag has been previously read, comprising the steps of:

  • (a) receiving a symbol from a reader when an operating state of the tag is a first state;

    (b) if the received symbol has a first logical value, transitioning the operating state to a second state; and

    (c) if the received symbol has a second logical value, performing the following steps;

    (1) evaluating the confirmed read flag, (2) if the confirmed read flag indicates the tag has been previously read, transitioning the operating state to a dormant state, and (3) if the confirmed read flag indicates that the tag has not been previously read, transitioning the operating state to the second state.

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