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RFID group selection method

  • US 8,981,909 B2
  • Filed: 02/02/2005
  • Issued: 03/17/2015
  • Est. Priority Date: 02/06/2004
  • Status: Active Grant
First Claim
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1. A method of selecting or de-selecting one or more groups of transponders, using a selection process comprising one or more select commands from an interrogator, the one or more groups of transponders being within a field of interrogation, the method comprising:

  • transmitting from the interrogator a select command that includes selection or de-selection criteria of the one or more groups of transponders, whereby if a transponder meets selection or de-selection criteria in the select command, the transponder is selected or deselected while remaining in a first state; and

    transmitting from the interrogator at least one arbitration command, wherein the at least one arbitration command comprises a select parameter,wherein transponders within the one or more groups of transponders participate in an arbitration sequence, by transitioning from the first state to a second state to transmit a reply, in response to the at least one arbitration command and in an instance in which the transponder is selected and the select parameter is set to selected, andwherein transponders within the one or more groups of transponders participate in an arbitration sequence, by transitioning from the first state to a second state to transmit a reply, in response to the at least one arbitration command and in an instance in which the transponder is deselected and the set parameter is set to deselected.

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