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Arrangement for simultaneously interrogating a plurality of portable radio frequency communication devices

  • US 5,477,215 A
  • Filed: 08/02/1993
  • Issued: 12/19/1995
  • Est. Priority Date: 08/02/1993
  • Status: Expired due to Term
First Claim
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1. An interrogator for remotely interrogating a portable data card, the interrogator being operable over a plurality of radio frequencies and comprising:

  • means for communicating with the portable data card on a first one of the plurality of radio frequencies for determining a unique identification number associated with the data card;

    means for initiating a predetermined transaction responsive to receipt of the unique identification number by the interrogator;

    means for completing the predetermined transaction while communicating with the card on a second one of the plurality of radio frequencies, the interrogator reading data from and writing data to the card while operating over said second one of the plurality of radio frequencies; and

    means for transmitting a locking command and a subsequent lock reset command to the card, the locking command being registered in the card and being disabled by the lock reset command issued by the interrogator in response to the interrogator completing the predetermined transaction.

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