Arrangement for interrogating portable data communication devices
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United States of America Patent
Stats
-
Jul 30, 1996
Issued Date -
N/A
app pub date -
Jan 17, 1995
filing date -
Aug 2, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
An updatable, interrogation system is provided for interrogating portable data cards. The interrogation system sequentially communicates with each portable data card as it comes within communication range in a first time period for determining a unique identification number associated with each data card. Once the identification number for a card is obtained by the interrogation system, a predetermined transaction, such as deactivating an electronic barrier to entering a limited access area, for the holder of the identified card is initiated. The interrogation system then completes each predetermined transaction of reading from and writing data to each one of the cards while communicating in a second time period. The present invention also discloses an interrogation system where a locking command is transmitted to the portable data card, which is subsequently disabled by a lock reset command issued by the interrogator in response to completion of the predetermined transaction.
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