Arrangement for interrogating portable data communication device

Details Arrangement for interrogating portable data communication device Arrangement for interrogating portable data communication device

1995-01-17

1996-07-30

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

340928, 34082531, 34082534, 235382, 364401R, H04Q 700, G08G 100

Patent

active

055415830

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.

REFERENCES:
patent: 4384288 (1983-05-01), Walton
patent: 4977501 (1990-12-01), Lefevre
patent: 5131038 (1992-07-01), Puhl et al.
patent: 5144553 (1992-09-01), Hassett et al.
patent: 5168151 (1992-12-01), Nara
patent: 5196846 (1993-03-01), Brockelsby
patent: 5204675 (1993-04-01), Sekine
patent: 5241161 (1993-08-01), Zuta
patent: 5288978 (1994-02-01), Iijima
patent: 5317309 (1994-05-01), Vercellotti et al.

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