Arrangement for simultaneously interrogating a plurality of port

Details Arrangement for simultaneously interrogating a plurality of port Arrangement for simultaneously interrogating a plurality of port

1993-08-02

1995-12-19

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082554, 340928, 235380, G07D 700, G08G 100

Patent

active

054772150

ABSTRACT:
An updatable, interrogation system is provided for simultaneously interrogating a plurality of portable data cards. Operable over a plurality of radio frequencies, the interrogation system sequentially communicates with each portable data card as it comes within communication range on a first one of the plurality of radio frequencies 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 selects and moves with each card to a different one of the plurality of radio frequencies for completing a data transfer portion of the transaction. The interrogation system simultaneously completes each predetermined transaction of reading from and writing data to each one of the plurality of cards while communicating with each card on the respectively selected ones of the plurality of radio frequencies.

REFERENCES:
patent: 5086389 (1992-02-01), Hassett et al.
patent: 5131038 (1992-07-01), Puhl et al.
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: 5347263 (1994-09-01), Carroll et al.
William C. Y. Lee, Mobile Cellular Telecommunications Systems, 1989, pp. 8, 9, 25, and 26.

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