Patent ID: 6352202
Filing Date: 2002-03-05
Classification: G06K

Abstract:
A contactless IC card control system comprising:reader/writer means for sending a request for identification information from a plurality of IC cards; IC card means for sending respective identification information in response to the request by said reader/writer means; means for assigning logical addresses to some of said IC cards and for selecting said some of said IC cards in response to the identification information sent by said IC card means; means for controlling said some of said IC cards; means for transmitting an address cancel requirement signal from the reader/writer means to one of said some of said IC cards; means for canceling a logical address assigned to said one of said some of said IC cards in response to said address cancel requirement signal; and means for reassigning the canceled logical address to an IC card among the plurality of IC cards to which a logical address has not yet been assigned, wherein said controlling means controls the IC card to which the logical address has been reassigned after said canceled logical address has been reassigned.