Contactless IC card communication system and related method
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United States of America Patent
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-
May 14, 2002
Grant Date -
N/A
app pub date -
Jan 12, 1999
filing date -
Jan 12, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reader/writer (RW) requires identification of anti-collision techniques used by IC cards (A, B, C, and D). The IC cards implement answers to the anti-collision technique identification requirement by the reader/writer at different timings respectively for respective IC cards among the IC cards which use different anti-collision techniques respectively. The reader/writer requires identifications of types of the IC cards in dependence upon the anti-collision techniques in response to the answers by the IC cards. The IC cards return identification data thereof in response to the card type identification requirements by the reader/writer for respective IC cards among the IC cards which use different anti-collision techniques respectively. The reader/writer identifies the types of the IC cards in response to the identification data of the respective IC cards.
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