Method and system for identifying and communicating with a plurality of contactless IC cards
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 16, 1997
Grant Date -
N/A
app pub date -
Oct 6, 1995
filing date -
Oct 28, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Even when a plurality of cards have entered an communication area, the cards within the communication area may be accessible, and, if a data collision occurs, the order of accessing to the cards is expeditiously determined to perform an efficient communication. Each card determines a timing for returning a response block containing an ID code based on conditions directed by a read/write device and the ID code of its own. The read/write device is caused to receive the response block returned by the contactless IC card and to detect a data collision. Based on this result, the conditions are changed so that a respective response block containing an ID code is returned again, thereby concurrently processing the plurality of contactless IC cards.
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