Method and system for identifying and communicating with a plura

Details Method and system for identifying and communicating with a plura Method and system for identifying and communicating with a plura

1995-10-06

1997-12-16

Hajec, Donald T.

Registers

Records

Conductive

235377, 235380, 902 26, 34082531, 34082534, G06K 1906

Patent

active

056988370

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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Roy Want et al, "The Active Badge Location System", ACM Transactions On Information Systems, vol. 10, No. 1, pp. 91-102, Jan. 1992.

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