Lsi Japan Co., Ltd.

Hidesuke Okada

Takashi Tanaka

Sachihiko Kobori

A interrogatorspecifies the maximum read range (S, e) in which IDs to be read may exist (Step S), and the interrogatortransmits a read request command to transponders(Step S. When there is/are a response/responses, it is judged if the response(s) is/are from a single transponderor multiple transponders(Step S). When identifying multiple responses, an exponent e of the read range (S, e) is updated to e'=e&#x2212;1 (Step S). When identifying a single response, ID of the transponderthat responded is read out (Step S) and the start S of the read range (S, e) is updated to S&#x2032;=S+d (=) (Step S). When a previous response flag F is not set to 'multiple responses received', the exponent e of the read range (S, e) is updated to e&#x2032;=e+1 (Step S).

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Tokyo, Japan

Hidesuke Okada