Access control equipment
作者： Harold Dodd , Brian John Dr. Stanier
DOI:
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摘要: Access control equipment comprises an interrogation unit (IU) having means (14) for emitting interrogation signal, and a plurality of transponders (e.g. T), each transponder (T) stored identity code different from that the other (T). This fields holding selected information bit. The signal is controlled so as simultaneously to interrogate all within range in serial manner. A group reply sent back any having, field being interrogated, bit matching required by signal. arranged determine, series received signals, every valid range.
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