Patent ID: 8979638
Filing Date: 2015-03-17
Classification: G06K,G06Q,G07F

Abstract:
1. A system for reading data from a plurality of chips each comprising an RFID tag, the RFID tag provided in each of the plurality of chips comprising a memory, the memory storing an intrinsic identification information of at least the chip, the system comprising: an antenna, a request signal transmission unit which transmits a request signal to a plurality of chips located in a communication range of the antenna by the antenna, the request signal designating at least 1 bit of the memory as a time slot area, an answer back receiving unit which receives an answer back at a predetermined timing from a chip from which the request signal is received via the antenna transmitted for each value stored in the time slot area of the memory provided in the chip, the answer back including the identification information of the chip and a plurality of error detection codes generated from the identification information, the plurality of error detection codes being generated in the RFID tag by methods different from that of each other or generated in advance and stored in the memory, a generation unit which produces the plurality of error detection codes from the identification information received by the answer back receiving means, an error detection unit which detects match or mismatch between the plurality of error detection codes generated by the generation unit and the plurality of error detection codes received by the answer back receiving means, and a determination unit which determines when, among a plurality of pairs of error detection codes, match of a pair of error detection codes is detected and mismatch of another pair of error detection codes is detected by the error detection means, that match of the pair of error detection codes of the chip is misrecognition resulting from collision of the answer back.