Patent ID: 7898392

Claim:
A control method by an RFID control system comprising a plurality of RFID antennas each having a calibration RFID tag, one or more RFID reader/writers that perform reading by operating each of said RFID antennas, and a control unit that controls each of said RFID reader/writers, wherein: said control unit comprises a storage unit that stores an antenna use procedure including one or more use timings each in turn includes one or more RFID antennas to be operated simultaneously; and performs a control step in which the RFID antennas included in each of said use timings in said antenna use procedure read from said storage unit are operated simultaneously; each of said RFID reader/writers performs: a read step in which the RFID reader/writer in question reads information held by a calibration RFID tag through an RFID antennas; and an output step in which the RFID reader/writer in question outputs the read information to said control unit; and said control unit performs; a read result acquisition step in which the control unit receives the information read by each of RFID antennas that are operated simultaneously from each of said RFID reader/writers; a non-readable combination acquisition step in which the control unit acquires a combination of RFID antennas that do not read information held by the respective calibration RFID tags, among said RFID antennas that are operated simultaneously; and a update step in which, when the combination of RFID antennas that do not read information held by the respective calibration RFID tags is acquired, the RFID antennas included in each of said use timings in the antenna use procedure in said storage unit is changed to a combination that does not coincide with the acquired combination.