Patent ID: 8536974

Claim:
A method of controlling a read operation from an RF tag, comprising: issuing a selection instruction to a switching section to select a first RF tag reader/writer control unit; reading a data from a reference RF tag by a first RF tag reader/writer unit through said first RF tag reader/writer control unit; continuing to select said first RF tag reader/writer control unit by said switching section if the data is successfully read out from said reference RF tag; issuing the selection instruction to said switching section to select a second RF tag reader/writer control unit when the data is not successfully read out from said reference RF tag; monitoring whether the data is successfully read out from said reference RF tag by said first RF tag reader/writer unit, through said first RF tag reader/writer control unit in order to detect recovery of said first RF tag reader/writer unit from a trouble; continuing to monitor said first RF tag reader/writer unit when the data is not successfully read out from said reference RF tag by said first RF tag reader/writer unit; and issuing the selection instruction to said switching section to select said first RF tag reader/writer control unit when the data is successfully read out from said reference RF tag.