Patent ID: 7876226

Claim:
A method of preventing failure of reading wireless tags, for use in a wireless tag data management system comprising a wireless tag reader/writer for reading and writing tag data items from and in wireless tags by performing radio communication with the wireless tags, and a host computer connected to the wireless tag reader/writer, the method comprising: a grouping step of dividing tag IDs of the plurality of wireless tags into groups; a tag-data storing step of sequentially storing tag data items in storage areas provided for the wireless tags, respectively, each tag data item including a tag ID and related-tag data constituted by the tag IDs of other wireless tags belonging to the same group as the wireless tag; a tag-data reading step of reading the tag data items stored in the tag-data storing step, by using the wireless tag reader/writer; a first determining step of generating a list of read tag IDs and a list of related tag IDs, from the tag IDs included in the tag data items read in the tag-data reading step and the related-tag data, and then determining whether the read tags coincide with the related tags; a second determining step of comparing the list of read tag IDs with the list of related tag IDs, determining whether the read wireless tags exist in smaller numbers than the related wireless tags in case the list of read tag IDs is not identical to the list of related tag IDs, in the first determining step; and a reading-error outputting step of outputting reading-error data of the shortage of the wireless tags to a display unit of a host computer when tag IDs are determined to exist in the list of related tag IDs but not in the list of read tag IDs and outputting wireless tag mixing data to a display unit of a host computer when tag IDs may exist in the list of read tag IDs, though not in the list of related tag IDs, in the second determining step.