WIRELESS TAG COMMUNICATION SYSTEM AND WIRELESS TAG COMMUNICATION DEVICE

摘要

Inconveniences, such as incapability of reading a wireless tag, duplication of reading a wireless tag and the like, are avoided to perform smooth reading of information. A wireless tag communication system (301) comprises at least one wireless tag (T), which has one or more session flags (S0, S1, S2, S3) that can be reversed during a response, and a plurality of readers (1A-1E) that can communicate with the respective ones of the at least one wireless tag (T). The readers (1A-1E) each comprises a reader antenna (3); a memory (8) that stores the latest notification times for the respective ones of the one or more session flags; the procedure of a step (S40) in which a session number of a session flag to be used in wireless communication of the reader antenna (3) is established based on the latest notification times stored in the memory (8); and the procedure of a step (S110) in which the established session number is used to transmit, to the wireless tag (T), a 'Query' command used for acquiring information stored in the wireless tag (T).