INTERROGATOR FOR WIRELESS TAG COMMUNICATION SYSTEM, WIRELESS TAG CIRCUIT ELEMENT AND WIRELESS TAG COMMUNICATION SYSTEM

摘要

[PROBLEMS] To perform efficient communication by shortening a communication time as much as possible by preventing the communication time from wastefully increasing due to the number of identification slots more than essentially required. [MEANS FOR SOLVING PROBLEMS] A wireless tag communication system (100) is provided with a plurality of wireless tag circuit elements (To) associated with management targets, respectively, and a reader (1) for performing information transmission/reception to and from the wireless tag circuit elements (To). The reader (1) is provided with a CPU (4), a reader antenna (3) and a RF communication control section (9). The CPU (4) generates a response request command, for searching and obtaining wireless tag information stored in the wireless tag circuit elements (To) under uncertain conditions. The reader antenna (3) and the RF communication control section (9) are capable of transmitting the response request command to the wireless tag circuit elements (To) and are also capable of receiving, corresponding to a plurality of identification slots, response signals, which are separately returned to the identification slots from the wireless tag circuit elements (To) in response to the transmitted response request command. The number of the identification slots is set based on the type of the management targets.