| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic shelf label system capable of easily determining whether or not a received radio signal is a proper response signal. SOLUTION: In the electronic shelf label system, when a plurality of electronic shelf labels respectively receive merchandise data signals transmitted to their own devices, infrared signals modulated by code data including the code string of an M sequence are transmitted as the response signals in response to the reception. In the meantime, a communication device determines whether or not the infrared signals are the proper response signals on the basis of whether or not the code string of the M series can be obtained from the received infrared signals (step S15). Thus, whether or not the received infrared signal is the proper response signal is easily determined. COPYRIGHT: (C)2008,JPO&INPIT
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