NON-CONTACT INFORMATION MEDIUM AND AREA ENTRANCE MANAGEMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To notify the voltage state of a power source of a non-contact information medium by a simple technique.

SOLUTION: The non-contact information medium is provided with the power source 1 which supplies power, a transmitting part 2 which transmits ID data via a carrier wave of predetermined frequency, a voltage comparison part 5 which compares the voltage value of the power source 1 of predetermined reference voltage, and a CPU 6 which performs control so that voltage information indicating the voltage state of the power source 1 is generated according to a comparison result by the voltage comparison part 5 and the voltage information is transmitted by attaching it to the data to be transmitted by the transmitting part 2.

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