| 摘要 |
PROBLEM TO BE SOLVED: To provide a reader writer with improved S/N which can decide the modulation and demodulation system of an IC card having the different modulation and demodulation system and perform reading and writing matching the system even when the card is passed through the same reader writer. SOLUTION: This reader writer comprises a transmitter receiver 1 which administers a communication protocol for data with an external computer 50, a controller 2 which controls the operation of the whole reader writer 100, a memory device 3 which stores firmware where a procedure of operating the controller 2 is recorded and a plurality of modulation and demodulation systems, a modulator 4 which modulates data from the controller 2 with a carrier, an input device 5 which inputs operation commands, a display device 6 which displays the information from the controller 2, a power amplifier 7 which performs the power amplification of an electric power supply signal as the AC signal from the controller 2 and a write command from the modulator 4, a detecting demodulator 8 which converts the carrier received from a loop antenna 9 into binarized data, the loop antenna 9 which sends and receives a carrier for electric power and data to and from an unillustrated IC card, and an all-frequency-pass filter 10. |
