| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a noncontact IC card communication establishing method and a system device for searching and establishing connection while switching a communication system between a noncontact IC card and a reader/writer having a function for switching a plurality of communication interfaces respectively. <P>SOLUTION: This invention adopts a characteristic constituting means equipped with a noncontact IC card 1 and the reader/writer. There are built in the noncontact IC card 1, a receiving system selecting circuit 2 connected with an antenna 4, and a transmitting system selecting circuit 3 connected with the antenna 4. In the receiving system selecting circuit 2, a pair of demodulating selectors and a plurality of demodulating communication interfaces 2b sequentially arranged at a front stage are disposed in series to a pair of coding selectors 2c and a plurality of coding communication interfaces 2d sequentially arranged at a back stage. In the transmitting system selecting circuit 3, coding selectors 3a and a plurality of coding communication interfaces 3b sequentially arranged at a front stage are disposed in series to a pair of modulating selectors 3c and a plurality of modulating communication interfaces 3d sequentially arranged at a back stage. <P>COPYRIGHT: (C)2003,JPO |
