| 摘要 |
PURPOSE:To prevent malfunction, by providing a pair of contact electrodes to a card reader/writer for plural electrodes of an IC card and checking the conduction of each pair of contact electrodes to detect the soil or the damage of the card. CONSTITUTION:In response to plural electrodes (e.g., 6 units) or the IC card (not shown in the diagram), 6 pairs of contact electrodes P1A, P1B-P6A, P6B are provided to an IC card reader/writer. When an IC card is inserted to the reader/writer, a pair of contact electrodes have a contact with each electrode. The probe signal PB is impressed to conduction detecting circuits 1-6 under the control of a CPU10 to detect the presence or absence of the conduction, and H or L signals CN1-6 are delivered. When all signals are set at H, an AND20 sets a signal NM at H. Then the circuit 10 starts transmission of data between the IC card and the reader/writer. This avoid an error due to the soil of the card as well as the damage of the card owing to the impression of a voltage to the electrodes other than the normal ones of the card. |
