| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit for detecting an operating switch in a group capable of reducing the total length of the wiring. SOLUTION: This circuit is provided with a contact 22 accompanying each of a plurality of switches 21 and opening in operation of the switch 21, identification resistors R1, R2, R3, R4,... Rn provided on each contact 22 to short the contact 22 and having different resistance respectively, an electric power source 23 sending out current for the signals of a constant voltage, a voltage measuring means 24. Each contact 22 is connected to the electric power source 23 in series and a closed circuit 25 is formed while reducing the total length of the wire to the contact 22. The voltage measuring means 24 is connected to the closed circuit 25 to specify the switch 21 operated according to the change of the voltage of the closed circuit 25. COPYRIGHT: (C)2003,JPO
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