| 摘要 |
PURPOSE:To prevent the increment of the circuit current despite the actuation of a general sensor and also to attain the transmission of information even after the actuation of said sensor, by providing a switching part to a master device to apply the voltage lower than that obtained in a monitor mode of the general sensor to a circuit, and also a switching means to the general sensor to switch a current limiting element when the corresponding current is supplied. CONSTITUTION:A circuit voltage switching part 10 is provided to a master device 3, and the circuit voltage lower than the circuit voltage VH applied to a general sensor monitor part 9 is applied in a detection and monitor modes a general sensor 6. A voltage detecting means 17 is provided to the sensor 6 to switch a current limiting element Z to supply a holding current of such a degree that secures the conduction of a switching element S in an input mode of the voltage VL. Therefore, the current flowing to the element S is approximately equal to said holding current in case the device 3 detects the detecting action of the sensor 6 owing to the increment of the circuit current, and switches the circuit voltage to VL. Thus the circuit current has no sudden increase despite of the actuation of the sensor 6. Therefore, the detection of a code signal is not difficult even in case the code signal sent from the circuit repeater 5 is transmitted to the device 3. |
