DEVICE FOR CHECKING SWITCH LINE OF DIGITAL CONTROLLER

摘要

PURPOSE: A device for checking a switch line of a digital controller is provided to use the input of a switch efficiently by detecting the wire breaking and shorting of a line, which connects a digital controller and a switch. CONSTITUTION: The device includes an oscillating portion(400), a switching portion(600), an evaluation converting portion(300) and a state judging portion(200). The oscillating portion(400) generates the signal of the specific frequency. The switching portion(600) converts the frequency of the specific frequency signal generated in the oscillating portion(400) when the switch for inputting the wire breaking and shorting of a line or the user is opened and closed. The evaluation converting portion(300) detects the change of the frequency signal generated in the oscillating portion(400) according to the state of the line connecting the switching portion(600) and the oscillating portion(400). The state judging portion(200) informs the state of the switching portion(600) according to the result of detecting of the evaluation converting portion(300) and the state of the line connecting the switching portion(600) and the oscillating portion(400) to the digital controller.