| 摘要 |
PURPOSE:To easily detect a wiring trouble place at the time of circuit test/ adjustment and to avoid system-down in the case of wiring trouble handled as partial functional trouble at the time of actual use. CONSTITUTION:A device interface circuit has a first output means 10, 30 outputting a received signal as it is without changing the polarity thereof, second output means 12, 32 reversing the polarity of the received signal to output said signal and the selection means 13, 34 connected to the output sides of the first output means 10, 30 and the second output means 12, 32 and selectively outputting the signal outputted from either one of those means according to indication. |
