| 摘要 |
PURPOSE:To avoid the discontinuation of the system function, by facilitating the detection for the area of a short circuit and then cutting off the short circuit area from the system. CONSTITUTION:For the monitor terminals 31... for signal transmission, the channel (address) is set within a prescribed channel (address) range among all systems. These terminals 31... have the same constitution of circuit as the control terminals 21... and transmit the reply signal when the transmission signal of the corresponding channel given from a central monitor device A is received. At the same time, the switch means r11, r12... are controlled. These switch means are turned off if no prescribed voltage is obtained due to the reduction of impedance of a signal transmission line. |
