摘要 |
<p>PURPOSE:To simplify a circuit and to guarantee operations in the case of operating a system again by providing a reception part to receive waveform signals, delay part to generate signals for driving a relay for a fixed time and relay part to supply power supply voltages. CONSTITUTION:When supplying power under remote control, a switch 6 is changed over to a remote side. When the waveform signals are inputted from IN 1 and 2 to a reception part 1 in such a state, the waveform signals are converted to pulse signals by the reception part 1 and outputted to a delay part 2. Each time the input signal is changed from L to H, at a one-shot TTL, the output signal H is held for fixed time and outputted to a switch part 3 and an AND circuit 4 and when a contact is not grounded, the switch part 3 outputs the output signal H to the AND circuit 4. Thus, the output of the AND circuit 4 is turned to H and inputted to a relay part 5, a relay contact 51 is closed, the switch part 6 is switched to the remote side and therefore, the power supply voltage is supplied to each terminal equipment 9.</p> |