| 摘要 |
PURPOSE:To prevent malfunction, by transmitting and receiving a control signal meaning ''start'' and a control signal meaning ''completion of preparation '' in response to the said control signal, by making the time and the number of times interrupting DC different in a bidirectional transmission/reception system for the control signal. CONSTITUTION:To start from A to B, after the operation of a relay SA(not shown), when one restoration of the relay SA, i.e., one interruption pulse is transmitted as start information, a relay B at the B side is operated and succeedingly, a relay BH functioning as line holding monitor is operated. Relays BG and BC having a guard time monitor function counting the number of pulses are operated with this interruption pulse, relays BS and BR having count functions are operated with the rising conditions of the interrupting pulse, and thereafter, start information is transmitted with the restoration of the raly BG until the ralay BC is restored. At the device B, the relay SB(not shown) is operated, two interrupting pulses are transmitted, and relays A, AH, AG, AC at the A side are operated as a reception preparation completion signal, which is detected with a relay AR. |
