| 摘要 |
PURPOSE:To eliminate the remote station start end reception relay in the next monitor circuit of the outgoing trunk, by varying the conditions of the working circuit of a block monitor relay between the start mode and the release/block monitor mode by the contact of the relay that works in the start mode. CONSTITUTION:The remote station is started when the remote station starts and in a route of the earth - contact r - contact b - terminal A. The start end signal given from the remote station actuates the relay M in a route of terminal B - contact b - diode D1 - contact r - relay M - battery, and then the relay B is actuated to switch the trunk line toward the relays L and E. The relay B is released by the contact (r) in the next release monitor mode, and the trunk line is switched to the side of the relay M. Thus the relay M works until the earth of the terminal A or B does not exist any more. The resistance R and the contact (r) are connected in paralel to the winding of the next monitor relay M, and a parallel circuit of the control resistance VR and the contact (r) is provided in series. Thus a next monitor is made possible with a relay. |
