| 摘要 |
PURPOSE:To reduce hindrance to an actual communication by providing a circuit-break detecting circuit to the titled device of a telex switchboard and minimizing the continuation of a circuit break due to the fault of a leadin switch in the automatic leading-in device. CONSTITUTION:For leading a circuit into a circuit test board LTCSL, a control part CONT having received an instruction from the central processor CP of a switchboard EXSW drives a make contact and a switch SWB in the switch SWA of a specified circuit. After its drive is completed, a break contact in the switch SWA which corresponds to the specified circuit is driven for disconnection, and a corresponding circuit detecting circuit monitors the output of the switch SWB; when a current absence state continues for more than time equivalent to one character, a circuit break is considered to occur to stop the driving the break contact, thereby connecting the circuit side of the specified circuit and the switchboard EXSW directly. |
