| 摘要 |
PURPOSE:To attain the remote confirmation for reception function of a slave station and to save the labor for inspection, by making the use of one of the control signals sent from a master station to switch the reception circuit at the salve station side. CONSTITUTION:Receiving the control signal for test from a master station, a slave station drives a test relay 1. The signal sent from a transmission line is switched to a circuit containing an attenuator of 6dB by a contact 2 of the relay 1. Thus a decoding circuit (REC)3 receives the 6dB-attenuated signal and converts it into the parallel signal by a serial/parallel slave station (S/P)4. Here a delay is produced in case the transmission line loss is exceeds the prescribed value or the (REC)3 has deterioration of its reception characteristics. Thus a delay relay 5 is driven. The action of the relay 1 is reset by the contact 6 of the relay 5 to reset a route where the normal signal is received from the master station. While the produced delay signal is sent to the master station by means of a display signal.
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