| 摘要 |
PURPOSE:To stop immediately the transmission by allowing a master station and all slave stations to receive always a transmission signal and allowing the master station or a slave station during transmission to receive the transmission data transmitted by the station of its own so as to allow the transmission station itself to detect an error in the transmission/reception data. CONSTITUTION:A master station in a distribution sub-station 1 consists of a circuit section 2 comprising a zero phase signal generating section 8 and a zero phase signal reception section 9 and of a high coupling section 4 converting a transmission signal to a distribution line. Further, a control section 7 supervising and controlling a switch 5 installed to a distribution line system is provided with a slave station comprising a zero signal generating section 8, a zero signal reception section 9 and a high voltage coupling section 4 converting a transmission signal through a distribution line. Then the transmission signal transmitted from the master station to a slave station or from a slave station to the master station via the generating section 8 is supervised always by the reception section 9 of a signal transmitting station. Thus, the error in the transmission signal is detected by not only the reception side but also the transmission side, the error of the transmission signal due to the effect of noise caused on the distribution line is detected immediately and the transmission is stopped. |
