| 摘要 |
PURPOSE:To increase number of slave stations without a large sized master station by transmitting information between a center station and each terminal station in the frame synchronism system as well as the inverse simultaneous system and making correspondence with the polling system. CONSTITUTION:The center station 1 and a terminal station 7 are connected by a 2-wire communication line 6, the station 7 and a terminal station 14 are connected by 4-wire communication lines 22, 24, and the station 7 and a terminal station 18 are connected by 4-wire communication lines 23, 25. Then a control section 5 of the station 1 transmits a parallel data for the station 7 to a parallel/ serial converting section (MP) 2, where the data is converted into a data of inverse simultaneous tranmission with parity in 44-bit and the result is transmitted serially to the terminal station. The station 7 applies the collation of inverse simultaneous transmission and parity check to an information word in succession to a frame synchronism word and when the content of data is addressed to the own station, the data is transmitted to the station 1 while setting the carrier of the MP12. The station 1, after the end of reception, transmits the data to the station 14. |
