| 摘要 |
PURPOSE:To stop the transmission and to perform the transmission efficiently, by transmitting a data from a station equipment obtaining the right of transmission, and receiving the transmission data of itself returned cyelically from a loop at the sme time, in a loop mode transmission system. CONSTITUTION:When a station device 1 obtains the right of transmission, a tranmission control section 19 activates a line RS, a transmission signal changeover device 16 of a repeater 7 is selected to the position (b), and after an insignificant signal is transmitted for a prescribed time T1, a data is transmitted through a line SD, and then, the insignificant signal is transmitted for a prescribed time T2. Even when a receiving control section 18 is possible for receiving in this case, if the data returns cyclically in the transmission line with a delay time TL, the line RS is disconnected by receiving it, the transmission signal changeover device 16 is selected to the position (a) to attain a relay mode. No adjustment is required even for a comparatively small-sized transmission system through this and a good transmission efficiency is attained. |
