| 摘要 |
PURPOSE:To improve the reliability for the transmission method of 1:N information by using together with switching both a normal polling mode and a continuous cyclic mode set when a circuit of a down-going system is disconnected or a transmission code error is generated. CONSTITUTION:When a polling signal C1 is detected in a normal mode through the transmitting part of a transmitter 1 of the 1st slave station, a station call signal is applied to a polling mode transmission control part 17 from an S/P converting part 12. A timer 20 detects an abnormality detecting signal in case a circuit break detecting part 18 detects a disconnection or an error detecting part 19 detects an error. Then the output of a cyclic mode transmission control part 21 is sent to a P/S converting part 15. As a result, a synchronizing word is unified with the input information sent from an input part 14 underwent a P/S conversion at the part 15. Thus the 1-frame information is obtained. Then the transmission is carried out continuously to a circuit switching part 103 of a transmitter 100 of a master station which is modulated at a modulating part 16. |
