| 摘要 |
PURPOSE:To secure the control for the polling sequence at the tributary station by providing the multiple polling sequence sending circuit and the timer circuit at the control station as well as the attention sending circuit and the timer circuit at the tributary station respectively. CONSTITUTION:Control station 10 transmits 21 the multiple polling of the full station designation to tributary stations #1, #2... #n which are connected to station 10 and then starts timer 24. While tributary stations #<1>1...#n receive the multiple polling to start timer circuit 30, and circuit part 39 transmits the attention sequence when the announcement telling existence of the data is given to transmission circuit 39 from control part 38. And in case the data generated at the tributray station side requests the priority process, the priority request bit within the attention sequence is turned on. Thus, the control can be given for the polling sequence at the tributary station. |
