| 摘要 |
PURPOSE:To obtain surely the right of transmission by measuring the end of a signal block and the time of no signal state so as to decide the order of transmission. CONSTITUTION:A clock station and plural node stations are connected to a bus 6. A timer 16 of the node stations starts counting fron the end of signal block and stops counting at the start of the next signal block. That is, the timer 16 measures the no signal time of the bus 6. When the no signal time exceeds a prescribed time, the timer 16 gives an output of one pulse. A counter circuit 15 and the timer 16 are reset at the start point of time of the signal block. The count value of the counter circuit 15 goes to ''1'' at the end of the signal block. Further, an output of the timer 16 is given to the counter circuit 15. When the count value of the counter circuit 15 is N, the N-th node station acquires the right of transmission. |
