| 摘要 |
PURPOSE:To attain sure correspondence even at departure or return of an optional node by using two kinds of transmission line control signals to obtain the right of use of transmission line of each node (data transmission equipment) by the node itself within a prescribed time without fail thereby executing easily the transmission line assigning control of each node. CONSTITUTION:After a master node #1STN transmits an SL signal and information to be transmitted succeedingly is transmitted as transmission frame I11, I12, an L signal L1 is transmitted. A counter circuit of each node counts up by one, a count value outputs a transmission permissible signal by a comparator circuit of a node corresponding to a set node number to start data transmission. When the transmission data is lost, the transmission request signal is lost, an L2 is transmitted and the right of transmission is given to the next node. When each node transmits data and the last node #NST transmits an L signal LN, the master node transmits the SL signal and the data transmission of the next period is started. |
