| 摘要 |
PURPOSE:To eliminate the need for a special transmission for power feeding control by using the same transmission line as that at the operating state in the power feeding control to terminal groups installed decentralizingly. CONSTITUTION:The feeding state before the start of system operation of a node 2 is that the power is fed to a node control section 21 and a power feeding control section 22 as shown in broken lines. Power feeding command information 10 to each terminal group transmitted from a master terminal device 5 is transmitted while being converted into a predetermined format on a serial transmission line 9 via a master node 1. When the power feeding command information 10 is received by the node 2, it is identified by the node control section 21 fed already and when it is discriminated that the feeding is addressed to the own node, the node control section 21 gives own node feeding command information to the power feeding control section 22. The power feeding control section 22 receives it and applies power feeding 22 to a terminal device group 6 and a terminal device control section 23. When the terminal device group 6 and the terminal control section 23 receive the power feeding 25, READY signals 26, 27 are transmitted, the node control section 21 receives it and recognizes that the terminal device group 6 is brought into the operating state and READY information 11 is transmitted to a serial transmission line 9. |
