| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily control starting/stopping of a specified communication node at low cost, in a communication system constituted of many communication nodes performing mutual communication via a multiplex communication path. <P>SOLUTION: In this communication system, various kinds of control devices are connected as the communication nodes (nodes A, B, ...) to the multiplex communication path 2, and each node A, B, ... is started/stopped based on a wake-up signal output from an other node via the multiplex communication path 2. When adding a new control device (node X), the node A and the node X are directly connected by a direct line 4. When the node A detects generation of a communication request in any one of all the nodes including the node X, the node X is started/made to continue the operation by making the direct line 4 into a high level till completion of communication of all the nodes after the detection. The node X monitors a transmission output from the node A to the multiplex communication path 2 when the direct line 4 is in the high level, and transfers to a sleep state when the node X detects the operation stop of the node A from the monitoring result. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
