| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication network system that can control only a node to be a communication target among the communication nodes in a low electricity consumption mode to transition to a normal operation mode without increasing the number of signal lines. <P>SOLUTION: When a node that starts a communication causes a node in a state of the low electricity consumption mode (sleep) to shift to the normal operation mode (Active), the node that starts a communication keeps a signal change state on a communication bus for a period that is longer than one normal communication frame length. In the node in a state of sleep, when the signal change state on a communication line detected by a squelch circuit continues for a period that is longer than a threshold assigned to the node itself, a Wake up control circuit outputs a Wake up signal to cause a control circuit to shift to Active. <P>COPYRIGHT: (C)2013,JPO&INPIT |
