| 摘要 |
PURPOSE:To remove a dead zone where a port change is not transmitted by turning on a wakeup memory signal in the case when an input port is changing in a child station, and generating a wakeup signal to a parent station by turning on a sleep signal in the case when the child station is put under a low electric power consumption condition. CONSTITUTION:A parent station receives input port data on a child station 100 through a multiplex communication bus 10, and sends output port data by preparing control data according to its received data. In this case, when a change is caused to the input port data in a child station by reason that a vehicle user locked doors and so on, a wakeup memory circuit 136 turns on a wakeup memory signal (m) by receiving a port change signal (g) of a port condition detecting circuit 30. Furthermore, when the child station is put under a low electric power consumption condition (when a sleep signal (h) is turned on), a wakeup signal (j) is outputted, and the parent station is made to be restored from the low electric power consumption condition. Thereby, the parent station can recognize a change in an input port condition, and issues a data sending command, so that the wakeup memory circuit 136 can be cleared. |
