| 摘要 |
PURPOSE:To make a connection with an external device without powering down a controller by connecting the controller to the external device through a connecting circuit. CONSTITUTION:The connecting circuit 7 is connected to the signal line 5 of the controller 1 and electric power is supplied thereto from a power source switching device 8; signal transmission and reception are carried out between the signal line 5 and external device 9 and a power source is turned off to cut off a signal. Therefore, the external device 9 is connected without exercising any evil influence even when the controller 1 is in operation. |
