| 摘要 |
<p>PURPOSE:To prevent the system down for maintenance by constituting a line control device of a switching circuit, a power source control part and a connector and keeping the connection condition of a communication line even when the connector is separated. CONSTITUTION:When a power source control part 10b sets a sub-device to an operation condition, a switching circuit 10a is turned on and when to sets the sub-device to a dormant state, the switching circuit 10a is turned on. When the sub-device is turned on, communication lines 2 and 4 are connected. The switching circuit 10a and the power source control part 10b are connected by a connector 10c, and when the connector 10c is separated, the switching circuit 10a is set so as to be turned on. Thus, when the power source control part is maintained, a main device and a sub-device are automatically held in the connecting condition.</p> |
