| 摘要 |
The coupling device comprises a controllable switch unit coupled to an output side of the communication cable, and having a first, a second and a third state. In the first state, a voltage of the communication cable is detected, and the setting of the controllable switch unit is changed from the first state to the second state, if the detected voltage is below a threshold level. In the second state, the communication cable is connected to a controller to check the reception of an identification signal indicating to the controller that a coupling device to couple a load to the cable is connected to the cable. If the identification signal is identified by the controller, the controllable switch unit connects the supply power source to the communication cable.
|
