| 摘要 |
<p>The coupling device comprises a controllable switch unit (110) coupled to an output side (A100a, A100b) of the communication cable (30), and having a first, a second and a third state. In the first state, a voltage of the communication cable (30) is detected, and the setting of the controllable switch unit (110) 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 (30) is connected to a controller (120) to check the reception of an identification signal indicating to the controller (120) that a coupling device (200) to couple a load (70) to the cable (30) is connected to the cable (30). If the identification signal is identified by the controller (120), the controllable switch unit (110) connects the supply power source (60) to the communication cable (30).</p> |
