Patent ID: 11366204

Abstract:
The invention relates to a user interface device (1) coupleable to a control unit (2) via a connection cable (3) comprising at least one optical fiber for transporting light. The user interface device (1) comprises a light inlet opening (21) configured to receive light from a region outside a housing (9) of the device (1) and to couple the received light into the first optical fiber (8a) for transmitting the light to the control unit (2) when the user interface device (2) is switched off. Moreover, the invention relates to a control unit (2) coupleable to the user interface device (1) via the connection cable (3). The control unit (2) is configured to detect changes of the light received via the first optical fiber (8a) and to activate power supply to the user interface device (1) to switch on the user interface device (1) based upon the detected changes.