Guntermann & Drunck OperatorPanel - Handbuch (Seite 31)

Status displays
12 · G&D OperatorPanel
LEDs of »Select« buttons
Each Select button provides two LEDs.
The LEDs ahve the following meaning:
LED Status Meaning
Above On Active channel.
Off Inactive channel.
Below On Channel is selected by user or connected device.
Off Channel is not selected by user.