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Standby function
If there is no fault or command pending, the control switches the display to "Standby".
Standby is active if the automatic closing is than 60 seconds.
Only the left point, or with active "WSD" both points, is/are displayed.
The display switches out of Standby when a new command, open or close are received or by
activation the "S" selection switch.
Lighting of the internal push buttons
Only the push button that is the next logical command is illuminated. i.e. when the door is
fully closed the open push button would be illuminated.
