SDMO R 340 U User And Maintenance Manual page 63

The navigation keys
It is also possible to navigate through the menus using the keypad.
Return to upper level or escape for
the dialogue boxes
Confirm function of selected key
It is possible to gain direct access to a menu by pressing the numerical key corresponding to its name.
The alphanumeric keys
They allow alphanumeric input by successive pressing of the keys. The characters entered appear in the order they were typed on
the keypad.
Move to the left
Move up
Move down
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Move to the right