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5.6
Locking/unlocking the keyboard
The keyboard of the Defensor PH28/PH28A can be locked to prevent unauthorized access to the
stored settings.
• To lock the keyboard, press
<ESC>
key until (approx. 4 seconds) the
adjacent message appears in the display. The keyboard is locked now.
Each time you press any key the adjacent message appears again.
• To unlock the keyboard, press
<ESC>
key until (approx. 4 seconds)
the message “Key lock” disappears and the operating display is
shown.
Key lock
Set 50%rH
Act 30%rH BA3
Set 50%rH
