HEIDENHAIN ND 231 B v.1 - Manual (Page 39)

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Locking the Keypad
You can disable or re-enable the keypad by entering the code
number 24 65 84:
➤ Select the user parameter P00 CODE (see “Operating
Parameters”).
➤ Enter the code number 24 65 84.
➤ Confirm the entry with ENT.
➤ With the “•” or “–” key, select KEYS ON or
KEYS OFF .
➤ Confirm your selection with ENT.
If the keypad is locked, you can select only the datum or P00
CODE through the MOD key.
Locking the Keypad