SMC Networks PFMC7501-L Operation Manual page 62

If the security code function is enabled, it is will be necessary to input a security code to release the
key-lock.
: If a key is not pressed for 30 seconds while entering the security code, function selection mode will return.
Security code changing
Press the UP or DOWN button to input the
changed security code on the main screen.
For instructions on how to enter the security
code, refer to "How to input and change the
security code" on page 71.
After entry, the changed security code will flash
by pressing the SET button for 1 second.
(At this point, the changing of the security code is
not completed)
Return to the change of setting again by pressing
the UP or DOWN button.
Press the SET button to set.
[F81] Setting of security code completed.
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
Return to function selection mode.
No.PF※※-OMY0002