SMC Networks PF3A801H-L Operation Manual page 57

If the security code function is enabled, it is 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.
Changing of security code.
New security code is displayed on the
main display.
Press the UP or DOWN button to change
the value.
Press the SET button to move on to input
the next digit.
After entry, the changed security code will
flash by pressing the SET button for 1
second or longer.
(At this point, the changing of the security
code is not completed)
Press the UP or DOWN button to return to
setting step.
Press the SET button to set.
[F81] Setting of security code completed
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Return to function selection mode.
No.PF※※-OMY0005