SMC Networks PF3A703H Operation Manual page 54

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 ▲ or ▼ button to change the
value.
Press the S button to move on to input
the next digit.
After entry, the changed security code will
flash by pressing the S button for 1 second
or longer.
(At this point, the changing of the security
code is not completed)
Press the ▲ or ▼ button to return to
setting step.
Press the S button to set.
[F81] Security code complete
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Return to function selection mode.
No.PF※※-OMU0002-D