SMC Networks ISA3-GCP-M1LB-L1 Operation Manual page 55

4 How to use
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[F81] Setting the security code for key-lock
A security code can be selected, which must be entered to unlock the keys.
When the security code has been set, the code entry is required to unlock the keys.
Refer to page 58 for key-lock and changing of the security code.
The default setting is "Security code is not set".
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