Toa D-2000 Series - Manual (Page 125)

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Step 2. Select the restriction level from the pull-down menu of each Restriction settings item.
You can set 4 different levels of restrictions for each item.
Off Both administrators and operators can change the item and Restriction settings.
Low Administrators can change the item and Restriction settings.
Operators cannot change the item, but can change Restriction settings.
Mid Administrators can change the item and Restriction settings.
Operators cannot change the item and Restriction settings.
High Administrators cannot change the item, but can change Restriction settings.
Operators cannot change the item and Restriction settings.
9.1.6. Restricting each box's parameter change
It is possible to set restriction of parameter change to individual boxes displayed in the flow view.
After selecting the box on the flow view, select "Edit
Box Write Protect" from the menu.
You can set 4 different levels of restrictions for each item in the same way as stated in the preceding clause.
(Off, Low, Mid, or High)
A keylock mark is indicated on the write-protected box.