Toa M-864D Ver.2.2.0 - Manual (Page 115)

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12.1.6. Box write protection
Changes to function box parameters can be prohibited for each box.
Select [Home Box Protect] from the Menu view with the box selected in the Flow view.
As with the prohibition settings on the previous page , 4 different prohibition levels (Off, Low, Mid and High) can
be set.
A key mark is displayed for write-protected boxes.
Key mark