Nexus Cidron Combi Reader, Руководство по установке

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When installing directly to wall or door, use the recommended
vertically aligned holes (as picture describes). If using other screws
than the ones supplied with the reader, make sure to use a flat headed
screw with a maximum height of 2.8 mm and a maximum diameter of
7.8 mm on the screw head.
Make sure not to tighten the screws too hard as doing so will deform
and skew the installation plate. This may affect the tamper switch
functionality of the reader. Countersunk screws should never be used.
21 mm
48 mm
69 mm