Mask Mode using the RC402N menu
Press and release the button at the Standard
Display and select >>Mask Mode<< by pressing the
down arrow button.
Press and release the button, the
mask symbol occurs.
For selecting the side, press and release
one of the arrow buttons.
When all areas have been set, press
button to store the mask sector selection.
The RC402N display indicates which side of the laser
the beam has been electronically turned off.