HEIDENHAIN TNC 620 (73498x-02) ISO programming - Manual (Page 208)

Programming: Data transfer from DXF files or plain-language contours
7.1 Processing DXF Files (Software Option)
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TNC 620 | User's Manual for DIN/ISO Programming | 5/2013
Setting layers
As a rule, DXF files contain multiple layers, with which the designer
organizes the drawings. The designer uses the layers to create
groups of various types of elements, such as the actual workpiece
contour, dimensions, auxiliary and design lines, shadings, and
texts.
So that as little unnecessary information as possible appears on the
screen during selection of the contours, you can hide all excessive
layers contained in the DXF file.
The DXF file to be processed must contain at least
one layer.
You can even select a contour if the designer has
saved it on different layers.
If it has not already been activated, select the
mode for the layer settings. In the left window the
TNC shows all layers contained in the active DXF
file
To hide a layer, select the layer with the left mouse
button, and click its check box to hide it
To show a layer, select the layer with the left
mouse button, and click its check box again to
show it