Microscan N2210WZ Owner's Manual page 167

Scanner Parameters
Symbol Reconstruction
Industrial environments present many data capture challenges, some of which are damaged
symbols, partially covered symbols, poorly printed symbols, and variation of label placement.
Symbol quality, location, and orientation cannot always be controlled. Labels containing
linear symbols (Code 39, Code 128, Interleaved 2 of 5, and UPC/EAN, for example) can
be torn, partially obscured, overprinted, or underprinted due to variations in print mechanisms.
For industrial tracking and traceability to be reliable, symbols must be decoded regardless
of damage, label tilt, or any other discontinuities.
The QX-870 features X-Mode™ technology, which allows the scanner to reconstruct data
from damaged or poorly positioned symbols by "stepping though" the elements (bars) in
multiple stages and then combining the successfully decoded regions into completed
symbol data output, as shown in the simplified example below.
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QX-870 Industrial Raster Scanner User's Manual