Reading Features; Advanced Code Reconstruction (Acr™ 3); Packtrack - Datalogic DX6400 Reference Manual

READING FEATURES

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4 READING FEATURES
4.1 ADVANCED CODE RECONSTRUCTION (ACR™ 3)
The traditional way of barcode reading could be called "Linear Reading". In this case, the
laser beam crosses the barcode symbol from its beginning to its end as shown in the
following figure:
Laser Beam
Figure 63 – Linear Reading
In Advanced Code Reconstruction mode it is no longer necessary for the laser beam to cross
the label from the start to the end. With just a set of partial scans on the label (obtained using
the motion of the label itself), the DX6400/DX6500 is able to "reconstruct" the barcode. A
typical set of partial scans is shown in the figure below:
Code Direction
Figure 64 – Partial Scans
None of the partial scans contains the whole label. The decoder aligns each partial scan
correctly and combines them in order to obtain the entire code.
The alignment is performed by calculating the time difference from one partial scan to
another using a reference code element.

4.2 PACKTRACK™

PackTrack™ is a patented operating mode for Datalogic Omni-Directional Reading Stations
used to read and correctly assign codes read on different packs when placed in the scanner
Reading Area at the same time.
Working in PackTrack™ mode requires the presence of an encoder and a presence sensor
to track the moving packs.
All PackTrack™ functionalities are programmed via the GENIUS™ tool (refer to the
GENIUS™ Help On-Line for details).
In fact, in the following example, the codes of two or more consecutive packs are found at
the same time in the scanner reading area. Therefore, the condition occurs where, in the
sequence of the two packs, the code of the second pack is read first, just before the code of
the previous pack. A system without PackTrack™ would assign the code of the second pack
to first pack and vice versa, thus causing a gross error in sortation.
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