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DX6400

4 READING FEATURES

4.1 ADVANCED CODE RECONSTRUCTION (ACR™ 4)

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 60 – 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 is able to “reconstruct” the barcode. A typical set of

partial scans is shown in the figure below:

Code Direction

Figure 61 – 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.

4.1.1 Tilt Angle for Advanced Code Reconstruction

The most important parameter in Advanced Code Reconstruction is the value of the

maximum tilt angle (α maximum) under which the code reconstruction process is still

possible.

Laser Beam

= tilt angle

0° to

max

Figure 62 – Tilt Angle

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Datalogic DX6400 Installationshandbuch Seite 70