Datalogic DS8100A Reference Manual

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Datalogic DS8100A Reference Manual Manual pdf 66 page image

DS8100A44 READING FEATURES4.1 ADVANCED CODE RECONSTRUCTION (ACR™ 4)The traditional way of barcode reading could be called “Linear Reading”. In this case, thelaser beam crosses the barcode symbol from its beginning to its end as shown in thefollowing figure:Laser BeamFigure 57 – Linear ReadingIn Advanced Code Reconstruction mode it is no longer necessary for the laser beam to crossthe label from the start to the end. With just a set of partial scans on the label (obtained usingthe motion of the label itself), the DS8100A is able to “reconstruct” the barcode. A typical setof partial scans is shown in the figure below:Code DirectionFigure 58 – Partial ScansNone of the partial scans contains the whole label. The decoder aligns each partial scancorrectly and combines them in order to obtain the entire code.The alignment is performed by calculating the time difference from one partial scan toanother using a reference code element.4.1.1 Tilt Angle for Advanced Code ReconstructionThe most important parameter in Advanced Code Reconstruction is the value of themaximum tilt angle (α maximum) under which the code reconstruction process is stillpossible.αLaser Beam= tilt angleα0° to α maxFigure 59 – Tilt Angle50