READING FEATURES
4
The decoder will be able to read the label with a tilt angle b
α
max and -
α
max as
shown in the following figure:
Conveyor
Laser Beam
No Read
No Read
-
α
+
α
0
°
OK
OK
OK
OK
OK
No Read
Figure 56 – Reading Zones with
α
Max
The formulas to calculate
α
maximum depend on various parameters such as: label height,
number of scans per second, code motion speed, etc.
DX8200A scanners provide omni-directional reading by dividing the scan line into two legs
which produce a cross pattern where angle
α
is fixed for each leg (see figure below). Since
code reconstruction is used, minimum label heights at different conveyor speeds are given in
the tables in par. 4.3.1 which guarantee omni-directional reading for your application.
Conveyor
Laser Beams
-
α2
+
α2
OK
OK
OK
OK
OK
-
α1
+
α1
OK
OK
OK
OK
OK
Figure 57 – Omni-Directional Reading with
α
Max
4.2 PACKTRACK™
PackTrack™ is a patented operating mode for Datalogic Omni-Directional Reading Stations
used to correctly assign codes read on different packs when placed in the scanner Reading
Area at the same time.
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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