UNDERSTANDING PACKTRACK
PRODUCT REFERENCE GUIDE
171
UNDERSTANDING PACKTRACK
PackTrack is a patented operating mode for Datalogic products used to read and cor-
rectly assign codes on different parcels when read at the same time. If the codes of two
or more c
onsecutive parcels are found at the same time in the camera reading area, the
condition occurs where, 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 the first pack and vice versa, thus causing a gross error in sortation.
PackTrack uses a right-handed reference system where the X axis coincides with the
Photoelectric Sensor line, the Z axis is oriented upwards from the conveyor (see figure
below) and the Y axis coincides with the conveyor direction. The arrows point in the
positive direction. The coordinate point of origin (0,0,0) is on the left edge of the con-
veyor as illustrated.
X, Y and Z are absolute for the reading station, i.e. valid for all the cameras inde-
pendently from their position or orientation with respect to the conveyor. For this rea-
son, after the PackTrack configuration (and calibration) has been correctly performed,
when a barcode is under the beam t
o be read by the cameras, its position is defined by
the coordinates of its central point, independently from which camera is reading it.
Tracking starts 10 cm before and stops 10 cm after the Reading Area in order to ensure
the ba
r code is assigned to
the correct package.
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