Reading Features; Step-Ladder Mode - Pepperl+Fuchs VISIOLUX VB14 Series Manual

Barcode Scanner VB14

READING FEATURES

13 READING FEATURES
The number of scans performed on the code by the VB14 and therefore the decoding
capability is influenced by the following parameters:
• number of scans per second
• code motion speed
• label dimensions
• scan direction with respect to code motion
At least 5 scans during the code passage should be allowed to ensure a successful
read.
13.1

STEP-LADDER MODE

If scanning is perpendicular to the code motion direction (figure 13.1 - "step-ladder"
mode), the number of effective scans performed by the reader is given by the
following formula:
SN = [(LH/LS) ∗ SS] - 2
Figure 13.1 "Step-Ladder" scanning mode
For example, the VB14-440 (800 scans/sec.) for a 25 mm high code moving at 1250
mm/s performs:
Subject to reasonable modifications due to technical advances.
28
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Where:
VB14
[(25/1250) ∗ 800] - 2 = 14 effective scans
SN = number of effective scans
LH = label height (in mm)
LS = Label movement speed in (mm/s)
SS = number of scans per second
LH
Laser
beam
Copyright Pepperl+Fuchs, Printed in Germany