READING FEATURES
7
7.2 LINEAR CODE READING
The number of scans performed on the code by the DS4800 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.
7.2.1 Step-Ladder Mode
If scanning is perpendicular to the code motion direction (Figure 83), the number of effective
scans performed by the reader is given by the following formula:
SN = [(LH/LS)
*
SS] – 2 Where: SN = number of effective scans
LH = label height (in mm)
LS = label movement speed in (mm/s)
SS = number of scans per second
Direction of code
movement at LS speed
DS4800
LH
Laser beam
Figure 83 - "Step-Ladder" Scanning Mode
For example, the DS4800 (800 scans/sec.) for a 25 mm high code moving at 1250 mm/s
performs:
[(25/1250)
*
800] - 2 = 14 effective scans.
81
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