READING FEATURES
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7
7.2 LINEAR CODE READING
The number of scans performed on the code by the DS2100N 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 105), 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
Figure 105 - "Step-Ladder" Scanning Mode
For example, the DS2100N (500 scans/sec.) for a 25 mm high code moving at 1000 mm/s
performs:
[(25/1000) * 500] - 2 = 10 effective scans.
Direction of code
movement at LS speed
Laser beam
DS2100N
LH
