Installation manual

READING FEATURES

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 90), the number of effective

scans perfor

med by the reader is giv

en 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 90 - "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.

Direction of code

movement at LS speed

Laser beam

DS4800