DS4800 REFERENCE MANUAL
7
7.2.2 Picket-Fence Mode
If scanning is parallel to the code motion, (Figure 84), the number of effective scans is given
by the following formula:
SN = [((FW-LW)/LS)
*
SS] -2 Where: SN = number of effective scans
FW = reading field width (in mm)
LW = label width (in mm)
LS = label movement speed (in mm/s)
SS = scans per second
Direction of code m
at LS speed
ovement
Laser beam
LW
DS4800
FW
Figure 84 - "Picket-Fence" Scanning Mode
For example, for a 60 mm wide code moving in a point where the reading field is 160 mm
wide at a 2000 mm/s speed, the DS4800 (800 scans per sec.), performs:
[((160-60)/2000)
*
800] - 2 = 38 effective scans
82
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