Technical data
Leuze electronic GmbH + Co. KG
BCL 248i
130
13.2
Reading fields
13.2.1 Bar code characteristics
NOTICE
The size of the bar code module influences the maximum reading distance and the width of the
reading field. Therefore, when selecting a mounting location and/or the bar code label, take into
account the different reading characteristics of the scanner with various bar code modules.
L
Code length: The length of the bar code in mm including the start and stop characters. The quiet zone is in-
cluded depending on the code definition.
S
L
Bar length: height of the elements in mm
M
Module: The narrowest line or space of a bar code in mm
Z
B
Wide character: Wide bars and gaps are a multiple (ratio) of the module.
Z
B
= Module x Ratio (Normal Ratio 1 : 2.5)
B
Z
Quiet zone: The quiet zone should be at least 10 times the module, but not less than 2.5 mm.
Fig. 13.1:
The most important characteristics of a bar code
The range in which the bar code can be read by the bar code reader, the so-called reading field, depends
on the quality of the printed bar code and its dimensions. Therefore, above all, the module of a bar code is
decisive for the size of the reading field.
NOTICE
A rule of thumb: The smaller the module of the bar code is, the smaller the maximum reading
distance and reading field width will be.
13.2.2 Raster scanner
A raster variant is also available in the BCL 200i series. The BCL 200i as a raster scanner projects 8 scan
lines which vary depending on the reading distance from the raster aperture.
Tab. 13.1:
Raster line cover dependent on the distance
Distance [mm] starting at the zero position
50
100
200
250
Raster-line cover [mm] of all raster lines
12
17
27
33
NOTICE
There may not be two or more bar codes in the raster detection range simultaneously.
