Mounting
Leuze electronic GmbH + Co. KG
DCR 258i
26
Observe the following criteria for the best read results:
• The reading distance is located in the middle part of the read field (see chapter 6.1.3 "Determining the
• There is no direct sunlight and protect against ambient light effects.
• The code labels are of good print quality and have good contrast ratios.
• Do not use glossy labels.
• The bar code or DataMatrix code is moved past the reading window with a tilt angle or angle of inclina-
tion of 10° … 20° (see chapter 6.1.2 "Avoiding total reflection").
6.1.2
Avoiding total reflection
If the illumination light of the code reader is directly incident on the surface of the code at an angle of 90°,
total reflection occurs. The illumination light directly reflected by the code label may overload the code
reader and thereby result in non-reading of the code.
Ä
Mount the code reader with a tilt angle or angle of inclination of ±10° … 20° from vertical.
10° … 20°
10° … 20°
1
2
3
1
Recommended tilt angle or angle of inclination: 10° … 20°
1
Code label
2
Mounting with tilt angle
3
Mounting with angle of inclination
Fig. 6.1:
Mounting with tilt angle or angle of inclination
6.1.3
Determining the reading distance
In general, the read field of the code reader becomes larger with increasing reading distance. This also re-
sults in a decrease in the resolution, however.
The following graphics show typical reading distances for the individual optics models of the code reader.
NOTICE
Code reading while in motion is dependent on the code type, code size, cell or modulus size of
the code and the position of the code in the read field of the code reader.
