Datalogic Matrix 120, Product Reference Manual

Page: 98 / 188

READING FEATURES
84 MATRIX 120™
READING DIAGRAMS
• The following reading diagrams are to be considered as references and are given
for typical performance at 25°C using high quality grade A symbols: Code 128 (1D
code) and Data Matrix ECC 200 (2D code) from the Test Charts available in the SW-
DOCS-TEST CHARTS accessory (93ACC0148).
• Testing should be performed with the actual Matrix 120™ using application codes
in order to evaluate whether maximizing application performance requires adjust-
ments to the HW/SW configuration with respect to the Reference Conditions
given under each diagram.
• The ratio of the Vertical FOV width with respect to the Horizontal FOV width in the
diagrams depends on the models:
- for WVGA it is about equal to 0.64; specifically 480/752. (e.e. FOVV.
≅
FOVH x
0.64);
- for MP it is about equal to 0.75; specifically 960/1280. (e.e. FOVV.
≅
FOVH x
0.75).
• The reading distance ranges are measured from the reading window surface.
• Common software parameter settings:
- reading all 1D code symbologies - Processing Mode=Standard;
- reading 2D code symbologies - Processing Mode=Standard; Code Contrast=Low;
Decoding Complexity=Medium.
• When defining a HW/SW configuration for the Matrix 120™ for conditions differ-
ent from those of the reference diagrams, it is suggested to keep in mind the fol-
lowing rules:
- Changes in
Exposure Time act directly proportional to the luminosity of the
image and inversely proportional to the maximum code reading movement speed.
Consequently, reducing the
Exposure Time by half reduces the luminosity of the
image by half but doubles the theoretical code reading movement speed.
- Changes in
Gain act directly proportional to the luminosity of the image. How-
ever, increasing the Gain value can reduce the quality of the acquired image.
• The max. theoretical Line Speed values for each diagram can be calculated using
the formula in
Chapter 6, Maximum Line Speed and Exposure Time Calculations
.