Symbol SE 2223, Integration Manual

Page: 40 / 260

2-11
Installation
2. Center the symbol (left to right) in the scan beam whenever possible.
3. Position the symbol so that the scan beam is as near as possible to perpendicular
to the bars and spaces in the symbol. Although the scanner can tolerate some tilt
of the symbols, best results are obtained with no tilt. This is especially important
with 2-D symbols.
4. Avoid specular reflection (glare) off the symbol by tilting the top or bottom of the
symbol away from the engine. The exact angle is not critical, but it must be large
enough so that if a mirror were inserted in the symbol location, the reflected scan
line would miss the front surface of the engine. 15 degrees is recommended (see
Figure 3-5 on page 3-8 ).
5. If a window is to be placed between the engine and the symbol, use a
representative window in the desired window position to determine optimum
symbol location. See the sections concerning window quality, coatings and
positioning.
6. Give the scanner time to dwell on the symbol for several scans. Poor quality
symbols may not read on the first scan. When the scanner is first enabled, it may
take two or three scans before the scanner reaches maximum performance.
Enable the scanner before the symbol is presented, if possible.
Table 2-5. SE 2223 Decode Distances
Symbol Density/
Bar Code Type
Typical Working Ranges
Near Far
6.0 mil Code 39 2.25 in / 5.72 cm 6.0 in / 15.24 cm
7.5 mil Code 39 2 in / 5.08 cm 8.0 in / 20.32 cm
13 mil 100% UPC See Note 15.0 in / 38.10 cm
20 mil Code 39 See Note 20.0 in / 50.80 cm
40 mil Code 39 See Note 25.0 in / 63.50 cm
55 mil Code 39 See Note 32.0 in / 81.28 cm
6.6 mil PDF417 2.3 in / 5.72 cm (Note) 7.0 in / 17.78 cm
10 mil PDF417 2.0 in / 5.08 cm (Note) 10.0 in / 25.40 cm
15 mil PDF417 2.0 in / 5.08 cm (Note) 16.0 in / 40.64 cm
Note: Near ranges for lower density bar codes are limited by the width of the bar
code and the scan angle.