Microscan MS-3 User Manual page 39

Lighting Intensity
Definition: Sets the intensity of the illumination LEDs as a percentage of the maxi-
mum intensity.
Usage: Higher intensities can be useful in lower contrast or fast-moving symbols.
Lower intensities might help decodes in high contrast, close-in symbols.
Serial Cmd: <K523,percent
Default: 50
Options: 0 to 100
Filter Mode
Definition: Four sets of digital filtering parameters can be applied as a group or indi-
vidually to improve readability for specific applications.
Usage: Used to improve scan efficiency by narrowing the choice of filters to one.
Serial Cmd: <K524,filter
Default: Automatic
Options: 0 = Automatic
Filter List
Definition: Allow user to select any of four lighting filters.
Usage: Used to improve scan efficiency by narrowing the choice of filters to one.
Serial Cmd: <K524,filter
Default: NULL
Options: 0 = Medium bar width filter
1 = Thin bar width filter
2 = Large bar width filter
3 = Vesta filter (special for Code 39)
In general, symbols at greater distances will perform better with the medium or large
bar width filters. However at optimum focal lengths, 4.75 inches for standard density
units and 2 inches for high density units, some predictions can be made, as indicated in
table 3-1. For specific steps in filter selection for specific application, see figure 3-3 on
page 3-16.
Filter
Medium bar width filter
Thin bar width filter
Large bar width filter
lighting>
mode,filter list>
(all four filters are applied during the read cycle)
1 = Select from filter list
mode,filter list>
Table 3-1 Filters by Symbol Size
Standard Density Model
10 to 15 mil symbols
7.5 to 10 mil symbols
20 mil and larger
Chapter 3 Read Cycle
High Density Model
7.5 mil symbols
5 to 7.5 mil symbols
15 mil and larger
MS-3 CCD Reader User's Manual
3-15