Printronix ThermaLine T5000r - Manual (Page 61)

Advanced Validator Options
61
Symbol Contrast
NOTE: This parameter factors into the Overall Grade (page 57).
The higher the value, the stricter the criterion for passing.
Symbol Contrast represents the contrast between the bars and
spaces in the bar code used by the validator for pass/fail threshold
used during the analysis of bar codes. The bar code must have a
certain level of contrast to be recognized by the validator. Bar
codes with a symbol contrast below the threshold will fail.
You can set the Symbol Contrast parameter to a percentage value
from 0% to 100%. The default is 30%.
NOTE: To disable this parameter, set Symbol Contrast to 0%.
1. Press to take the printer offline and place the printer in
Menu mode.
2. If necessary, press ↓ and
↵
at the same time to unlock the
↵
key.
3. If necessary, press until VALIDATOR displays.
4. Press ↑ until Symbol Contrast displays.
5. Press + or – to scroll through the percentage values: 0% to
100%. The default is 30%.
6. Press
↵
to select the desired value.
7. Press ↓ and
↵
at the same time to lock the
↵
key, then press
PAUSE to take the printer offline.
8. Press PAUSE again to put the printer online.
Gain
This menu item sets the scanner gain setting. This allows you to
adjust the amplitude (height) of the space/bar transitions as seen
on a Scan Profile to optimize the validator hardware for applications
where standard settings make the bar codes unreadable.
NOTE: This menu does not have a default setting because the
value is hardware dependent. The initial value is read from
the validator’s flash memory.
After the initial value has been determined, you can set the Gain
parameter to a value from 1 to 255.
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