Denso BHT-7000 User Manual page 66

Minimum number of digits to be read for ITF, STF, or Codabar (MINIMUM
DIGITS)
You may determine the minimum number of digits to be read for ITF, STF, and
Codabar. Setting a small number of digits increases the frequency of digit-missing
reading or misreading depending upon how to scan bar codes or the quality of bar
codes. On the other hand, setting a large number will diminish the possibility of those
errors.
The setting range is from 2 to 20 for ITF, from 1 to 20 for STF, and from 3 to 20 for
Codabar. The default is 4 for ITF and Codabar, and 2 for STF.
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