Casio IT-800 Series Software Manual page 70

Changing Character Discrepancy Threshold Values
When a comparison of the total value of bars comprising each character is performed during
scanning and said value is either too large or too small compared to that of the other characters, it
is processed as an anomalous pattern. This may result in the inability to scan due to the ratio of a
single character becoming either larger or smaller than the others. This problem can be overcome
by disabling the character discrepancy check.
Depending on the bar code system, some symbologies perform character discrepancy checks
while others do not. This change is effective for those symbologies which perform character
discrepancy checks. The symbologies which perform this check are as follows.
- EAN, JAN, UPC-A, UPC-B
- EAN, JAN, UPC-A, UPC-B Add-ons
- UPC-E
- UPC-E Add-on
Changing Minimum and Maximum Bar Threshold Values
When the thickest bar or thinnest bar among those comprising each character exceeds or falls
below the upper or lower thresholds respectively during scanning, they are processed as
anomalous patterns. For this reason, scanning may not be possible when a single bar is
excessively thick or thin, or when thick or thin bars are excessively thick or thin. This problem
can be overcome by disabling the minimum and maximum bar check function.
Depending on the bar code system, some symbologies perform minimum and maximum bar
checks while others do not. This change is effective for those symbologies which perform
minimum and maximum bar checks. The symbologies which perform this check are as follows.
- NW7
- Interleaved 2of5
Parameter Precedence Change Function
The operating order of the relevant parameters used in success decoding bar code data with the
Decode Learning function can be advanced for precedence. This advance will result in quick
response of continuously scanning multiple bar codes with similar quality. Since the precedence
order is stored in the RAM memory, it will be reset to the default order if a reset is performed on
the terminal.
Erratic Scanning Avoidance Function
This function retrieves the bar code quality rank by calculating the decoder easiness when
scanning a bar code. If the quality rank of scanned bar code is relatively low, the error rate
becomes high causing an erratic scanning to occur. To suppress the error rate, the function
automatically makes judgment on scanning with such the bar code as "Failure".
70