Printronix T5000 Series User Manual page 9

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Overview
The data validator is an external device attached near the paper
exit of the printer. Once activated, it scans the printed output,
looking for bar codes. When the validator finds a bar code, it
determines what type of bar code it is and monitors the bar code
quality as it passes through the scan area. After the bar code
passes the scan beam, the validator grades the bar code and
sends a report to the printer. How the printer responds is
determined by the validator settings, explained in "Configuring the
Validator" on page 30.
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Installation
Instructions
The validator can track the performance of up to four horizontal
linear bar codes or one PDF 417 bar code on one line. (Vertical
bar codes are not scanned.)
The validator requires a minimum distance of 1/2 inch or 20
times the minimum element width (x-dimension) between
barcodes, whichever distance is greater.
The validator only recognizes the following linear, picket fence
bar codes: Codabar, Code 39, Code 93, Code 128, Interleaved
2 of 5, and UPC/EAN + add-ons. The validator can only
evaluate the PDF 417 bar codes.
For PDF 417 Limited, the validator works best with security
level 5 or higher, using the current default printer settings for
Deflects Percentage, Percent Decode, and Decodeability. For
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