I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 54)

Readiris TM 14 – User Guide
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Font type
Readiris distinguishes between "regular" and dot matrix printed
documents. Dot matrix printers are printers that create documents
with text made up of isolated, separate dots.
Special segmentation and recognition techniques are required to
recognize dot matrix documents and need to be activated.
To select the font type:

Click the Readiris button, and then click Advanced Settings.

Click the tab Font type.

The font type is set to Automatic by default.
That way, Readiris recognizes "24 pin" or "NLQ" (Near Letter
Quality) dot matrix, or other "normal" printing.

To recognize only dot matrix printed documents, click Dot
matrix.
Readiris will recognize so-called "draft" or "9 pin" dot matrix printed
documents.
Character pitch
The character pitch is the number of characters per inch in a
particular font. The character pitch can either be fixed, in which
case all characters have the same width, or proportional, in which
case the characters have a different width.
To select the character pitch:

Click the Readiris button, and then click Advanced Settings.