I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 61)

Readiris TM Pro 12 – User Guide
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Font type
Readiris distinguishes between "regular" and dot matrix printed
documents. Dot matrix symbols (of the type 9 pin) are 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:
 On the Settings menu, point to Font type.
 The font type is set to Automatic by default.
That way, Readiris recognizes "25 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
typeface. 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:
 On the Settings menu, point to Character Pitch.
 The character pitch is set to Automatic by default.