I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 37)

Readiris TM Corporate 12 – User Guide
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When you process paper documents, Readiris will start your
scanner as soon as you click the Scan button and display the
scanned document in the interface.
To scan documents:
 Click the Scanner button to set the scanner settings.
Note that several of the options in the Scanner dialog box are also
available in the Open dialog box.
 Select the correct scanner model.
If your scanner is not in the list, select Twain other models and click
OK.
 Readiris supports almost every flatbed and sheet-fed scanner,
"all-in-one" device ("MFP" - "Multifunctional Peripheral"),
digital camera and scanner standard currently available. Readiris
is Twain compliant.
Note that the Configure button is only available when applicable.
Click it to select the Twain source.
 Select the scanner settings.