Fujitsu fi-5950 Operator's Manual page 113

[ISIS driver] Mark the "On" checkbox under "Multifeed Recovery" and set "Auto-cancel Timer" to 0 or
any value (minutes) on the [Paper Handling] tab of "Properties for Fujitsu fi-5950..." dialog
box.
3. In the Software Operation Panel or driver dialog box, select [Check
Overlapping] or [Check Overlapping and length difference].
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3.12 Not detecting Multifeed for fixed format
Auto-cancel Timer:
Scanning is not restarted for the set period of time (minutes) after a multifeed
error. If scanning is not started after the set minutes, the application is notified
of the error by the driver. Note that if the Auto-cancel Timer is set to 0, the
application will never be notified of the error.