Fujitsu fi-5900C Operator's Manual page 210

5. Speficy the detection area.
Selected range:
Enable/Disable: Select [Enable], if the area from [Start] to [End] is a Multifeed detection area.
Start:
End:
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8.4 Multifeed Detection
Add check mark to this checkbox first. The following setting becomes
available.
Middle Right
Left
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60
Select [Disable], if the area from [Start] to [End] is not a Multifeed detection area,
but other area is a Multifeed detection area.
You can specify the starting position of the selected range by the length from the
edge of the paper document.
Range: 0 to 510mm, in increments of 2mm, Start position<End position
You can specify the ending position of the selected range by the length from the
edge of the paper document.
Range: 0 to 510mm, in increments of 2mm, Start position<End position
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Detection areas
Document
Unit: mm
60