The scanner interface used. Usually set during installation. If you use VRS or Kofax, make sure ScanCard is set to Kofax. For all other drivers, set it to SCSI.
KOFAX
SCSI (default) — use this for any SCSI card except Kofax. Also use it when FireWire or USB interface is used for scanning. So the actual meaning is that ISIS is used instead of Kofax.