Can I connect ScanSnap and the computer via Wi-Fi without using a wireless access point? (Can I use ad-hoc mode?)
In the case of iX500: No. Since iX500 does not support ad-hoc mode, you cannot connect iX500 and the computer via Wi-Fi without a wireless access point.
In the case of iX100: Yes. Since iX100 supports both Access Point Connect mode and Direct Connect mode (ad-hoc), you can connect iX100 via Wi-Fi using either method.