I have a client who has a Sharp multi function. It has a USB / Network port.
It seems scan only works via USB. However there is an addon card to make it work via the network. The USB is then connected to the back of the printer then connected to a card on the scanner then runs out via the Network.
The old server which I replaced had an item of software running called
"Network Scanner Tool Version 3.2
The Network Scanner Tool receives scanned image files from network scanner devices