Epson Expression 1680 Setup Manual page 39

The connectors at each end of USB cables are different. The end
that connects to your computer has a "Type A" connector, shown
below:
2
The end that connects to your scanner has a "Type B" connector,
shown below:
USB hubs
You can also use a USB hub, allowing you to increase the number
of USB ports and therefore connect several devices to your
computer at the same time.
Note:
If you connect your scanner through more than one hub, your system
may not work properly. In this case, try connecting the scanner directly
to the computer's USB port. Also, your system may not work properly
if you use a USB cable other than that supplied by EPSON.
2-19
Setting Up the Scanner