What is the function of the USB port on my iS202?
The iS202 features a "to host" USB port.
This means that the USB port on the iS202 is designed for USB MIDI connection to a computer for MIDI control of software on your computer via an iPad application.
This is very similar to controlling a software or DAW from a MIDI controller/control surface, with the exception that the physical controller can be that of an application on the iPad. For example, DJs may use a triggering application on an iPad to send MIDI messages into Abelton Live or Reason on their computer.
This connection is designed to work one way. It allows for the transmitting, but not receipt, of MIDI messages.