Usb io device is a port of a computer.by which io device is connected with computer.it mainly use for trafering data.do you want to know about the usb io?you can visit this side.
industrial io board,USB IO Lab digital input/output data acquisition interfaces series available industrial automation I/O control, test and measurement.
It is a very good side.they are giving very good information abut the usb io.best of luck.thank you every body.