Alper Yazar has posted an update on his open source isoUSBRS422 project.
As I said, basically it is an USB ↔ RS-422/RS-485 converter board. It can be used to communicate devices with RS-422/RS-485 interface by using a USB port of PC. Also, ground of USB port is isolated from ground of RS-422/RS-485 channel. It may help you to prevent ground loops in large systems. If you are not sure whether you need isolation or not, probably you do not need it.
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More info at Alper’s project page.
You can find the tutorial videos here.
