[ a n y m a ] - uDMX - tiny bus powered USB-DMX …
We power the RS485 transciever directly from the usb bus - it might be a better idea to put in a dc/dc converter and there should be some overvoltage protection. Ben Suffolk shows how it could be done with his bus powered USB-DMX Interface. There is a 5pin XLR connector for the DMX and the cable of a dead mouse wired directly to the board for USB.