As mentioned, there are TWO different firmware choices for the etherdongle.
(1) DMX only -- thats the one you need
(2) PIXELNET -- thats the one most people use, but it requires a smart string hub then, because its outputting pixelnet instead of dmx.
then they get DMX from the smart string hub DMX-OUT port instead. If you only use DMX and no smart strings, then
option (1) is cheaper