Hi Filusico,
To tell you the truth, I got fed up with trying to get the Novusun working. After about a month of trying all kinds of tricks, calling people, and getting no help from Novusun, I broke down and bought the UC400ETH (~$150). from CNC4PC.com. It works GREAT right out of the box, no issues what so ever. I used this breakout board with it. https://www.ebay.com/itm/5-Axis-CNC-...AAAOSwrFtaOM0E
everything working and the manual has all your Mach3 settings. I am using the CNC4PC software which works very well, and comes with the Ethernet controller, so no added expense there.
Bottom line, the faster you get rid of the Novusun, the quicker you will have a machine up and running.
Hope this helps.
Regards Schifty1