Sorry, but what is a "Digital dream UC300 controller"? The only two UC300 I know of are made by CNC Drive in Hungary. One is USB the other is ETH, so is your controller made by CNC Drive or not? Is it USB or ETH? Perhaps there are other UC300 controllers also, but as far as I know, all are the product of CNC Drive. I don't know any "Digital dream", sounds like a cheap Chinese copy. Anyway, if you mean this product then you are definitely on the wrong forum because this is NOT a CNC Drive product.
Also, this forum is not a Mach3 forum, but UCCNC, which is also a CNC Drive product.