I CANT FIND THE VFD.DLL FILE TO CONNECT MY RS-485. WHERE ARE THEY LOCATED. I CANT SEEN TO GET MACH3 TO OPPERATE THE SPEED OF MY SPINDLE. IT WIRED CORRECTLY AND I CAN JOG X,Y,Z USING MY PENDENT BUT THE SPEED STAYS AT 120 MHZ. THIS WHY IM USING ANOTHER METHOD. ANY HELP WOULD BE GREAT