i have a strange problem with the 2020 drives . when i use the tuning software i can get the motors to run well. the parallel cable is connected straight to the computer. when i use the cnc4pc optoisolated breakout board between the pc and the 2020, the motors run very rough and erratic when trying out in mach3. connecting the parallel cable straight from the computer and 2020s in mach3 , they run silky smooth. does the optoisolation not work with the rutex products?
i assumed that the breakout board would provide a "cleaner " signal for the drives.