Hi Royaumedeole
It seems that I don't proof read very well. In my last post I was thinking faster than I type! I believe that I was trying to say that if the VFDplugin.dll was loaded mach 3 would E-stop when encountering M03 in th G-code if it wasn't able to communicate with the VFD, even when the VFDplugin.dll was disabled. I had to completely remove the VFDplugin.dll before mach 3 would execute the G-code with M03 embedded when the VFD was disconnected. In reference to the cables, the way I wrote the post would lead one to believe that the common-mode noise was on the motor cable, actually the motor cable is fairlly quiet. In the middle of the sentence my thought had changed to the control (RS-485) cable, that was where I was finding the common-mode noise. I have since done more checks, and believe that the Z-axis problem may be do to noise generated by the VFD somehow getting into the computer running Mach 3 because it also will lock up the keyboard. I have some thoughts on how that is happening, but haven't had the time to pursue. Hope to get at it tomorrow. By the way I want to thank you for your effort in all the work you have done, I really like how this plugin works, incidentally it is now displaying AMPS in my DRO, haven't got the speed to display yet, but again this may be on me. Mikemaat, if you are reading this, thanks for your help also. Lastly, has anyone used a opto-issolated RS-485 interface, did it help. I have one ordered so we will soon know.