I bought my GREX about a year ago, just barely getting around to play with it. I have installed Mach3 with the G100 plugin, but cannot run any gcode. It worked only twice for me. I can see the heartbeat changing, but I cannot run any gcode. What is IsDrained in the realtime status window, it is always checked.

Thanks
Tony

It is saying that there are no moves in the buffer

Can you jog with it?