Did you have any problems setting this up at all Jay?? Just tried it myself as I wanted to have spindle speed controlled by mach3, downloaded everything OK installed OK set up the plug in OK & got the message that it had been successfully configured but when I start mach3 things seem to start ok, machine moves, spindle starts & everything looks great but then I get an estop & it all stops.
Thought it might be a problem with one part of the gcode but it does it in a different place everytime so no consistency other than it bringing up the estop.