I think I discovered what's causing most of the users of this plugin problems. If your at the point where Mach is communicating( pd001=2 pd002=2) with plugin and problems begin with start of spindle, than go to your ports and pins/
inputs and disable( mainly Estop and limit switches or any active high signal Mach is continually searching for) all for testing.
I think most will find everything working without a glitch and this is where the trouble is. If your at this point post back and we can discuss my work around or a possible fix.
Dan
BTW this is the RS-485 converter I'm using, and it cost less than $6.00
http://www.ebay.com/itm/190539776031?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649