The thread on the brain configuration has been helpful.
http://www.machsupport.com/forum/index.php/topic,17192.msg117298.html#msg117298I can control my spindle using the Test ModBus dialog. On/Off, direction (CW, CCW) and Freq/RPM - all fine.
So, apparently it's not a problem with the cable, hardware, or Brain. (Ok, maybe my brain).
One thing that confuses me a bit, is that the X200 manual says for coil 0002h that 0 = RV and 1 = FW.
What I am seeing is that 0 = CW, and 1 = CCW. What I am calling CW would be the direction you need for standard woodworking tools. The tool spins CW relative to the workpiece (when viewed from above).
I must have some issues with other Mach configuration, perhaps the Brain is referring to a different DRO than what I am using to display/control the spindle speed?
Steve