Claytonc wrote:Do I need to isolate all pins or can I only isolate pin 14 by itself some how? Otherwise, for the cost, I might as well buy another controller board that has the relay option.
You only need one pin per function and there are many hobbyiest projects that use the parallel port to drive relays in applications other than CNC, so it's the same technique. Pin 14 is reserved for X Enable on the 2011 controller board. You can remap or assign pins in Mach 3, but no output pins are available to connect your spindle relay to on the controller board. Pin 10 is an input pin. Pins 16 and 19 (like 14) are bi-directional, but unavailable on the controller board.
Personally I don't think turning the spindle on or off under program control is all that important. Most
times you'd only be saving yourself a single mouse click over flipping a switch. In a panic situation, hitting a switch is easier and much quicker than finding the mouse and positioning it on screen, at least for me. Either way you've probably already broken a bit.
Claytonc wrote: Also, I'm a little confused about your last statement. You said, "unlike the 2011 model which requires a separate to9-12VDC input." Mine requires a 7 to 9v and a 12v power supply.
7 to 9v it is. My mistake. Sorry.