If you have a DeWalt 611, you need to add a relay if you want to control the spindle, based on other forum topics, I chose the one in this post, and it works great: Relay thread
If you go that way, you also need to tell Easel (on the Machine dialog) that you have automatic control of the spindle, and set the RPM to 180000. That way it will send high enough voltage to the relay to turn it on reliably.
-Kelly