Hi Kit

Thanks for getting back to me.
I am trying to follow previous diagrams but do not really understand.
Here goes what I thought happens.
There is a relay on the BoB that sends a signal to the Keyes Sr1y if you want to switch motor direction. In the NC position, it is wired for Forward and in the NO position, it will use reverse.
Not really sure how other than it is controlled by Mach3.
I was hoping someone more knowledgeable might understand and help.
Greg