ha!
I have no clue even what an ESS smoth stepper board is so cannot advise anything about it. I just was point out what you obviously already knew - not to hook a stepper motor driver high voltage output into my little drives 5vdc max encoder inputs. I understand ur frustration and reason for the pix now
I now very little about mach3 but think it does all the motion control stuff already for you in software so I did not think there was any need for anything else other than their software and a BOB thing. shows MY ignorance I am sure!