It was in store, I've ordered this controller from Openbuilds in 2016, and it worked fine. Missed the laptop with software. Can't find order in my orders. I remember it was or on Fathers Day discount or Black Friday. This one was before xPro came.
You can connect the CNC USB controller Mk3/4 to the DQ542MA Stepper Motor Driver. Installation instructions can be found here. How to Activate Your License - download and install latest software http://planet-cnc.com/software/ - activate software using your license - open “License activation” dialog and paste your registration key. Software Download Support: http://planet-cnc.com/software/ Planet CNC • View forum - Software After you receive license code from us, in PlanetCNC TNG software click Help/License Management/My Licenses User Manual: http://planet-cnc.com/wp-content/uploads/2016/03/CNCUSBControllerMk34.pdf HOW TO SET UP A MACHINE USING THE CNC USB MK3/4 BOARD
Try here: 4-Axis CNC Mach3 USB Motion Controller Card Interface Breakout Board Click on the "learn" tab below the pictures.