Hi,
I inherited a 3 axis CNC router that was originally controlled via a RichAuto A51 hand held control that has failed for the 3rd time.
So, I hope to be able to replace the original control with a PC and Mach3.
I already own a small machine that I produce parts on using Mach3 that is installed on a desktop WinXP machine.
I am conversant with G code programming, tooling etc., but my expertise is almost non existent when it comes to building a control 'from scratch'.
Has anyone the necessary information on how to complete the modification or could perhaps provide me with the necessary links to sources that provide the information?
I have sufficient resources at hand to perform the electrical connections and I'm happy to purchase the details if required.
Many thanks in anticipation of any replies and assistance.   

Check out this wiring diagram for upgrading a Richauto to an Ethernet Smooth Stepper with a C25XP:https://www.cnc4pc.com/blog/post-4/upgrade-richauto-to-a-c25xp-66