The board you have is controlled by your PC’s LPT Parallel Port so creating a plugin for Mach3 is reasonable straightforward.
Initially I suggest you watch the Plugin Development video’s listed on this page;
https://www.machsupport.com/help-learning/videos-tutorials/To compile your desired Plugin you will need to be using
Microsoft Visual Studio VS2008. This is not that easy to find but it is available on the net if you search.
Ed Bryson’s Wizard would be a good place to start with learning how Mach3 plugins are created, compiled & used. Here is the link;
https://www.machsupport.com/wp-content/uploads/2013/04/MachPluginWizardSetup1.1a.msiThe following document is also essential reading;
https://www.machsupport.com/wp-content/uploads/2013/04/MachIncludes.zipGood fortune with your project.
Tweakie.