The plugin allows you to manage Mach3 and receive data from it at the UI level. The exchange takes place in packets of text information and allows you to connect almost any DIY device (for example, Arduino).
Page for Download
https://ardusbserialport.wixsite.com/plugin

Thanks for the heads-up.  However the web page is virtually unreadable using Chrome because the photos overlay the text.  Any change of posting just the text here?

I am surprised. On my computer it's Chrome and everything reads fine.
Just download the zip file. There is a PDF with a detailed description.

Ah, OK, thanks!