How to turn on A axis (rotation only, non-spindle) in Router 6040 using G-code

Hello,

I have Router 6040 with 4 axes, X Y Z A and using Mach3 software

https://www.cnczone.com/forums/attac...d=392738&stc=1

I want to know how to activate the A axis (in the picture, it rotates only like the spindle) by using G-code.
I know how to do it manually by using the keyboard, but I need to include it in my program to be automatic.
Hint: there is no manual for coding for this machine, only configuration file.

anybody? :(