Encoder setup (feedback in mach3)
There is a Chinese servo motor 110ST MO6030.
There is a need to configure the encoder (feedback)
SmoothStepper Controller (Ethernet)
And the interchange board C25-Smooth Stepper LPT Board Rev. 5.
Need help setting up and connecting.

I think you'll find that as far as Mach 3 is concerned the servo motor works just like a stepper.  There is no concept of feedback in Mach 3.