VFD control with Univeral GCode Sender

Need help please. How do I control my VFD (HY) when using UGS as the post processor?
I have spent several unsuccessful hours reading posts but none seem to specifically address the problem or I’ve gone bonkers and just don’t get it. In which case apologies in advance.

Shapeoko 3xxl, Huanyang VFD, 2.2kw spindle

What’s not working?
Has the spindle ever worked?

Ugs is a sender. What CAM and post processor are you using? If you send M3S5000 what happens?

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Aspire. Output gcode, Open in UGS to cut.
Yes it will work manually.

What post processor? Does the post include the M3 commands?

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