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Not sure about the analog input of your MESA hardware but it might be possible to use a MESA THCAD board which converts DC voltage to frequency and connects to an encoder input. But you would need to check if it is suitable for 3.3V

'M52 Pn' is Gcode so it would have to go into the Gcode program or be issued as an MDI command.

once you have the voltage (or frequency ) in HAL you can do all kinds of things including a PID loop to control the feedrate also a GUI panel should be trivial then.

Thank you, I am still far out from this project as I have not purchased anything yet, I want to make sure I know what I need and what I'm buying. I am currently learning about Ethernet ports with real-time operations and which PC to use for this.

I need someone pointing me in the right direction to get my spindle running.

I can either try to get classic ladder to work. For whatever reason, it will not work with Rio.

This is the code rio creates in the rio.hal file.
If I start LinuxCNC, it is not in Modbus Master mode. So I changed the configuration. This is what works on the same machine.

When I start LinuxCNC I get the following error:
I tried to remove the numS32out=100, but no success. I can load the program manually with the ladder editor, but it is still not in modmaster mode and won't work.

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I could also continue to work on the Modbus integration. I know which registers to read and write from my VFD, but need some starting help to translate this:

 

Into this: