The device linked to from aliexpress should work, it is a simple interface that is easily configured with the generic device.
But be prepared to learn the translate tool in your browser, documentation is all in chines.
Here is a translated screen shot from the manual
If you understand what this is, go right ahead. If you don't understand it, take a safer and easier path.
Thank you so much! This is hugely helpful! The only remaining issue is my Delta MS300 VFD that is currently controlled over 0-10V analog voltage, but I saw it's not too difficult to also set it up with RS485. If someone knows how to do this with LinuxCNC or knows some tutorials, I'd be super thankful.
