Quote Originally Posted by JAZZCNC View Post
Can't help on the VFD front other than to say try find a proper manual or swap it out for decent one.
I agree

Quote Originally Posted by JAZZCNC View Post
Don't see any reason or advantage for using Modbus in DIY enviroment so I'd avoid this if possbile.
Why not? It has only advantages and no disadvantages. Of course, it requires some knowledge about it, but it isn't as simple as "avoid it if you are a DIY user". I think the biggest problem is when people try to do or use something they don't understand, in that case yes, 0-10V is easier because that can be measured and easily see how it is working. However, Modbus is not magic, very simple in fact.

But... many cheap VFDs don't have Modbus at all, just some fake serial protocol or implemented Modbus wrongly, like the HY. That's why it needs a plugin and can't be controlled via Mach3 brains or UCCNC Modbus plugin.