Connecting to a CNC machine, pros and cons of USB vs PP vs Ethernet etc.

[Jess]

Because after all we are talking, or I am, about expereices using Motion control cards working with Mach3 and not about the Protocol used to do this.

We were both very obviously talking about the connection/protocol. For example; here you are, talking specifically about the protocol used, only a scant few posts ago:

The Same can't be said for USB it's irratic and unpredictable. There's so many things that can affect it IMO it's not a good or suitable connection for reliable Motion control.

Then your very next post; talking about protocol again:

Ethernet is much better than USB for Motion control

My Experience with USB and Mach3 hasn't been good or stable regardless of Device Supplier or PC.

That's fine - that's a claim based on your experience; I'm not trying to argue that you've never used a good or stable one!

However...you're not saying the same thing when your words are about USB as a whole. When you claim that USB is not a 'good or suitable connection for reliable Motion control' you're unavoidably also claiming that it's impossible for a USB motion controller to be reliable, because it uses USB.