XHC-HB04 - wired or wireless?

I don't think that wired or wireless is the cause of the responsiveness problem.
The XHC drivers are user-space moduels, and subject to the same delays as any other user-space (non-realtime) inputs.

If you want the best responsiveness from your pendant then you need to wire into the real-time layer instead. That way the system will always act on the input in <1 mS

There are HAL pins for this purpose for each axis.

racedirector wrote:

I suspect then it is more related to the onboard software of the units then.

I think it is actually the fault of Linux and USB, actually.

[/quote]As for writing my own layer, thats a bit beyond my current comfort zone in LCNC, one day maybe [/quote]

If you have enough GPIO then wiring up a hard-wired pendant should be fairly easy. (By which I mean a pendant where every button, switch and MPG has a separate wire back to the control PC). These do exist, but are rather less convenient.

If you are using Mesa cards then the 7i73 is one answer.