Re: [CAD_CAM_EDM_DRO] Re: USB on Linux

Ray wrote

> I had some discussion with Matt Shaver about this recently and he thinks
> that you can consistently get 1 microsecond if you don't try to do
> anything else with it. Problem is that you want a bunch of connections
> running around the machine or process.

Holy orders of magnitude Ray! That's 1 MILLISECOND not 1 microsecond...

As I understand it, with USB you can send and recieve data with each
device address once every millisecond. If each encoder, DAC, I/O
controller, etc. had its own address you could go through them at 1kHz.
Another trick (told to me by Steve Stallings) would be to give each
device multiple addresses so that you could access it multiple times
during each 1 mS "frame".

I still like the parallel port better for now though...

Matt