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In response:

Roman Black wrote:
>
> Antonio L Benci wrote:
>
> > We NEVER rely on the PC for accurate timing requirements ;-)
>
> Any reason??

Yes... Too many experiences where Windows has faulted (so specific
reason) and the timing has been corrupted. We have used a fault tolerant
DOS system using the DOS timer with little or no problems. I don't
really trust WinXX for systems where fail-safe operation is required
such as a CNC system.

>
> > So long as the timing requirements are not USB dependant. A programmable
> > indexer which communicates via USB to a PC would be fine...
>
> Obviously using separate indexer would solve the
> problem, what I really wanted to know is can you use USB
> for high speed accurately timed output?

Never really tried...

> -Roman
>

Nino.
------------------------------------------------------
| Antonio (Nino) L. Benci                            |
| Professional Officer / Electronic Services Manager |
| School of Physics & Materials Engineering          |
| Monash University                                  |
| T: 61 3 9905 3649. F: 61 3 9905 3637               |
| M: 0414 924 833                                    |
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