Re: serial communcations in a Performer world...

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Harald Kaul (harald++at++harald.munich.sgi.com)
Fri, 16 Feb 1996 17:26:49 +0100

I don't know exactly about the latencies of the serial ports, but it is
fact that the don't have very low latency. Exactly for that problem there
exists a rather new product,
HU-ASO Audio / Serial Option for Onyx and Challenge Family Systems
which offers low latency, high speed serial interfaces for Challenge and
Onyx systems. There is also a special non-streams driver for that device,
which reduces latency caused by streams overhead.

Regards,
        Harald

On Feb 15, 2:55pm, Dwight Meglan wrote:
> Subject: serial communcations in a Performer world...
> This is a bit off of Performer and graphics but surely a number of
people
> on this list must have dealt with this issue in building immersive
> environments with Performer.
>
> We have a custom interface device (a arterial catheterization tracker to
be
> exact) which uses serial communications with our Performer-based
> catheterization simulation app (its a medical procedure training
> simulator). We have found there is a 30ms delay in sending commands out
the
> serial port and the same for getting info back in -- e.g., if we send
and
> receive data from port1 to port2 it takes 60ms.
>
> I know that we can run a separate thread with shared memory but if
possible
> we want to lessen the lag time by reducing the delays in talking to and
> reading from the serial ports.
>
> Would anyone be able to suggest how to go about setting up the ports for
> faster I/O ?
>
> Thanks,
>
> --dwight
>
>
>-- End of excerpt from Dwight Meglan

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