> I am trying to increase the size ... VXI / VEE system with
> 512 channels running simultaneously with a 1 KHz sampling rate,
> using multiple HP1413A Cards.
> The problem is data handling and the buffering problems with that number
of channels running real time.
What are you using for a slot 0 card? If all you have tried is GPIB, there
may be faster solutions.
-- Les Hammer
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> 512 channels running simultaneously with a 1 KHz sampling rate,
> using multiple HP1413A Cards.
> The problem is data handling and the buffering problems with that number
of channels running real time.
What are you using for a slot 0 card? If all you have tried is GPIB, there
may be faster solutions.
-- Les Hammer
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> suggest which way to link the
> two programs and sync them as
> well as start and stop
> acquisitions via a LAN or
> internet link.
The easy answer is to use a socket. Sync the two computer clocks and have
one VEE program determine a set start time some time in the future - say a
second or so. The second VEE program receives it's start time & they both
start at that time.
It really depends on the data rate though. I wouldn't think cardiology
demands a super high data rate, but I have no idea. "Real Time" data
processing is always a problem. You simply won't find any kind of
determinism on any Windows platform on a millisecond time scale or below.
You can of course come up with any kind of trigger you like, but Window's
response to that trigger is not predictable.
Fake Windows (a.k.a. 95, 98 & Me) is a lot better for this kind of thing as
the IO subsystem is way closer to user code than in NT. In short, it's best
to let the instruments do their thing and buffer as much as possible without
relying on Windows to service them on short time scales.
-SHAWN-
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