Re: Question re asynch AI, NI DAQCard-AI-16XE-50

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On Wednesday 14 May 2003 06:05 am, Carin Cronander wrote:
>
> What puzzles me now is that the last read FIFO
> buffer is always different from all the previous
> ones. It *looks* like I get two's complement in
> all but the last FIFO buffer, and straight
> binary in the last read (but a value of approx 0
> volts on the oscilloscope gives ~32000, so the
> range still appears to be [-10,10]V). All four
> channels behave the same, and if I choose to read
> 512 byte "chunks" the last 512+320 bytes are
> "odd".
>

You should never get two's complement.  You are seeing a bug in the 0.7.66 NI 
driver (credit: me).  It's been fixed in cvs for a while.

- -- 
Frank

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Received on 2003-05-14Z18:03:33