Re: PCI-DIO-96 problems

From: Patrick Allison <barawn_at_psu.edu> · Date: 04 Jun 2002 15:39:45 -0400

Yup, driven inputs are definitely not read OK. Driving one line to 0
(using a low resistance shunt - few ohms) doesn't seem to affect
anything. If I set up the channel as an output, and then write a 1 to
it, then set it up as an input, drive it to ground, and then read back,
it'll still read as a 1.

It's really very strange, as the "values" 'written' to the board are
definitely going 'somewhere', as I can write anything I want as an
output, and then read it back any time later, and it's still there. The
only problem is that -nothing- changes on the output at all.

Has anyone actually had one of these cards working before?

Patrick

On Mon, 2002-06-03 at 16:14, David Schleef wrote:
> On Mon, Jun 03, 2002 at 03:34:08PM -0400, Patrick Allison wrote:
> > Hello -
> > 
> > We're working on setting up a small data acquistion system using Comedi,
> > and we've run into problems that we could use some help with. (comedi
> > v.0.7.64 and comedilib v0.7.18)
> > 
> > We've purchased two data acquisition cards: a Nat. Inst. PCI-6025E multi
> > I/O card which (so far) works fine, and a Nat. Inst. PCI-DIO-96 which is
> > misbehaving quite badly.
> > 
> > Any code that outputs to the PCI-DIO-96 doesn't appear to do anything
> > physical. All of the bits are stuck high (5V). However, if I write
> > values to the board, and then switch the channel to an 'input', and read
> > back, the values read back are the values that were written. It's just
> > that we don't see that on the actual output of the board.
> 
> Since the 8255 is working on the PCI-6025E, the likely cause of the
> problem is either nidio96_8255_cb() in ni_pcidio.c, or the
> initialization code for the board.  nidio96_8255_cb() appears
> to be doing the correct thing according to the manual.
> 
> Are driven inputs read correctly?
> 
> Otherwise, everything appears to be ok.
> 
> 
> 
> dave...
> 
> 
> 
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