- From: Calin A. Culianu <calin_at_ajvar.org>
- Date: Thu, 29 Aug 2002 15:15:05 -0400 (EDT)
On Mon, 26 Aug 2002, David Schleef wrote:
> On Tue, Aug 27, 2002 at 02:48:12PM +1200, David Antliff wrote:
> >
> > Hi, I'm pretty new to Comedi but I'm picking it up fairly quickly, however
> > one problem has me a bit stumped...
> >
> > I have made a few simple modifications to the cmd.c example provided with
> > comedilib-0.7.19. Originally it reads data from 4 channels, and I modified
> > it to read data from the 16 channels (subdevice 0). The first 8 channels
> > (0 to 7) work perfectly, however the last 8 (8 to 15) decend rapidly to
> > zero ('0') and remain there for the duration of the acquisition. The
> > channels have ac signals applied, or are grounded, so I would have
> > expected to see them oscillate or remain constant somewhere around
> > 32768...
>
> Sounds like you have your breakout box configured incorrectly.
>
I second that notion. Make sure your switches are in RSE or something
like that (if you use AREF_GROUND in comedi). I forget actually, but
definitely look at the manual for your breakout box...
-Calin
Received on 2002-08-29Z18:15:05