Re: pcimdda.c

Hi Timothy,

Well, please call Computer Boards and ask them, that would be great!  The
thing to ask is roughly: "whether or not analog output range can be
specified through software only, because the manual makes no mention of
any registers for changing channel range, only some on-board DIP
switches."

If you find evidence to the contrary (such as some windows util that can
set range through software) I would the only assume that their
documentation is incomplete, because the register specifications that come
with the board (and also are available on the web) make no mention of
being able to set the range through software.  A good way to test whether
this is in fact the case in reality or whether computerboards just has an
incomplete spec that they publicly ship with the board is to load up
windows and see if computerboards' native drivers are more intelligent
and/or can set the range through software.

If you really need to run your app NOW with +/-10V range, then you could
also just open up the computer and set a DIP switch for each channel on
the card in order to swap between the +5/-5 and +10/-10 range settings.
But AFAIK still there is no way for software to be able to tell you what
the card's settings are (at least according to the spec.  from CB).

If you do the legwork in finding out if there are another undocumented
bank of registers on the card.. that would really be great, though..

-Calin

On Tue, 13 Aug 2002, Curry, Timothy E  (Contractor-Summit) wrote:

> Hi Calin,
> 	 I read through your driver comments and found that you could not
> find a way to read the range jumpers on the Computer Board DDA06/16 card. I
> found an application that needs +- 10VDC output on my dda0616 card. Is there
> someone at Compter Boards that we can call to help us with this issue? I
> would really like to set the range to different modes so I can retain my 16
> bits for the full range. Maybe there are other comedi examples that read the
> jumper settings through some sort of a register.
>
> I don't mind doing the phone calls or any leg work if you can just let me
> know what to ask.
>
> Thanks again,
> Tim Curry
>

Received on 2002-08-13Z17:36:44