I'll second the problem of using an A-to-D card with a mux. I've had
several projects where I've had to use a PC-Labs PCL-818 "High Speed Data
Acquisition Card". I found that to get complete settling of the mux takes
over a millisecond -- an eternity compared to the 3-5 microseconds
conversion time.
Norm
----- Original Message -----
From: Jonas Persson <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, August 27, 2001 4:00 AM
Subject: Re: [rtl] Need Board Recommendations - ADC, Serial I/O
Hi,
I have experiences regarding the ComputerBoards PCI-DAS 1200/jr board.
Unfortunately, I cannot recommend you to use it, since the use of a mux
close to the ADC makes it impossible to read accurate data at high
speeds. Further, the documentation was not complete, so writing a device
driver which utilized the boards burst mode was impossible (or maybe
just too hard!).
However did have use of comedi, since we could rip out the relevant code
for the acutal board an utilize it directly. This is a very good idea
since the comedi framework is hardly compatible with itself! :-)
Anyone: let me know if you find a useful, easy to program data
acquisition board that can be used in RTlinux. There are many
applications for such a board...
Regards,
Jonas Persson
"Stephen D. Cohen" wrote:
>
> Gang,
>
> I am working on a new application that requires joystick input
from
> a high quality joystick. This is done with an ADC card and some digital
I/O
> lines (for buttons). I am looking for a card that is easy to use that has
> at least two channels of analog input of at least 12 bits each and at
least
> eight lines of digital I/O. Can anyone recommend any particular card for
> this application? Any options that include source for an RTLinux driver
are
> greatly preferred. :-)
>
> I am also looking for an eight-port serial board. Can anyone
> recommend a board for use with either straight Linux or rt_comm or,
> preferably, both? I would really like to find a board that uses the same
> IRQ / port sharing / mapping scheme as the base four ports of the PC
> architecture. That way it would be pretty simple to extend the rt_comm
> stuff to handle the additional ports. If anyone has done anything like
this
> or can recommend a card, I would love to hear about it.
>
> I can obviously find many references to boards from the likes of
> Data Translations, Computerboards, etc. What I am looking for is
> testimonials to ease of use or cards for which drivers are available. I
> know about Comedi, but I am not really interested in having additional
> framework - I just want something small and tight to read the channels and
> buttons when I want the input.
>
> Both of these cards need to be PCI cards for the standard IBM-PC
> architecture.
>
> Regards,
>
> Steve Cohen
>
> --------------------------
> Stephen D. Cohen
> Xybion Sensor Positioning Systems
> 11528 53rd Street North
> Clearwater, FL 33760
> Voice: (727) 299-0150
> Fax: (727) 299-0804
> [EMAIL PROTECTED]
> www.xybion.com
>
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--
______________________________________________________________________
Jonas Persson E-mail: [EMAIL PROTECTED]
Project Manager, M.Sc C.Sc&E http://www.comsys.se/
Energyx AB (publ) Phone: +46-(0)46-286 3051
Delta 5, Scheelevägen 19F Fax: +46-(0)46-286 3505
S-223 70 Lund, Sweden
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