Re: Measurement Computing "minilab" and "PMD" series (USB interfaces)

On Tuesday 28 September 2004 17:39, Joachim Wuttke wrote:
> Holger, thank you for your fast reply.

Hello Joachim,

in principle you are right. All I did was to use InstaCal and a USB-Monitor 
for the monitoring. If you have a ADC/DAC device at hand, then it would
be easy to retrieve the command protocol in a similar way. It can well be that 
the PMD 1024 series uses a subset of commands (there are some gaps in
the current command list where I didn't find a obvious function).
In that case a common driver for all PMD-USB devices should become possible.

With libusb (which is probably not suitable for comedi) it is very easy to
access the device. Maybe the best would be to send you the program,
so you can try it out (at least the LED-blinking test and the device-ID
stuff should work for you).

Best regards,
Holger


> As far as I understand, comedi is intended as an abstraction layer. Comedi
> allows you to write application programs that continue to work even if you
> change your hardware. Consequently, it would be quite appropriate for
> comedi to support usb measurement devices.
>
> The PMD 1024LS you mention has DIO and CTR, but no ADC or DAC. So I
> understand that your driver supports DIO and CTR, but not yet A/D
> conversion. On the other hand, from monitoring the USB channel you are
> confident that extending the support to A/D and D/A conversion would be
> straightforward. Is that correct ?
>
> If so, this is really good news for me.
>
> If you are ready to freely share your knowledge, I would very much
> appreciate if you could send me your read-write program, though I am not
> the right person to advice how it might be integrated into comedi.
>
> If you have a short summary of the USB command and data format in plain
> ASCII, it might also be appropriate to post them here to the mailing list,
> for documentation and as a base for further discussion.
>
> Regards, Joachim

Received on 2004-09-29Z10:00:41