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Re: [Linux-gpib-general] Compatibility layer for pyvisa?
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From: Alexander H. <ale...@xx...> - 2020-11-24 14:00:34
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Yes, I found that during research a few days ago too. I'd prefer something for Linux, ideally open source, but hey, it's better than nothing. I wonder how difficult it would be to write a plotter emulator from scratch in something like python. I think it would have to understand the commands with it's coordinates and paint that on a canvas of some sort. But that's a task for another day, when the basics are working. i reached out to the pyvisa-py developers for advise, they say the 'bus error' I see in the kernel ring buffer is an indication for a low level problem. Is there anything I can do with linux-gpib directly to debug this? -Alex On Mon, Nov 23, 2020 at 03:10:24PM +0100, W wrote: > Maybe you can use this tool (http://www.ke5fx.com/gpib/7470.htm) to make a > screenshot of your display > > On 23.11.2020 00:26, Alexander Huemer wrote: > > Things start to move here. > > Your installation instructions were very useful, Walter, thank you! > > I found that I had to add --enable-python-binding to ./configure and add > > PYTHONPATH="/usr/local/lib/python3.7/site-packages/" to /etc/profile, > > but eventually I got: > > > > GPIB INSTR: Available via Linux GPIB (b'4.3.3') > > GPIB INTFC: Available via Linux GPIB (b'4.3.3') > > > > in `python3 -m visa info`. Yay! > > > > I then proceeded to play with `python -m visa shell` and visa_test.py > > and managed to enable and disable the output of my power supply and > > write fancy text to the display. > > > > There are situations in which i get error messages in the kernel ring > > buffer like these though: > > > > Nov 22 11:53:43 gpib kernel: tnt4882: write bus error > > > > and > > > > Nov 22 11:41:46 gpib kernel: tnt4882: minor 0 read timed out > > Nov 22 11:41:46 gpib kernel: tnt4882: read timed out > > > > Also, pyvisa often exits with: > > > > pyvisa.errors.VisaIOError: VI_ERROR_SYSTEM_ERROR (-1073807360): Unknown system error (miscellaneous error). > > > > and > > > > pyvisa.errors.VisaIOError: VI_ERROR_TMO (-1073807339): Timeout expired before operation completed. > > > > I haven't figured out yet why that is. Is it obvious what I am doing > > wrong here? > > > > My instruments display things like 'Rmt Addr Err' and 'REM MTA'. Not > > sure yet what these mean, but 'Err' definitely doesn't sound right. > > > > One of my goals is to be able to get screenshots off my scope. > > The programming manual says: > > > > Example: > > > > 210 CLEAR 707 ! Clear interface buffers. > > 220 OUTPUT 707;"PLOT" ! Starts plotter buffering. > > 230 SEND 7;UNT UNL ! Clears bus, set ATN line at controller true. > > 240 SEND 7;LISTEN 5 ! Tells plotter at address 5 to listen. > > 250 SEND 7;TALK 7 ! Sets 54200A/D to talk mode. > > 260 SEND 7;DATA ! Sets ATN line at controller to false > > 270 ! so data can be transferred. > > 280 WAIT 50 ! Wait 50 seconds for transfer to finish > > 290 ! Note: If programming, use the SRQ capabilities > > 300 ! of the 54200A/D to determine if the transfer > > 310 ! is complete. Attempting to program the > > 320 ! 54200A/D while making a hardcopy dump will > > 330 ! cause errors. > > > > How would I go about receiving such a plot with pyvisa or linux-gpib > > directly? Can it be done? A quick web search didn't provide insights. > > > > Thanks, > > -Alex > > > > On Sun, Nov 22, 2020 at 05:19:58PM +0100, W wrote: > > > Hi Alex > > > > > > I followed the same path as you and gave up with these NI-Visa drivers. Now > > > I have something working with linux-gpib, pyvisa/pyvisa-py on an old PC > > > (Pentium 4) > > > > > > A couple of days ago, I described my process to have this software > > > installed. If you are interested, you can find it here <https://github.com/daturach/Documentation/wiki/GPIB:-Building-an-instrumentation-lab-with-python-libraries> > > > > > > Good luck > > > > > > Walter > > > > > > On 22.11.2020 12:18, Alexander Huemer wrote: > > > > Hi > > > > > > > > That looks promising. I actually already had it installed but didn't > > > > look at it yet. From the README I figure that it has linux-gpib as a > > > > dependency. I'll have to look into it. > > > > Thanks for the suggestion. > > > > > > > > -Alex > > > > > > > > On Sun, Nov 22, 2020 at 10:58:44AM +0100, Roel Jordans wrote: > > > > > Hi Alex, > > > > > > > > > > You may want to have a look at pyvisa-py. That seems to work nicely > > > > > for me without having to install the NI-VISA drivers. > > > > > > > > > > Cheers, > > > > > Roel > > > > > > > > > > -----Original Message----- > > > > > From: Alexander Huemer <ale...@xx...> > > > > > To: Linux GPIB general mailinglist < > > > > > lin...@li...> > > > > > Subject: [Linux-gpib-general] Compatibility layer for pyvisa? > > > > > Date: Sun, 22 Nov 2020 08:57:29 +0000 > > > > > > > > > > Hi > > > > > > > > > > My understanding is this: > > > > > * linux-gpib implements drivers for many GPIB interfaces and provides > > > > > a > > > > > userspace API on top of that, which is great. > > > > > * pyvisa depends on vendor drivers like NI-VISA or the equivalent of > > > > > other vendors. > > > > > > > > > > Is this correct? > > > > > > > > > > I tried to get NI-VISA working yesterday in order to be able to use > > > > > pyvisa with a NI PCI board, on a distribution that they do not want to > > > > > support, on a i686 box. I gave up after some hours, the configure > > > > > script they have in there was written by drunk monkeys. > > > > > > > > > > So, here is my question: Did anybody consider to make the linux-gpib > > > > > drivers available to pyvisa? > > > > > > > > > > -Alex > > > > > > > > > > [1] > > > > > https://www.ni.com/de-at/support/downloads/drivers/download.ni-kal.html#334223 > > > > > > > > > > > > > > > _______________________________________________ > > > > > Linux-gpib-general mailing list > > > > > Lin...@li... > > > > > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general > > > > > > > > > _______________________________________________ > > > > Linux-gpib-general mailing list > > > > Lin...@li... > > > > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general > > > > > _______________________________________________ > > > Linux-gpib-general mailing list > > > Lin...@li... > > > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general > > > > > > _______________________________________________ > > Linux-gpib-general mailing list > > Lin...@li... > > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general > _______________________________________________ > Linux-gpib-general mailing list > Lin...@li... > https://lists.sourceforge.net/lists/listinfo/linux-gpib-general |
