Menu
▾
▴
Re: [Linux-gpib-general] Compatibility layer for pyvisa?
|
From: W <dat...@gm...> - 2020-11-23 14:10:37
|
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 |
