[Dsg-hallc_controls] Fwd: Your problem with the PT2026
Brian Eng
beng at jlab.org
Thu Jun 7 14:15:33 EDT 2018
FYI here's the exchange I had with Metrolab regarding issues we've seen with the ethernet port. Sorry about the messy formatting.
At least they've acknowledged that the problem is with their instrument.
> Begin forwarded message:
>
> From: Jacques Tinembart <tinembart at metrolab.com>
> Subject: RE: Your problem with the PT2026
> Date: June 7, 2018 at 1:50:48 PM EDT
> To: Brian Eng <beng at jlab.org>
>
>
> Regarding the open/close issue, clearly this is related to our instrument. This problem is identified on our platform but we don't have a rapid fix for it as it seems that is a major problem of our BSP Ethernet stack. So yes, your two examples are making sense to us and you are right, the first one causes a system crash whereas the second using USB doesn't.
>
> Regarding all the other problem you were facing (i.e. the system hanging when changing the units using our host software), then we think that it is NI-VISA related. We've already seen such problem with the implementation of the VISA host code being not compliant with the specification.
>
> So, we think that if your code can open the communication port only once and use the right version of the NI-VISA library, you should be able to operate the instrument without any problem.
>
> Best regards,
>
> Jacques
>
>
> -----Message d'origine-----
> De : Brian Eng [mailto:beng at jlab.org <mailto:beng at jlab.org>]
> Envoyé : jeudi 7 juin 2018 19:25
> À : Jacques Tinembart <tinembart at metrolab.com <mailto:tinembart at metrolab.com>>
> Objet : Re: Your problem with the PT2026
>
> Unfortunately not.
>
> The end goal is to interface with a PLC. We were hoping to use MODBUS, but it seems like that won't be available anytime soon. So we were going to develop/deploy a VXI-11 <-> Ethernet/IP adapter instead.
>
> Just to be more exact, the following code eventually causes the PT2026 to stop responding to any VXI-11 requests. This was opened with IDLE (the python interpreter, and run multiple times, i.e. pressing F5 to restart the entire module)
>
> import visa
>
> rm = visa.ResourceManager()
> try:
> inst = rm.open_resource("TCPIP0::129.57.195.30::inst0::INSTR")
> print(inst.query("*IDN?"))
> inst.close()
> except:
> print("failed to query instrument")
>
>
> The code below (when run from the same host computer) doesn't seem to have any issues.
>
> import visa
>
> rm = visa.ResourceManager()
> try:
> inst = rm.open_resource("USB0::0x1BFA::0x07EA::0000033::INSTR")
> print(inst.query("*IDN?"))
> inst.close()
> except:
> print("failed to query instrument")
>
>
> So it doesn't seem like it is python, PyVISA, or NI-VISA that is the problem, but the device and specifically the ethernet.
>
> ----- Original Message -----
>> From: "Jacques Tinembart" <tinembart at metrolab.com>
>> To: "Brian Eng" <beng at jlab.org>
>> Sent: Thursday, June 7, 2018 12:37:36 PM
>> Subject: RE: Your problem with the PT2026
>
>> Ok, I’ve understood. Is USB an option for you ?
>>
>>
>>
>> De : Brian Eng [mailto:beng at jlab.org]
>>
>> Envoyé : jeudi 7 juin 2018 18:34
>>
>> À : Jacques Tinembart <tinembart at metrolab.com>
>>
>> Objet : RE: Your problem with the PT2026
>>
>>
>>
>> Sorry for the confusion, I've been trying multiple computers and configurations.
>>
>>
>>
>> My computer in particular only has 2018 installed. It was the one that
>> is using PyVISA, if I open a USB resource instead of TCPIP the script
>> I sent earlier hasn't caused any problems.
>>
>>
>>
>> All setups that have tried Ethernet have seen issues and none that
>> have used USB have had problems.
>>
>>
>>
>>
>>
>> On Jun 7, 2018 12:24, Jacques Tinembart
>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>> wrote:
>>
>>
>>
>> Oh ! I thought that when you stated that the instrument was working
>> with VISA
>> 2018 you meant that you were using the Ethernet interface.
>>
>>
>>
>> What do you mean by " I've yet to have it break when doing multiple
>> runs of the script " ? My Frenglish isn't strong enough to follow your thoughts.
>>
>>
>>
>> Thanks for the very interesting feedback regarding the port mapper,
>> I'll add it to the bug list. This code comes straight from NI as we
>> bought a license for it !
>>
>>
>>
>> Best regards,
>>
>>
>>
>> Jacques
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> -----Message d'origine-----
>>
>> De : Brian Eng [mailto:beng at jlab.org <mailto:beng at jlab.org>]
>>
>> Envoyé : jeudi 7 juin 2018 18:04
>>
>> À : Jacques Tinembart
>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>>
>>
>> Objet : Re: Your problem with the PT2026
>>
>>
>>
>> The issue only seems to show up when using the ethernet interface.
>>
>>
>>
>> If I use the same PyVISA code but switch to the USB interface I've yet
>> to have it break when doing multiple runs of the script.
>>
>>
>>
>> Not sure if this is related to the problem, but I got this comment
>> from the developer of python-vxi11 when I first tried that before using PyVISA.
>>
>>
>>
>>> The port mapper server on your instrument is not implemented
>>
>>> correctly. It doesn't set the last_frag bit, and then immediately
>>
>>> closes the connection, so python-vxi11 then crashes trying to read
>>
>>> more data on a closed connection.
>>
>>
>>
>> ----- Original Message -----
>>
>>> From: "Jacques Tinembart"
>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>>
>>
>>> To: "Brian Eng" <beng at jlab.org <mailto:beng at jlab.org><mailto:beng at jlab.org <mailto:beng at jlab.org>>>
>>
>>> Sent: Thursday, June 7, 2018 11:36:14 AM
>>
>>> Subject: RE: Your problem with the PT2026
>>
>>
>>
>>> Hi Brian,
>>
>>>
>>
>>>
>>
>>>
>>
>>> Thanks for this feedback, it is reassuring to know that you have a
>>
>>> working instrument.
>>
>>>
>>
>>>
>>
>>>
>>
>>> There are no other communication port than USB and Ethernet for the PT2026.
>>
>>>
>>
>>>
>>
>>>
>>
>>> Thanks to you, we discovered this limit with the open / close
>>
>>> combination that we have to fix but it will take some time, hence our
>>
>>> advice to limit such calls. We proceeded to several tests since you
>>
>>> contacted us and were not able to reproduce the problem you mentioned
>>
>>> when using our software with a stable NI-VISA environment. We tried
>>> to
>>
>>> open and close the instrument various time by calling the software,
>>
>>> making some measurements, changing some parameters and then leaving
>>> it
>>
>>> without any problem. But again, this is not a very thorough and
>>> automated test, just a rapid check that we are not facing a major issue.
>>
>>>
>>
>>>
>>
>>>
>>
>>> Regarding the command rate, I see no limitations to this rate, but
>>> you
>>
>>> have to keep in mind that the measurement rate of our instrument
>>
>>> doesn't exceed ~ 30 measurements / seconds (min acquisition period = 30 ms).
>>
>>>
>>
>>>
>>
>>>
>>
>>> Best regards,
>>
>>>
>>
>>>
>>
>>>
>>
>>> Jacques
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>> -----Message d'origine-----
>>
>>>
>>
>>> De : Brian Eng [mailto:beng at jlab.org <mailto:beng at jlab.org>]
>>
>>>
>>
>>> Envoyé : jeudi 7 juin 2018 17:20
>>
>>>
>>
>>> À : Jacques Tinembart
>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>>
>>
>>>
>>
>>> Cc : Philip Keller <keller at metrolab.com <mailto:keller at metrolab.com><mailto:keller at metrolab.com <mailto:keller at metrolab.com>>>;
>>> Claude Thabuis
>>
>>> <thabuis at metrolab.com <mailto:thabuis at metrolab.com><mailto:thabuis at metrolab.com <mailto:thabuis at metrolab.com>>>; Simon Tellier
>>> <tellier at metrolab.com <mailto:tellier at metrolab.com><mailto:tellier at metrolab.com <mailto:tellier at metrolab.com>>>
>>
>>>
>>
>>> Objet : Re: Your problem with the PT2026
>>
>>>
>>
>>>
>>
>>>
>>
>>> Hi Jacques,
>>
>>>
>>
>>>
>>
>>>
>>
>>> I can confirm that the instrument works with 1.3.0.0 of your software
>>
>>> with only NI-VISA 2108 64-bit installed on Windows 7 SP1 64-bit.
>>
>>>
>>
>>>
>>
>>>
>>
>>> Is there a limit to the rate that either a VISA connection can be
>>
>>> opened/closed or commands can be issued?
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>>
>>
>>> P.S. Are there any other communication options besides USB/Ethernet
>>
>>> for the PT2026?
>>
>>>
>>
>>>
>>
>>>
>>
>>>> On Jun 7, 2018, at 9:56 AM, Jacques Tinembart
>>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>> wrote:
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> Hi Brian,
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> If feasible, could you please tell us if the instrument works with
>>>> an
>>
>>>> USB communication port using our software with one of you windows 7
>>
>>>> SP1 64-bit with NI-VISA 2018 64-bit computer?
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> Thanks !
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> Best regards,
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> Jacques
>>
>>>
>>
>>>>
>>
>>>
>>
>>>>
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> -----Message d'origine-----
>>
>>>
>>
>>>> De : Brian Eng [mailto:beng at jlab.org <mailto:beng at jlab.org>] Envoyé : jeudi 7 juin 2018
>>
>>>> 15:50
>>
>>>
>>
>>>> À : Jacques Tinembart
>>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>> Cc
>>>> : Simon Tellier
>>
>>>
>>
>>>> <tellier at metrolab.com <mailto:tellier at metrolab.com><mailto:tellier at metrolab.com <mailto:tellier at metrolab.com>>>; Claude Thabuis
>>>> <thabuis at metrolab.com <mailto:thabuis at metrolab.com><mailto:thabuis at metrolab.com <mailto:thabuis at metrolab.com>>>; Philip
>>
>>>
>>
>>>> Keller <keller at metrolab.com <mailto:keller at metrolab.com><mailto:keller at metrolab.com <mailto:keller at metrolab.com>>> Objet : Re:
>>>> Your problem with the PT2026
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> We've seen this problem with both NI-VISA 17 and whatever version
>>>> you
>>
>>>> have bundled with your application.
>>
>>>
>>
>>>>
>>
>>>
>>
>>>> Although it has been on different computers they all are running
>>
>>>> Windows 7 SP1 64-bit.
>>
>>>
>>
>>>>
>>
>>>
>>
>>>>> On Jun 7, 2018, at 9:42 AM, Jacques Tinembart
>>>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>> wrote:
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> Hi Brian,
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> You are right, but when you perform multiple calls of your script
>>
>>>>> you open and close the instrument several time in a few seconds,
>>
>>>>> hence the trouble. From my stand point, launching the script
>>>>> several
>>
>>>>> time in a loop can be considered as an application opening and
>>
>>>>> closing several time the communication port. But we are not going
>>>>> to
>>
>>>>> argue about that, a problem is clearly identified on that end and
>>
>>>>> can be reproduced here. The only work-around that we have right now
>>
>>>>> is to forbid this open/close sequences. Our application opens the
>>>>> communication port once and closes it only when you stop and leave it.
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> I'll check what happens when we change the units, but please note
>>
>>>>> that we've never used NI-VISA 18.0.0 64-bit. I don't think that
>>>>> this
>>
>>>>> version of VISA is related to the problem we are facing with the
>>
>>>>> open/close but it might clearly be the problem with our application
>>
>>>>> are we know for sure that using other version than the one we
>>>>> provide with the instrument usually leads to problems.
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> Thanks for your feedback,
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> Best regards,
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> Jacques
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> -----Message d'origine-----
>>
>>>
>>
>>>>> De : Brian Eng [mailto:beng at jlab.org <mailto:beng at jlab.org>] Envoyé : jeudi 7 juin 2018
>>
>>>
>>
>>>>> 15:31 À : Jacques Tinembart
>>>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>> Cc : Philip
>>
>>>
>>
>>>>> Keller <keller at metrolab.com <mailto:keller at metrolab.com><mailto:keller at metrolab.com <mailto:keller at metrolab.com>>>; Simon
>>>>> Tellier <tellier at metrolab.com <mailto:tellier at metrolab.com><mailto:tellier at metrolab.com <mailto:tellier at metrolab.com>>>;
>>
>>>
>>
>>>>> Claude Thabuis <thabuis at metrolab.com <mailto:thabuis at metrolab.com><mailto:thabuis at metrolab.com <mailto:thabuis at metrolab.com>>> Objet : Re:
>>>>> Your problem with
>>
>>>
>>
>>>>> the
>>
>>>
>>
>>>>> PT2026
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> No, it is single open/query/close in the script. The script was run
>>
>>>>> multiple times.
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> import visa
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> rm = visa.ResourceManager()
>>
>>>
>>
>>>>> try:
>>
>>>
>>
>>>>> inst = rm.open_resource("TCPIP0::129.57.195.30::inst0::INSTR")
>>
>>>
>>
>>>>> print(inst.query("*IDN?"))
>>
>>>
>>
>>>>> inst.close()
>>
>>>
>>
>>>>> except:
>>
>>>
>>
>>>>> print("failed to query instrument")
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> Regarding your previous email.
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> 1) Yes, the installation instructions were followed, namely
>>
>>>
>>
>>>>> installing the same bit-ness version of VISA as Python
>>
>>>
>>
>>>>> 2) NI-VISA 18.0.0 64-bit (the latest version) BTW, this is on
>>
>>>>> Windows
>>
>>>
>>
>>>>> 7 SP1 64-bit with Python 3.6.5 64-bit
>>
>>>
>>
>>>>> 3) Using your software (v 1.3) will also cause the PT2026 to stop
>>
>>>>> responding. It did this when we tried to change the units a few times.
>>
>>>
>>
>>>>> We've also seen using the VISA Test Panel in NI MAX (on a different
>>
>>>>> computer with 17.x) will cause the failure as well by querying
>>>>> *IDN? like the script.
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> Again, the power button doesn't always stop working like in the
>>
>>>>> video, but we can fairly consistently get VXI-11 responses to
>>>>> eventually stop responding.
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>> ----- Original Message -----
>>
>>>
>>
>>>>>> From: "Jacques Tinembart"
>>>>>> <tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>>
>>
>>>
>>
>>>>>> To: beng at jlab.org <mailto:beng at jlab.org><mailto:beng at jlab.org <mailto:beng at jlab.org>>
>>
>>>
>>
>>>>>> Cc: "Philip Keller"
>>>>>> <keller at metrolab.com <mailto:keller at metrolab.com><mailto:keller at metrolab.com <mailto:keller at metrolab.com>>>, "Simon Tellier"
>>
>>>>>> <tellier at metrolab.com <mailto:tellier at metrolab.com><mailto:tellier at metrolab.com <mailto:tellier at metrolab.com>>>, "Claude Thabuis"
>>
>>>
>>
>>>>>> <thabuis at metrolab.com <mailto:thabuis at metrolab.com><mailto:thabuis at metrolab.com <mailto:thabuis at metrolab.com>>>
>>
>>>
>>
>>>>>> Sent: Thursday, June 7, 2018 5:10:36 AM
>>
>>>
>>
>>>>>> Subject: Your problem with the PT2026
>>
>>>
>>
>>>>>
>>
>>>
>>
>>>>>> Dear Sir,
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>> We suspect that the code you wrote to communicate with our
>>
>>>
>>
>>>>>> instrument is making more than one call to the "open" and "close" functions.
>>
>>>
>>
>>>>>> Could you please confirm this fact ?
>>
>>>
>>
>>>>>> If this fact is confirmed, can you please try to work around this
>>
>>>
>>
>>>>>> problem by having your code open the interface only once for the
>>
>>>
>>
>>>>>> duration of all your operations and call the close only when you
>>
>>>
>>
>>>>>> want to stop operating and leave your application ?
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>> Best regards,
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>> Jacques
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
>>>>>>
>>
>>>
>>
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>>
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>>
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>>
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>>
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>>
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>>
>>>
>>
>>>>>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.youtube. <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.youtube.>>>>>> c>>>> o>>> m>> _
>>
>>>
>>
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>>
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>>
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>>
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>>
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>>
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>>
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>>
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>>
>>>
>>
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>>>>>> =
>>
>>>
>>
>>>>>>>
>>
>>>
>>
>>>>>> Jacques Tinembart e-mail:
>>
>>>
>>
>>>>>> tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com><mailto:tinemb>>>>> art at metrolab.com <mailto:art at metrolab.com>%3cmailto:tinembart at metrolab.com <mailto:tinembart at metrolab.com>>>
>>
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>>>>>> www.metrolab.com <http://www.metrolab.com/><https://urldefense.proofpoint.com/v2/url?u=http-3 <https://urldefense.proofpoint.com/v2/url?u=http-3>>>>>> A<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.metrolab <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.metrolab>>>>>> .com-253chttps-3A_urldefense.proofpoint.com_v2_url-3Fu-3Dhttp-2D3A
>>>>>> &d=DwIGaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=-HGzFYAh
>>>>>> 7x8pgqd5AddGJg&m=j3bFC_Mt9fDA8yotSf-_po8Wn4Gejfc2gw1n8iEbjo0&s=C7s
>>>>>> rdxmeLftZIb2TqRLoJo6nDsQYK4jMFy_caKdavhg&e=
>>>>>>>>>>> _>>> _>> w
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>>>
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>>>>>> L
>>
>>>>>> u
>>
>>>
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>>>>>> 1
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>>
>>>>>> s&r=-HGzFYAh7x8pgqd5AddGJg&m=eRwco-MmZv_gHEM9HxWpIhA0bYKy2k80jrL3G
>>>>>> 8
>>
>>>>>> k
>>
>>>
>>
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