Visa Resource name does not list anything

Hi,
I recently installed a Agilent 82357B GPIB and along with it I also installed Agilent IO 16.3. This GPIB is hooked up to a power supply. I am able to find and query the device in MAX and Agilent IO, but when I use the Visa Resource Name control in a VI, it does not list anything. Before I used to see LPT1 and COM1, but now even they have disappeared. All these are present in Device Manager. Even VISA interactive control throw an error. Attached are screenshots for some reference.
HP_GS
Attachments:
VisaResource-Refresh.png ‏2 KB
Visa-IC.png ‏7 KB

Hi there,
You might want to read this post about the specific error.
Also you need to make sure the right class is slected for the visa resource (right click):
Hope that helps, regards W

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Functional difference between VISA resource name ASRL1::INSTR and COM1

Config: LabVIEW 6.02, VISA 2.6.0
I have used a text constant for "VISA Configure Serial Port.vi" for years, and just now I have run into problems.
With my application, a text constant of ASRL2::INSTR would properly open the port, but it would not send any data, but using COM2 worked.
What is the difference?

MAX sets up serial port aliases automatically when possible. Let me try to explain.
If the alias "COMx" was not previously configured in NI-VISA, and you have a serial port really named "COMx", and that VISA resource string does not have any other user-configured alias, then MAX will bind that alias to that port, regardless of what the full VISA resource string is. That part actually makes sense and shouldn't confuse anyone. If the alias "COMx" is taken, or the user has manually configured a different alias for the serial port (such as "MyDMM", for example), then MAX does not auto-assign the alias for that port. So far so good.
The confusing part in many cases is how NI-VISA itself assigns the VISA resource string. For COM3, normall
y NI-VISA would assign ASRL3::INSTR, and so on. There is 1 conflict that usually screws everything up. Since NI-VISA on Win32 allows you to open the parallel port by default as ASRL10::INSTR (for extremely historical reasons), the conflict occurs when you really have a COM10. It's not a terrible conflict, but it is confusing. NI-VISA will match every other port that it possibly can, and then just assign a unique resource name (ASRLx::INSTR) for COM10.
I am not sure why in your case NI-VISA didn't match COM3 to ASRL3::INSTR. If you want to do some experimenting, try this. Go into MAX, delete all your VISA aliases, delete LPT1 from the tree, exit MAX, restart MAX, and refresh. See if that cleared it up.
Dan Mondrik
Senior Software Engineer, NI-VISA
National Instruments

A "VISA Resource Name" control

In LabVIEW there is a"VISA Resource Name" control which lists all the VISA resources, is automatically updated when devices are plugged or un-plugged, and has a Browse functionality.
With CVI you can use NIDAQmx_NewDeviceCtrl( ) on a string control, but this lists only the DAQmx resources.
Is there another function I can use to have all the VISA resources listed?
Vix
In claris non fit interpretatio
Using LV 2013 SP1 on Win 7 64bit
Using LV 8.2.1 on WinXP SP3
Using CVI 2012 SP1 on Win 7 64bit, WinXP and WinXP Embedded
Using CVI 6.0 on Win2k, WinXP and WinXP Embedded
Solved!
Go to Solution.

there is the function viFindRsrc which you can use to programmatically find all available resources.
I didn't write in my post, but I've already looked at this function.
The problem is that I have to write code to update the VISA resource list, periodically calling this function.
I prefer an automatic function.
Vix
In claris non fit interpretatio
Using LV 2013 SP1 on Win 7 64bit
Using LV 8.2.1 on WinXP SP3
Using CVI 2012 SP1 on Win 7 64bit, WinXP and WinXP Embedded
Using CVI 6.0 on Win2k, WinXP and WinXP Embedded

CDs loaded, Artist name does not appear in ARTISTS list

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Thanks-

I just found the answer on the discussion board.
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When I switched it off, Carly Simon was back in my
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Built Application containing VISA resource name control in Labview 7.1 not working

Very new to Labview (student). I built an application (my first)that uses VISA serial in Labview 7.1. The application contains a VISA resource name control. The program worked when silmulated, but not when built as app. When I removed this control from the application and made it a constant - the app worked. Any reason for this? A way around it perhaps? Would love an answer. I did make sure the Run-time engin is correctly installed and that it is not the problem. Thanks, Madri

You need to install visa runtime engine on the machine where your exe is installed
Doc-Doc
Doc-Doc
http://www.machinevision.ch
http://visionindustrielle.ch
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Old visa open, error code 1073807343, using VISA with a GPIB device, and VISA resource names

Hi everyone,
I'm trying to get a SRS model SR720 LCR meter (manual on this page) working with LabView, connecting it to my PC with an Agilent 82357A GPIB/USB interface (manual on this page). I'm running MAX version 14.0, and NI-VISA version 14.0. I'm running LabView version 13.0f2, 32 bit.
I followed the directions on this page, and I'm pretty confident I can communicate with my LCR meter, because I can go to NI MAX->GPIB0::17::INSTR under "devices and interfaces", then go to the VISA test panel, go to the I/O tab, and I can enter a few commands from the SR720 manual, like changing the frequency, and I see the light on the LCR meter change to what I just told it to do. Here is a picture, just to illustrate it:
Also, if I do the *IDN? command, it returns "
9: Write Operation (*IDN?)
Return Count: 5 bytes
10: Read Operation
Return Count: 41 bytes
StanfordResearchSystems,SR720,08087,1.03\n
So, that's good too. I also made the alias of this device "MyLCRmeter", but that shouldn't matter for now.
Now I'm trying to get it to work in a more usable way. The SR7xx drivers that LabView found for me came with a couple sample programs, one called "Getting Started.vi". I tried to just simply see if it worked, changing the "instrument descriptor" field to "GPIB0::17::INSTR", since that's the one that seemed to be the right device in MAX. Here is a picture of the front panel of "Getting Started.vi":
Trying to run it like this gave me this error (code -1073807343):
Old VISA Open in SR715/720 Initialize.vi->SR715/720 Getting Started.vi
Doing a bit of searching on these forums, I found these few threads (1 2 3), which seem to tell me that, since this program was written, the way you open VISA has changed. In the 2nd of those links, one guy said:
You just have to replace the Old VISA Open function with the VISA Open that is on the Instrument I/O>VISA>VISA Advanced palette. When you do that, the wire to the string that was used for the resource name will be broken. Delete the string and make the actual VISA Resource Name visible on the front panel. Wire the VISA Resource Name control to the connector pane where the string control was (upper left connection).
So, I went into the sub-VI Initialize.vi, and did that. Here is a picture of what the front panel and block diagram of the sub-VI Initialize2.vi (I changed the name in case I screwed things up, but I'm pretty sure the new one is the one being called by Getting Started.vi) looked like before I changed anything (you can see the Old VISA Open):
and here it is after replacing that with the regular VISA Open, deleting the instrument descriptor string and replacing it with a VISA resource, and connecting that to the VISA Open:
However, as you can see in the image above, and it seems like someone else had this problem in the 2nd thread linked above, I don't see my device listed in the drop-down menu (even if I refresh), only "LPT1" (I don't even know what that is):
No, I wasnt able to select the visa resource from the pull down menu. somehow it seems disabled or something.
If I just enter the VISA resource name from MAX manually, GPIB0::17::INSTR, and save and try running that, I get the error(code -1073807346):
VISA Open in SR715/720 Initialize2.vi->SR715/720 Getting Started.vi
So I'm not sure where to go from there, or why it's not in the drop down menu to begin with. I'm sorry if I've missed something but I've searched about as far as I can go. If I had to guess, maybe one thing could be that in MAX, under Tools->NI-VISA->VISA Options->My System->Conflict manager, I have both Agilent VISA and NI VISA enabled; I know sometimes problems arise from conflicts between different software fighting over the same hardware. Is this okay, or do I need to change it?
Thank you and please let me know if there is any other code/screenshots I could provide that could help!

Hi, I did indeed enable NiVisaTulip.dll under MAX->Tools->NI-VISA->VISA Options->My system->Passports->List of passports. Sorry, I should have mentioned that explicitly.
By install as primary, do you just mean as it is here, where it is selected as the "Preferred VISA"?
Or somewhere else? I installed NI-VISA first I believe, and then the Agilent one, and during the installation of the Agilent one, I'm pretty sure I made it not the primary. Here's what I have in the Agilent (it's called Keysight now) Connection Expert software:
I also have this under the "Keysight 488 options" tab:
Should that be checked? I don't actually know the role of VISA vs 488 here...
What could I try?
Thank you!

Visa resource name can't find

I'm running a example, visa resource name list couldn't find the port, only com port list, added USB cable (FTDI TTL-232R-3V3-WE) into visa, change visa class I/O session to USB raw, then can see it, but in configure serial port vi, I got this pic. Did I do something wrong or any suggestion?
thank you
Attachments:
2.PNG ‏32 KB

Do NOT change the I/O class to USB RAW if you want to use the device as an RS-232 port. If the device does not show up in MAX as an additional com port, first verify that you installed the correct driver that came with the device. Then, see if it appears as a com port in windows device manager. Post back If it shows up in device manager and in Hyperterminal as a com port but MAX still does not list it.

How I can saving visa resource name in windows registery and load it again?

I use visa functions in my program for serial communication , I want to save selected resource name in windows registery and next time that i run my program, i want to read it from registery and assign it to my visa resource name control.
example:         My visa resource name control value = COM2
                        I close my program with this value (how i can easily save COM2 to windows registry key ?)
                        I open my program again (how i can load COM2 in my resource name control from registry Key?)
                        How i can access to visa resource name list? example: COM1     COM2      LPT1     COM56    COM255
Thanks.
Solved!
Go to Solution.

I guess I don't understand your problem. All you have to do is ready the key containing the desired resource name and wire the resulting value to the appropriate terminal on the open VI. That's as hard as it gets...
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

How use USB with VISA resource name?

Hi,
I'm new at LabVIEW and I'm working on a code that has to acquire data from a measurement device.This device only has a USB output so I have to work with it. As far as know the block that is used to refer a external port is VISA resource name. I have installed a driver that recognizes the serial ports, and they appear in the list of VISA resource file at front panel. So I figured that installing the product's USB driver so the USB's ports would appear. I installed and nothing of USB ports. I don't know it is that simple or working with USB ports is a little bit harder. I've tried a lot of things and nothing worked so here I am.
PS: I have noticed that the driver's version is 64 bits (my pc is 64 bits) and my LabVIEW version is 32 bits, so could that be the problem?
The device by the way is Digital Analyzer WT500, Yokogawa.
Thank you.
Solved!
Go to Solution.

Victor,
the suggestion of Instrument Driver is to make more easy using the instrument.
Normally, you should install a windows drive from manufacturer (if it isn't installed, the instrument will appear like a pendrive in device manager) and the NI VISA. But for some instruments, the manufacturers have API's that uses NI VISA to communicate with your equipments.
So check if your instrument appear correctly in device manager (as indicated by Yokogawa). If not, check if Yokogawa has an appropriated driver for this instrument and install it.
Is it clear?
If you prefer, contact NI Brazil Support by website or by phone (11)3149-3149 Ext 3.
Ricardo Ramos
Engenheiro de Vendas - Sul
National Instruments Brasil

The name '' does not exist in the current context

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My Settings/Configuration
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Mark as answer or vote as helpful if you find it useful | Igor

Hi IWolbers,
>>I have a recurring problem where all of a sudden I can no longer see the values of my variables when I debug my unit tests. I cannot find a pattern as to when this happens but I experience this across one of every 20 tests that I write. Occasionally
this has also happened during normal debbuging of running code on my machine.
So you mean that it worked well before, am I right?
If you debug the same app in other VS machine, does it work well? So we could make sure that whether it is related to the VS IDE.
Please disable all add-ins in your VS IDE, and then reset your VS settings, debug it again.
https://msdn.microsoft.com/en-us/library/ms247075(v=vs.100).aspx
Or you could run your VS in safe mode, debug it again, at least, we could know that whether it is the add-in's issue.
https://msdn.microsoft.com/en-us/library/ms241278.aspx
To make sure that it is not the project files' issue, create a new blank solution, copy the project files to the new solution, clean and rebuild the solution, check the result.
>>Once I step over this to the next line (screen shot 2) I get the error message 'The name '[variable name]' does not exist in the current context'
How about debugging it with "Step Into" instead of "Step Over"? Or you could add breakpoints between 234 line to 241 line, after the breakpoint is hit, check the watch window again. How about the result?
In addition, do you check other debugger window like local or others?
Best Regards,
Jack
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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IN BW UCCHECK transaction for Unicode does not list Transfer/Update rules

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If I try and pass this "motor data" cluster with an embedded VISA resource name:
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Solved!
Go to Solution.

Doug
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Thanks for clarifying Rich can you please look at answer given in
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Visa Resource name does not list anything

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