topic Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment in LabVIEW

Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Sat, 31 Mar 2012 17:54:22 GMT

What hw driver to install? 488.2, VISA or both for LabView to start with GPIB . each driver is 300MB !!?

1.) Does VISA installation include 488.2 ? 2.) What application will need for deployment ?

3.) How to assert deassert GPIB REN with GOTOLOCAL using VISA in LV ?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Sat, 31 Mar 2012 18:52:28 GMT

Install both. Do your development with the VISA functions. You'll be better off in the long run.

First, look for an already written driver. Use Help> Find Instrument Drivers.

Use VISA GPIB Control Ren of course.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Sat, 31 Mar 2012 23:58:54 GMT

Thanks for quick response. I'm new to this place and LV.

It would be OK for me to install both for development but what about application deployment? I don't feel good about two additional installations of 300MB each ??!! Is there any list of files to include in app setup, just ?...sorry.

I can't find viParseRsrc function. Is there one? How to parse that stuff FindRsrc function returns ?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Sun, 01 Apr 2012 01:09:22 GMT

The VISA runtime is much smaller. If and when the instrument connection changes to USB or ethernet, you won't have to rewrite any code. What you are referring to are C functions.

The VISA Find Resource function returns an array of strings.

Did you search for an existing driver?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Sun, 01 Apr 2012 04:19:04 GMT

I expect VISA concept shouldn't depend on IDE whatever it is C or LV ? How does your test system check available resources and aliasing insruments ?

So far what I find is like in my C# code I can OpenSession defaultRM than FindRsrs next it needs to know what my system has, so it needs to ParseRsrs from FindRsrs returns or to use FindRsrsNext .....

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Sun, 01 Apr 2012 04:28:01 GMT

As I said, the LabVIEW function returns a string array. You are on the wrong board to be asking about C#.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Sun, 01 Apr 2012 05:01:58 GMT

Sorry, I was not asking about C# I am asking about LV concept . I want to buit application in LV using my knowledge of VISA

I installed both VISA and 488 and get this

I installed both VISA and 488 .... however I get this :

Error -1073807202 occurred at VISA Open in GPIB-VISA.vi

LabVIEW: (Hex 0xBFFF009E) VISA or a code library required by VISA could not be located or loaded. This is usually due to a required driver not being installed on the system. ========================= VISA: (Hex 0xBFFF009E) A code library required by VISA could not be located or loaded.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Sun, 01 Apr 2012 05:15:02 GMT

That usually indicates VISA is not installed. What version did you install and on what os? Does Measurement & Automation Explorer list it?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Sun, 01 Apr 2012 16:08:41 GMT

I have Windows7. It looks like there was a conflict with Agilent drivers. I uninstalled everything first and reinstalled NI 488 and VISA. Now I have this:

Error -1073807195 occurred at VISA Open in GPIB-VISA.vi VISA: (Hex 0xBFFF00A5) The interface type is valid, but the specified interface number is not configured.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

JoshY — Tue, 03 Apr 2012 00:50:11 GMT

Hi Mick,

Which version did you install? Also, does it show up in MAX (Measurement and Automation Explorer)?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Wed, 04 Apr 2012 01:07:48 GMT

Thanks. That problem has been solved.

I need to reproduce my test fixture to control it using USB-GPIB ( Prologix ) adapter and LabView . I have no experience with this.

So far, I've read many posts and have got some ideas. though . still have questions such as

1. How to do aliasing in VISA serial and VISA gpib in LV

2. How to parse resources found with FindRsrc ? and where is FindRsrcNext ? in LavView ?

Could you give any links to tutorials and examples?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Wed, 04 Apr 2012 01:56:52 GMT

Aliases will show up in the pull down menu of the VISA Resource Name Control. You merely select the one you want. I already told you that the VISA Find Resources returns a string array. You need to take a LabVIEW basic tutorial if you do not understand. A string can be used as a resource name.

If you are stuck with the prologix, all you will be using is serial communication and you can not use already written drivers. Personally, I think it's for hobbyists.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Wed, 04 Apr 2012 15:41:47 GMT

Could you recommend any good tutorial ?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Wed, 04 Apr 2012 16:46:05 GMT

Here

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Wed, 04 Apr 2012 23:31:20 GMT

thanks

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Fri, 06 Apr 2012 22:48:09 GMT

According to LabView help VisaOpen function can provide interaction with serial port by using ASRL::INSTR resource.

I can open visa session, get it' handler and OK . than viwrite sends commands and returns OK as well, but the read buffer of that port remains 0 ?

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Fri, 06 Apr 2012 22:53:40 GMT

Well, since you are dealing with a serial port, there are numerous possibilities that there is nothing to read. If the Write is not correct, there will be no error generated but the instrument will not respond. You could have a mismatch in com settings, the wrong serial cable, the wrong command being sent, no termination character, incorrect termination character. Also, there is no need for calling the VISA Open function. All that you have to do is call the VISA Configure Serial Port - just like the examples do.

Please provide your code and the actual instrument you are trying to talk to. Before sending the code, make sure your string controls have data and then go to Edit>Make Current Values Default. Save the VI and attach it.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Sat, 07 Apr 2012 14:49:39 GMT

It is supposed to be fully automated system which doesn't depend on hardware realization.

So, the program has to use VisaOpen and ViFindRsrc to determine what branch of the program will work with that particular hardware. am I wrong?

1. Mismatch in com settings - (checked) I use default settings working fine in my original program.

2. Wrong serial cable - (no serial cable) it is Prologix USB-GPIB (I have no choice what hardware to use) though it works well with original program.

3. Wrong commands and termination characters - all of them are from my original program. I try different combinations for termination.

I see that all examples for Prologix use VisaSerial function but it is looks like people don't need to dig in Visa ASRL:: option, just.

I will provide the code on Mon. Thanks for your support .

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Dennis_Knutson — Sat, 07 Apr 2012 15:52:00 GMT

Keep in mind that unlike using a real GPIB controller, you will only get the com port listed when doing the find resource function.

Re: Quick Start Guide. GPIB in LabView . HW drivers. Application deployment

Mick_R — Mon, 09 Apr 2012 20:05:54 GMT

It looks like LabView string is not an array of char ! so when VisaWrite function parameter is "ID?\r\n"

I can see it in NI Spy - VISA Write ("ASRL3::INSTR", "ID?\r\n" )

that would be OK for C language but it is wrong for LV . where the buffer doesn't have CR LF in this case.

It needs to use string concatenation to add termination characters.

How to use FindList (array of string) returned by VisaFindRsrc to open Visa ? visaSession type ?