GPIB Ethernet/100 Performance

Does anyone have some real world peformance measurements on the transfer speeds of the NI GPIB-Ethernet/100 box. I am very disappointed in the performance of a block read which is approximately 6ms/byte transfer (tested from 20 bytes to 32kbytes block transfers). This is on a 100 Mb Ethernet. I can ping the box with 64 byte round trip transfers at ~0.7ms/packet.
I almost feel that the GPIB-Ethernet Box is not buffering my GPIB transfers.
Thanks

Actually ignore my question. My transfer speeds are ~6 microseconds/byte (not milliseconds!). This is still a little slower than I would like, but not totally unreasonable! Note the vertical axis in the included plot (pdf) is in ms, so the linear coefficient in the fit equation is 13 microseconds/(16 bit word).
Attachments:
GPIB_ENET_Plot.pdf ‏25 KB

Similar Messages

Is there a reason no one is using the Prologix GPIB-ETHERNET controller?

I am trying to control several Agilent HP-6033A power supplies and an HP-6681A power supply. I have a Prologix GPIB-Ethernet controller on each. I have done a search on "prologix ethernet" with zero results, however, there are a number of Prologix USB-Ethernet references. Is there a reason no one is using the Prologix GPIB-ETHERNET controller? This is a project I have inherited and I'm trying to troubleshoot some intermittent problems.
Thanks!

My group uses the Prologix GPIB-ETHERNET controller for controlling two Keithley devices in a Visual Studio 2008 .NET application. To achieve a sample rate under 200ms, we have to place one GPIB-ETHERNET on each Keithley device. The device was very easy to program using TCP/IP calls and required no drivers from Prologix.
On our latest application, we switched to the NI ENET-1000 because the Prologix device doesn't have a certificate like the NI ENET-1000 has. Unlike the Prologix, I must install the NI 422 driver and MAX. I can easily control two Keithley devices with one ENET-1000. Next week, I intend to see if I can control 4-5 Keithleys simultaneously in under 100ms.
No matter what the IP address of the computer is versus the Prologix, the Prologix net configuration utility can find the device. If the NI device is not in the same subnet, the computer cannot find it.

Preciso de um conversor de 4 a 20mA para GPIB. Voces fornecem

Gostaria de saber se vocês fornecem uma solução para medição de sinal de corrente padrão de instrumentação de campo (4 a 20mA) para protocolo IEEE 488 (GPIB). Um cartão de conversão ou algo deste tipo?

Acho que acidentalmente você colocou a sua pergunta no grupo de TestStand, que é um Software utilizado para automação de testes.
Basicamente a linha de produtos da National inclui entre outros produtos, instrumentos/placas para serem acoplados ao seu micro, chassis PXI ou fieldpoint bus.
Para leitura de correntes e tensões, a National Instruments oferece o Digital MultiMeter NI-4060 que é uma placa padrão PCI que quando acoplada ao seu micro pode efetuar leituras de corrente, tensão e resistência.
Na área de GPIB a National Instruments oferece placas GPIB e conversores de bus tipo GPIB-USB, GPIB-Ethernet, etc.
O catalogo online pode ser acessado a patir da página www.ni.com
Além disso, existe um grupo de discussão específico para instrume
ntos GPIB em exchange.ni.com. Em geral as perguntas são feitas em inglês, para que um maior número de usuários tenha acesso as perguntas e respostas.
Roberto Piacentini
Applications Engineer
National Instruments
www.ni.com/support

Serial vs Ethernet communication for gas analyzers

I need to control several Thermo gas analyzers through LabVIEW and each has an RS-232 port and an ethernet port. Has anyone does this kind of thing before? I just want to get a sense of which would be easier for programming and communication purposes.

First, have you done a search for an existing driver? You can go to the Tools menu and select Instrumentation>Find Instrument Drivers. The main page for drivers is the Instrument Driver Network where you can also do a serch and find resources on what a driver is and how to create one. With the VISA api, you can create a driver that will handle both serial and ethernet (or USB, GPIB, etc) with very little extra work. Look at the example driver that comes with LabVIEW - the Agilent 34401. This instrument has GPIB, Ethernet, Serial, and USB options. The only thing in the driver that is specific to a specific interface is one case statement in the Initialize function. VISA abstracts all of the differences in physical interfaces.

Instrument I/O Assistant not installed correctly

I've been troubleshooting this problem for over 2 weeks now and every response to this question that has found success I have tried, but was unable to fix the problem.
in labView, double selecting the I/O Assistant it reads the infamous text
"I I/O Assistant Not installed correctly or..."
I have downloaded the latest NI-VISA 5.1.3 (or the latest), NI-488.2. In order to install the NI-VISA I needed to find a .net 4.0 framework & Visual Studios 2003 or better. After this failed, I downloaded the DCD_AUG12_1 & 2_Downloaders. After that did not work it left me considering if my machine or equipment is the problem, or if the software is just unable to support these features.
My System Information includes
Windows XP 32 bit
Drivers Include:
8757d
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HP8753x
Connection Attempting:
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When launching labView I receive an error
"The web server cannot start. Is the webserver port already in use...
...labView Network Address is in use"
When trying to communicate with the machine connected to my computer, I can write to it, however I cannot read from or query information from it. NI says its connected just fine.
Lastly my NI is 2005 and Labview is 8.0
I am pretty novice in this equipment and technology. So if there is any specific details that I need to add, please let me know and I will update the post to include such details.
Solved!
Go to Solution.

RxTx,
It looks like you might actually have too new of a version of VISA. Please see the following KnowlegdeBase article for more information about which version you require:
http://digital.ni.com/public.nsf/allkb/E7C93038169B6E7686257847004B8B9C
It looks like VISA 4.3 is the newest version you can have for your version of LabVIEW.
Let me know if that fixes the issue!
Thanks,
Joel C
National Instruments

8051 based spectral analyser

Greetings,
I am working on a project that consists in creating a spectral analyser for the power line using the 8051 and the ADC0808 for analog to digital conversion. In the LabVIEW I am trying to sample the waveform of the power line and use the FFT algorithm to perform the spectral analysis with 0Hz to 2.5kHz of range.
Do you think that is possible to use this uC with no problems to perform this application with the Instrument I/O Assistant? Here is the screenshot that what I am trying to do.
Observation: The frequency of the desired signal that I am trying to sample is equal to 60Hz and the ADC0808 has a conversion time equal to 100us.
Thanks,
FBorges22
Attachments:
Spectra.PNG ‏32 KB

Borges -
The I/O Assistant is used to help you establish communication with serial, GPIB, Ethernet devices. It does not, however, process signals in any way. You should be able to establish communication without any problems using the I/O Assistant.
To perform an FFT analysis of your signal, you will need to use one of the many signal processing VIs in LabVIEW. There are express VIs that do Spectral Measurements as well.
I hope this helps
Bruno Noronha
Bruno Noronha
Certified LabVIEW Associate Developer
Using LabVIEW 8.6

Nwrfc 0.0.4 (Ruby wrapper for NWRFC SDK using Ruby-FFI) now available

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Hi Ned,
I've just tested your library. It took me a while to understand how to do it, as I never used SWIG before.
Anyway this is what I did:
0. setup a NI USB-6008 with some AA battery connected to AI0 (see attached photo)
1. installed Cygwin (I work on Win2000)
2. setup .paths in the "vimrc" file.
3. run "make -f Makefile.swig "
4. run "ruby test.rb"
It worked, but didn't show correct values. I changed settings inside the file, but still wrong numbers.
I then tried to run other examples and I couldn't run them (I guess the fault is on my side in ruby).
However I managed to run acquireNscans.rb , and it worked perfect.
It took me quite long time today to do. I tried to compile it without installing cygwin, then I compiled it in cygwin, but SWIG seems to be out-of-date, etc.etc. but at the end of the day I've got some results.
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[1.38554652487558, 1.37531881852636, 1.37531881852636, ...
read 10, total time: 0.907, rate: 11.0253583241455
Aborted (core dumped)
Is there any forum/topic where others discuss issues or work on the code similar to yours ?
What I am interested in is a library that would allow me to use Ruby or Php to communicate with devices through GPIB, Ethernet , serial port, etc.
Cheers,
Jakub
Message Edited by jcz on 02-15-2008 03:31 PM
Attachments:
DSC017791.png ‏360 KB

New Emerging Small Business - NI Alliance Partner - Servicing All of Florida

New National Instruments Systems Integrator now servicing the state of Florida. Our employees hold various NI certifications and come with several years of experience in LabVIEW and TestStand. No project too small. Look to us to outsource an entire test automation solution or simply use our associates during temporary times of increased capacity. Familiarity with custom protocols, GPIB, Ethernet, Serial, PXI, CRio, etc..
Check us out at www.mainlinetest.com and contact us via the following:
T: (321) 775-5866
E: [email protected]
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Using HP E2050 HPIb gateway with labview

Hi,
I was wondering if it is possible to use an HP E2050 Ethernet-HPIB
gateway (interface) with Labview. National Instruments has a similar
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possible to use the HP product since I have a whole bunch of them lying
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Thanks,
Prasun Chaudhuri

"Chaudhuri, Prasun [WDLN2:2M22:EXCH]" wrote:
>Hi,>>I was wondering if it is possible to use an HP E2050 Ethernet-HPIB>gateway
(interface) with Labview. National Instruments has a similar>product (a GPIB-Ethernet
interface), but I was wondering if it was>possible to use the HP product
since I have a whole bunch of them lying>around.>>Thanks,>Prasun Chaudhuri>
Prasun,
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Communication marche sous NIMAX mais pas dans mon VI

Bonjour,
J'éssaye de communiquer avec une alimentation en GPIB via réseau grâce à un adapteur GPIB Ethernet,
après avoir configurer mon adaptateur et les propriétés de la classe instrument j'arrive à communiquer avec mon alimentation via le panneau de test Visa de NIMAX en envoyant en write une commande puis en lisant la réponse en read ( le query ne marche pas ). J'ai éssayé de reproduire ce schéma dans un VI en prenant le soin de configurer les propriétés de la classe instrument de la même manière que dans le panneau de test, mais mon Read ne marche pas quand je l'éxécute . Sous le panneau de test le Read ne marchait pas non plus jusqu'à ce que j'active le caractère de termination \n et que je terminait toutes mes instructions par \n (j'ai fait la même chose dans le VI mais ça ne résoud pas mon problème ) .
Si quelqu'un a une piste je lui en serait très reconnaissant ,
Merci beaucoup,
Résolu !
Accéder à la solution.

C'est bon le problème est résolu.
Enfait le \n qui sous le panneau de test VISA s'écrit \n ne s'écrit pas ainsi dans le VI. Il faut concaténer la chaîne de caractère avec la constante LF

Rational rose and LabVIEW

I'm in the preliminary design stage of a task and I'm debating whether to use Object-Oriented design or Structured Analysis. I'm using LabVIEW with TestStand to control/test quite a bit of hardware (test equipment, I/O cards, VME, VXI, GPIB, ethernet, etc). The UML tool I have available is Rational Rose. Any thoughts/guidance?

Hi MrBean,
Although I'm no expert in the different design
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Dan Weiland

Using RX4 with Premiere on mostly edited project

Hello everyone,
I've been working on a full-length movie for some time, and have done all the audio processing using iZotope Alloy 2. Now the producer has purchased RX4 Advanced so I can take care of some clipped audio as well as clean up some ambience and reverb.
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Hello,
Wow, sounds like a pretty advanced high school class!
With regards to your question, the first thing to iron out
is exactly how the logging software can transfer data to your computer, then to
define exactly what you mean by “in realtime”.
There are several possible ways to transfer data from one running
program to another. Some of the more
popular ways are:
1) File IO – server writes data to a file, client reads data
from the same file
2) ActiveX – Microsoft technology that allows
sending/receiving data and automating programs
3) DLLs – half-compiled code allows a program to call code
created from another development environment.
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3) .NET frameworks – similar to ActiveX in look and feel,
but closer to DLLs in functionality.
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device and software through these means.
Next, what do you mean realtime? I presume you mean that you just want to read
the data from the device continuously and have only a very small delay between
each data transfer.
If you can get information on how you can transfer the
data, and how quickly you want to transfer the data I might be able to help recommend
a way to get the data to LabVIEW.
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Message Edited by Travis M. on 03-27-2006 04:16 PM
Travis M
LabVIEW R&D
National Instruments

LabVIEW driver for a ControlTechniques motor controller

Anyone know of LabVIEW driver for a ControlTechniques
Unidrive motor controller?
Or any info/pointers to programming them via LabVIEW?
Any help much appreciated
Paul
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Brill Engineering Ltd, 3 Longwood Court,
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LV can interface to 232, 485, Devicenet... depending on what the controller has.
You could find a LV/CVI driver for this (232/GPIB/ethernet only) instrument at http://www.ni.com/devzone/idnet/default.htm . If it's not listed there, it leaves you with one of a couple options. First, I would like you to submit a request for this driver at: http://zone.ni.com/idnet97.nsf/instrumentdriverrequest/
We develop drivers based on demand and popularity so the more requests we have for it, the greater the possibility that we will develop one.
If you would like to try developing your own instrument driver (or modify the existing one), we have documentation, model instrument drivers, and driver templates to help at :
http://www.ni.com/devzone/idnet/development.htm
We also have a syndicate of third party vendors that specialize in National Instruments' products and services. Some of the vendors specialize in driver development. I would suggest contacting one of the Alliance members at:
http://www.ni.com/alliance
An instrument driver is a collection of functions that implement the commands necessary to perform the instrument�s operations. In short, someone read the instrument user manual and implemented some of the functionality in a program for the end user. Instrument drivers are not necessary to use your instrument. They are merely time savers to help you develop your project so you do not need to study the manual before writing a program. With all of this work already done for you in the driver, instrument drivers can significantly reduce development time.
There are example VI's in LV on Instrument Connectivity. If you go to the Help menu >> Examples.. >> I/O, you will see a couple and Examples.. >> Fundamentals for File and String manipulation. I would suggest tweaking them to suit your application. Also the specific command that your instrument responds to can be found from it's manual.
Some useful resources for your application are
ni.com > NI Developer Zone > Development Library > Instrument Connectivity
http://search.ni.com/?col=alldocs&layout=TechResources&ql=a , to search examples and knowledge bases
Hope this helps.

How do I fix an "INVALID_REFNUM" error from DDE check?

I'm controlling a power meter with LabView using DDE. When I try to read the power with DDE advise check, I get an "INVALID_REFNUM" error. The refnum looks like a random 8 digit number. It comes from a DDE advise open icon, which takes a conversation refnum and outputs an advise refnum. The advise refnum is then wired through a shift register to go into DDE advise check. I have ensured that the number cooming out of DDE advise open is the same one that goes into DDE advise check. What can I do to fix this error?

There could be several problems here. First and foremost, the DDE driver might be hosed or might be buggy. Is there any particular reason you're using DDE to talk to an instrument? If the device uses a standard interface (serial, gpib, ethernet etc) it would probibly be easier--and more robust--to write the drivers yourself.
Second, are you trapping errors coming from the DDE Open function. If not you might be getting an error and don't know it.
Third, there might be some other related logic that is causing the problem and is pointing you in the wrong direction. Try writing a very simple VI consisting of an open, the check and a close. Nothing else, strip out all the extraneous logic or code. See if that works.
Another way of testing the DDE is to try c
alling it from a different environment such as Excel.
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Mike...
"...after all, He's not a tame lion..."
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 do I create a driver for custom equipment

Hello,
I have a current set up that I use to simulate a set up and then I have
that datalogged onto excel using a different piece of software. I would
like to create a driver for the set up and use it directly on labview
instead, but I'm having trouble getting started with that. Any general
information would be helpful.

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GPIB Ethernet/100 Performance