LV app as a GPIB instrument (non-controller)
Hi, I have a Labview-based measurement application that communicates with a GPIB-equipped mulitmeter. I would like to turn this application into a GPIB instrument itself, so that it can be connected to and run under our test executive. I have not made any LV apps acting as GPIB instruments before so I have some questions for you LV/GPIB experts out there: Is it a good idea to put another GPIB board into the computer and have the two categories of GPIB comm separated. (these two categories would be 1) the app. talking to the multimeter and 2) the test executive demanding measurements from the app.) Should I instead try to put both these GPIB communications on one GPIB bus? I have read about things like System Controllers and Controllers In Command (CIC). Any advice, examples and tips about where one can read about these things, are welcome! Andreas Nilsson, SP Swedish National Testing and Research Institute mailto:[EMAIL PROTECTED]
How can I display a TTL-Signal immpressed at a parallel port?
I get a real TTL-Signal from a resolver which is connected at the parallel port. From this parallel port I would like to read the frequency of the signal coming in. The resolver is connected at the parallel port at only one data pin and at a ground pin, without using a DAQ. (In past I used the InPort- Box of a example in developer zone, but it didn't work, because of the C-code) Thank you for your help, Bernd Franz
Re: Selling Useful routines
John, you asked on Mon, 14 Jun 2004 14:52:32 -0400: I have ... set of VI's to manage configuration files and parameter data as functional globals. ... I'd like to get some feeling for the most suitable way to earn some money this way. Selling routines without diagrams seems a chancy business for the buyer, since a LabVIEW version upgrade in the middle of a project can cause your program to stop compiling. Do people really send you money when they sell a program which incorporates a shareware component? Or do they just forget where they got it from. I would not just doubly reconsider buying a diagram-less toolkit. You should consider using password protection instead. Not that I would like PW protected components, but at least they usually provide the chance to take 1 to 3 major LV updates. How price sensitive are people? It's almost as easy and surely more satisfying to sell 10 copies for $200 as one for $2000. I have no problem buying tools for up to about 50 or US$ just out of curiosity and based on freely availabel (ad?) info. Have also bought some SW for up to 150-180 , but this has to provide a demo or try-before-buy version in order to check out its value. Cause I know your name and your reputation from this list, I'd believe your description of what this tool could serve me with. But I still would consider a limit of about 150 to 200 to be a major stop. I have, however, the feeling that selling tools around LV is a hard job. The knowledge behind a toolset is often not really valued. And as people have different asumption on how any give function empirtically works, you have to provide a good documentation and help files and so on. This takes its share of work too. Please keep the list informed! Greetings from Germany! -- Uwe Frenz ~ Dr. Uwe Frenz Entwicklung getemed Medizin- und Informationtechnik AG Oderstr. 59 D-14513 Teltow Tel. +49 3328 39 42 0 Fax +49 3328 39 42 99 [EMAIL PROTECTED] WWW.Getemed.de
Insert Teletext
Hi all, I am sending this mail again as I did not receive any response for my previous posting. I have an application wherein I have to insert teletext or video images during the vertical blanking interval of the composite video signal. I am looking at NI 5431 Video signal generator card which can test Television broadcast equipments. Any information on how to insert Teletext using NI 5431 or any other NI/ Non NI card will be of great help. Thanks in advance Best Regards Bipin M Application Engineer, Captronic systems Pvt Ltd. Koramangala I Block, Bangalore-560 034 #+91-8025535046,25526961 www.captronicsystems.com
Re: Insert Teletext
- Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Tuesday, June 15, 2004 8:59 AM Subject: Insert Teletext Hi all, I am sending this mail again as I did not receive any response for my previous posting. If you don't get a reply, it generally means nobody knows. Your messages on the list go to you as well so you get confirmation that it's gone through OK and everyone else has seen it. You're going to have to dig out precise specifications and do it yourself. Do you understand how to generate a test pattern on a line by line basis using the card? I don't mean by loading an example VI. From there you know how to generate an arbitrary line. Then you need to sort out how to encode basic teletext data. Then you need to work out how to get the data from the files you have. -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/
Can I resize function icons on the diagram ?
I want to publish a diagram on a journal. Unfortunately function icons (like the sum operateur) are too small. After printing it is thus not possible to read correctly the diagram. Is it possible , like for objects on the front-panel, to resize objects on the diagram (line connexions and operators) ?
While loop in subVI
Hello I have a doubt about using while loops in VI and subVI. I have a VI, with two loop that are executed in parallel, and stoped with the same button, by using property nodes and references. One of the while loop executes a subVI. If the Block Diagram of the subvi there is a while loop covering all the code, it's the same to put it in the main VI with another while loop, or it's not necessary? it's the same if this subVI has a while loop covering itself that if the subvi doesn't have this while loop because the loop is in the same VI? Thank you very much
HSB --- RGB in LabVIEW ?
Hallo, I'm looking for some vonversion VIs or function to convert RGB color values into HSB color values and vice versa. Can LabVIEW do this by default or does anyone know if anybody has written anywhere in the world something like a Color toolbox. I'm running LV7 Express Thank you Oliver Friedrich
Re: DDE in loop
Hi LV Newbie, The answer that the other user posted on the forum is what you need. I have access to a copy of Labview 5.0 and I'll try to convert his code to 5.0 for you. Chris M National Instruments (UK)
search special character
How to search for special characters (peculiars) in the developer exchange, e.g. [ ] or whole phrases like controls[] Stefan Pofahl
Re: How can I display a TTL-Signal immpressed at a parallel port?
You also can use the serial read function or VISA read function to read the parallel port. But before you have to set a porrt no. for your LPT in the labview.ini to access to the LPT. This is documentated somewhere on ni.com. wimmer franz wrote: I get a real TTL-Signal from a resolver which is connected at the parallel port. From this parallel port I would like to read the frequency of the signal coming in. The resolver is connected at the parallel port at only one data pin and at a ground pin, without using a DAQ. (In past I used the InPort- Box of a example in developer zone, but it didn't work, because of the C-code) Thank you for your help, Bernd Franz
Re: problem with 2 COM ports working parallel
It is not so easy, because the applcication is realy complex, so I have to reduce it a lot. But I can tell you so far, that the the write commands to the two COM ports happens nearly at the same time. Maybe windows does not like this. So I will change the timing. Unfortunatly I does not have the time to do this now. I will post again with an detailed description an a reduced vi, if the problem still occures. Thanks so far, Niko JoeLabView wrote: Can you attach a copy of the portion where the COM port communication takes place? Do you verify if there is (more) data at the port waiting to be read? or even a delay between sending the command and the expected response? By seeing how you implemented the communication, we can better provide some ideas or solutions. Regards, JLV
Fw: Ramp meter.
- Original Message - From: Daniel Alejandro Moyano [EMAIL PROTECTED] To: Info LabVIEW Mailing List [EMAIL PROTECTED] Sent: Thursday, June 10, 2004 7:49 PM Subject: Ramp meter. Hello very nice people: In a virtual instrument, I have choosed a numeric meter for the front panel. It is configurated with RAMP (from Item visible). But this ramp just has 3 colors, and I would need 6. How can I do to add 3 colors to the ramp? Daniel
Re: arithmetic average with LabVIEW 6.1
The easiest ways are always the best !! Thanks for helping me.
Re: running under fedora 2 kernel 2.6
Dear LouisP, Thanks for your help. I've upgraded to Labview 7.1 but I still get the same problem. Labview crashes with error message: LabVIEW caught fatal signal 7.1 - Received SIGSEGV Reason: address not mapped to object Attempt to reference address: 0x27ebe4f4 Segmentation fault
Re: If i use a sub-vi 3 times simultaneously in my main program....
if i make my sub vi's as reentrant, do I lose any process speed, in other words are there any limitation for using the reentrant execution? and thanks for your reply.
Re: 2d cross-correlation (for image correlation): some questions
Hi Michael: Thanks for looking at this for me. The other issue is that when I use the IMAQ VISION cross-correlation fx (which allows me to do direct image correlations without having to do the fft steps), I get different answers than what I get with my LabVIEW routines. I believe that most of this just has to do with scaling but because I cannot see the 'c' code of any of the routines, I am not sure. I tend now to trust the IMAQ VISION routine more because when i correlate two identical U8-format images, I get a cross-correlation maximum of 256 (which I expect to be the maximum possible value for a U8 type image). Then when I correlate two non-identical images, or use subset images, I always get less than this for the maximum. My goal was to implement this procedure without IMAQ Vision since that is the only place I would need Vision for this code. I would appreciate it if you might be able to have one of your math gurus right at NI take a look at this. Any chance of this? thanks, Don
Re: Fw: Keystrokes
Nuno asked: ... any help on sending keystrokes to other application? I'm attaching (private email only) my collection of snippets from this forum about capturing and forwarding keystrokes. -- Paul F. Sullivan SULLutions (781)769-6869 when a single discipline is not enough visit http://www.SULLutions.com
Re: Reusable Code
how about using the subpanel feature? create 20 subpanel vis for your setups an splash them on your screen?
Re: How do I create an emergency stop custom control in LabVIEW that looks like an actual E-stop button
Thank you very much
Re: How do I create an emergency stop custom control in LabVIEW that looks like an actual E-stop button
The Application Note on Custom Controls is most helpful - thank you also.
Re: Reusable Code
And yet another idea Use a tab control or a set of tab controls. You can drive a single tab control with 20 tabs for 20 views, or use 20 single page tab controls. Ben
Re: If i use a sub-vi 3 times simultaneously in my main program....
My NO was to Mudda Q. I am the same page as Ed. Ben
Re: If i use a sub-vi 3 times simultaneously in my main program....
If the subvi does not contain data that are dependent on a previous run , such as local variable or shift register data, then there is no need to make the vi reentrant.
Re: Important question: I have got a PXI-4472 and I am able to...
First: yes, the operation is correct. Second: yes again. When you consider a multi-channel acquisition, your sampling rate must be shared among the channels. Third: when you specify a list of channels you want to acquire from, the channel considered for analog triggering is the first you put in the list. Connect the error clusters whenever you can,in particular when you are dealing with I/O operations. Bye!
Re: Can I resize function icons on the diagram ?
Hello, You can modify the view of functions in diagram by right-clicking then selecting view as icon. Nevertheless,this option is only available for VI express and standard functions. Standard functions are functions which have this own diagram and front-panel. You cant expand simple arithmetic functions such as multiply. Moreover, you need LabVIEW 7 to use this option (view as icon). Hope this help. Isabelle Jean National Instruments
Re: If i use a sub-vi 3 times simultaneously in my main program....
No! You may pick some up. What you will loose is debugging. The main gotcha is the seperate memory space issue mentioned earlier. This means that if your sub-VI's use local storage (like shift register that store results from the last call for use in the next) are distict for each occurence of the sub-VI in a diagram. Also, if your sub-VI use larege amounts of memory the use will be duplicated between each instance. Ben
Re: If i use a sub-vi 3 times simultaneously in my main program....
As far as I know, making a subvi reentrant would have no performance difference over having multiple VIs with different names. Maybe an app eng could verify this. Each time a reentrant VI is called from a new location in the code, it creates a separate area for it in LabVIEWs dataspace, the same as calling a new subvi would do. Ed
Re: error using coupling property for analog input in LabVIEW DAQ
You get the unsupported error because the daq card you're using does not support AC coupling. It is DC coupling only.
Re: Case Statements
Thanks for clearing up my mistake. Kura Altenbach is correct. After reading your question again I realize I was wrong. sorry for that, thanks again altenbach.
Re: If i use a sub-vi 3 times simultaneously in my main program....
If the sub-VI is CPU intensive, and you do not want one call of the sub-VI to delay another call to the sub-VI Then re-entrancy is very useful. Ben
Re: How do I fit a curve with two independant variables
The model equation (where x is a function of C and of T) is as follows: x=K1+K2/(C+K5*T*C)+K3/(C^2+C^2*K5*T+C^2*K5^2*T^2)+K4/(C^3+2*C^3*K5*T+2*C^3*K5^2*T^2+C^3*K5^3*T^3) The example that you kindly provided would not open due to an error message stating that I needed LabVIEW 7.1: I am running the 2004 Feb upgrade (we did not renew the service in May - yet.) I have noted in the Polynomial Fit VI that there is a model equation that may be edited but I have not found a discussion of how one should formulate such an equation for use by LabVIEW.
Re: Can I resize function icons on the diagram ?
I want to publish a diagram on a journal. Unfortunately function icons (like the sum operateur) are too small. After printing it is thus not possible to read correctly the diagram. Is it possible , like for objects on the front-panel, to resize objects on the diagram (line connexions and operators) ? I think you probably want to take the picture of your diagram to a quality image editing package and enhance it there. You can resize the bitmaps using a smoothing or antialiased resize, and crop it to show the portion you are interested in. This will also be much faster and easier than trying to resize individual elements of the diagram. There are lots of ways to get images of diagrams, bitmaps, printing to postscript, etc. If you have more specific questions, please ask again. Greg McKaskle
Re: While loop in subVI
If the Block Diagram of the subvi there is a while loop covering all the code, it's the same to put it in the main VI with another while loop, or it's not necessary? it's the same if this subVI has a while loop covering itself that if the subvi doesn't have this while loop because the loop is in the same VI? If I understand your question correctly, the answer is yes. A loop around code is the same as a loop around a subVI containing the same code, is the same as a subVI containing a loop containing the code, ... There will be slight performance differences, but very small. Greg McKaskle
Re: Insert teletext
Bipin, You need to look at what you want to do in more detail I think. First off I do not think the NI 5431 will be able to take the .trp files in a MPEG-2 format and generate composite video test patterns. You will have to convert the files to the format needed by the 5431. Second to insert teletext you may want to look at a PCI card from Cebra Technology at http://www.cebra.dk/ You can run the output of the 5431 through this card and generate any teletext you want. The board has a SDK that provides an API. Good luck, David David Stewart, P.E. President CDS Engineering Solutions, Inc. email: [EMAIL PROTECTED] V: 678-232-3706 F: 770-925-1497 Bipin M wrote: -- Subject: Insert teletext From: [EMAIL PROTECTED] Date: Mon, 14 Jun 2004 12:48:51 +0530 Hi all, I have an application wherein I have to insert teletext or video images during the vertical blanking interval of the composite video signal. I am looking at NI 5431 Video signal generator card which can test Television broadcast equipments. Also the test signals are in .trp file (MPEG-2) format. Any information on how to insert Teletext using NI 5431 will be of great help. Best Regards Bipin M Application Engineer, Captronic systems Pvt Ltd. Koramangala I Block, Bangalore-560 034 #+91-8025535046,25526961 www.captronicsystems.com --
Re: Fw: Ramp meter.
Although it isn't as convenient as having the feature built in, you can paste any graphic you want into LV's ramp control. Simply design the color ramp you want in your favorite graphics program, save it to a file (.gif, .png, .jpg, .bmp) then use Edit Import Image from File to put that image in your paste buffer. You can then either paste the graphic over the ramp or customize your ramp control and make the graphic part of the control's background (see example programs that ship with LabVIEW keywords animated controls). Using this you can have 4, 6 or as many colors as desired. Pojundery, Stephen R. Mercer -= LabVIEW RD =- |-+ | | Daniel Alejandro| | | Moyano | | | [EMAIL PROTECTED]| | | | | | Sent by: | | | [EMAIL PROTECTED]| | | .nhmfl.gov | | || | || | | 06/15/2004 07:20 AM | |-+ --| | | | To: Info LabVIEW Mailing List [EMAIL PROTECTED] | | cc: | | Subject: Fw: Ramp meter. | --| - Original Message - From: Daniel Alejandro Moyano [EMAIL PROTECTED] To: Info LabVIEW Mailing List [EMAIL PROTECTED] Sent: Thursday, June 10, 2004 7:49 PM Subject: Ramp meter. Hello very nice people: In a virtual instrument, I have choosed a numeric meter for the front panel. It is configurated with RAMP (from Item visible). But this ramp just has 3 colors, and I would need 6. How can I do to add 3 colors to the ramp? Daniel
Re: If i use a sub-vi 3 times simultaneously in my main program....
In principle, Yes, However, how much true that is depends on how LabView (R/D)developers are implementing it, and things have been changing between LabView versions, to different degrees, all the time.
Re: I have a problem using COM
Hi Chris As promised I have done some further investigation. If I remove the vi that registers all the events and associates the callback vi's with an event then the app closes down ok. It looks as though the callback vi's themselves are not closing down.
Re: search special character
How to search for special characters (peculiars) in the developer exchange, e.g. [ ] or whole phrases like controls[] Some of the search functions do not use regular expressions or wildcarding and you can simply search for the phrase. If you are using match pattern, which does use regular expressions, you will want to escape the special characters by preceding them with a \. To search for [] you would search for \[\] Try it out in a simple example to learn how it works, and be sure to click the more help and read the manual page on this node as it is full of features. Greg McKaskle
Re: If i use a sub-vi 3 times simultaneously in my main program....
Yes sir! From what I have read about LV 7.X and hyperthreading, two of these re-entrant sub-VI's can be executing simultaneously without having to resort to dual-proccessors. Ben
Re: Returning an array of strings to LV from activex.
I have an ATL project on the go which returns an array of strings to labview, which is working fine, with no problems, exept I cant 'probe' the returned VARIANT data for some reason, so me thinks its the wrong variant type!, but it works :) Is it a variant containing a safearray of type BSTR that labview is supposed to recieve ? If I setup a simple test vi with stringArray-toVariant-indicator, I can see the strings OK. I think the thing confusing you is that the LV variant isn't exactly the same as the OLE variant. The LV variant can be any LV type, or any OLE type including an OLE variant. So, the variant probe in LV will often show you just a little bit about the type since it doesn't really know enough about how to display it. If you can use the To G Data node to convert the variant to your type and then probe or display in indicators, then everything is working fine. Without the extra typing information provided by the To G Data, LV just doesn't know enough to make a decent probe, at least not today. Greg McKaskle
Re: I have a problem using COM
Hi Stephen, Thank ypu for the extra files and information. I've been investigating your code further and I understand from your comments that the problem lies in the 'InletKernel_RegisterAllEvents2.vi', is this correct? However I still need the .dll, executable or control which supplies 'InletKernelInterfaceLib.IInletSystem2' to continue my investigations as I do not have that on my installation and it appears to be part of you application. With that file I can follow the callbacks events through and hopefully find where the problem lies. Best Regards, Chris M Applications Engineer National Instruments (UK)
How can I control PIC programmer with LabVIEW
I need to control a PIC Programmer (MPLAB PM3) with LabVIEW. How to do this?
Re: Creating an exe with 6.1 and VISA
Hello, NI-SPY is installed with NI-488.2, NI-CAN, and NI-VISA. There is however a known issue where if you install NI-VISA 3.1, the first time you run the installer NI-SPY doesn't get installed, but if you run the installer again it will install NI-SPY. Hope this helps! Regards, Steven B. Applications Engineering National Instruments
Re: I need to read an unsolicited serial variable string.
Thank you for the response. I have the capability to reprogram my serial device to output any format. What format would be preferable from a LabVIEW point of view?
Re: switch 1127
What is the problem with niswitch_32.dll?
Re: Can't use the Measurement Automation Explorer in the dl eval version
Can I download an evaluation version of MAX? I'm trying to setup an application to read measurements from a Micrometer and show them on display and save to disk. I really need to setup a working example so I can convince my company to buy the software.
close datasocket connection
Hello It's the first time I use DataSocket, and DataSocket server. I have developed an application, using the examples DS Writer and DS writer as a base. In my application one of the subVI has a while loop, and is subscribed to a DataSocket variable. When I stop this subVI from the Main VI, whith a button, using references and property nodes, it doesn't stop, and I have seen that the process keeps on connected. How can it be? How can I solve it? Thank you all for your help.
Re: How can I control PIC programmer with LabVIEW
Check the following link: http://www.calbay.com/ProgramIC%20Data%20Sheet.pdf This toolkit might support the PIC Microcontroller. Robert
Re: If i use a sub-vi 3 times simultaneously in my main program....
Thanks to all of you for your comments, Mudda.
Re: I need to read an unsolicited serial variable string.
Thank you for your assistance. You have been very helpful. Cheers!
Re: how to control the subvi front panel
Hey Fred, There are two different VI Server properties that I think may be useful to you. If you haven't used VI Server before here's a link to some general information on it. a href = http://zone.ni.com/devzone/learningcenter.nsf/03f7c60f17aad210862567a90054a26c/371c4fea97121ea686256c4e0062de8a?OpenDocumentProgrammatically Controlling LabVIEW/a VI Server basically allows you to programmatically control a VI. One property that may be helpful to you is the Execution:Show Front Panel On Call Property. This property will allow you from your main VI to control whether a subVI's front panel is shown when it's called. Another property is the Front Panel Window:State Property. This property determines the state of the front panel of a VI. For example, you can make the front panel of a VI hidden. Please refer to the help for these properties for more information about them. I hope this helps! Sarah Miracle National Instruments
Re: I need to read an unsolicited serial variable string.
Baud, stop bits etc. is purely personal preference. LAbVIEW can read in basically any format, but I have a personal preference for tab seperators between values and newline/carriage return as a termination. This way the text can be streamed to a text file and is readable afterwards in Excel usw Hope this helps Shane.
Re: Passing data from subvi's several levles down to top level vi
Is 100 msec too slow? I have loops that update the indicators this fast.
Re: Reusable Code
Err.. alright, but how do I get all of the property nodes into a subvi?
API's drivers
Hello. I'm already a bit confused when reading about drivers and APIs... What's the difference between an API and a driver???(because sometimes texts refers to some of them without distinction). Once known the difference, which is which? NI-DAQ is a... driver or API??? And this for NI-DAQ, NI-DAQmx, NI-SCOPE, NI-FGEN, NI-DAQ 7. For what I think I understand NI-DAQ and NI-DAQmx are both drivers and APIs, and NI-FGEN and NI-SCOPE just APIs. If I'm not wrong, why 2 APIs for one driver??? Thanks.
create an application with Labview 7 express
how to create an application which can run without the motor of Labview. I have the developper toolkit and application with I can build run also with the motor of labview on the computer Is it possible to crreate an application which can run without this motor?
Re: Creating an exe with 6.1 and VISA
I can't run VISA 3.1 because the target system is W98. I installed VISA 3.0.1 run-time. Is NI-Spy included in the run-time? It doesn't appear on the start menu or in the add/remove programs panel. -Jim
Re: application builder is missing in labview under tools
Hey Paul, DD is correct the full system does not include the application builder. Refer to the following link for a comparison of what the different versions include. a href = http://www.ni.com/labview/how_to_buy.htm#compareCompare Development Systems/a If you have questions on the different versions or want to purchase application builder separately please feel free to call our sales department at (888) 280-7645. Also who did you contact about getting the replacement ethernet card? If you contacted technical support and have a service request you can always call back at 1866 275 6964 and enter your service request and you'll get routed to the person who originally took your call. If you contacted sales you could call the sales number above and they could put you in touch with the sales person in your area or the person you talked to previously if you know their name. I hope this helps! Regards, Sarah Miracle National Instruments
Re: close datasocket connection
brDo you close the DataSocket connection using the bDataSocket Close/b function and by passing it the connection ID? If not, do this outside the While Loop. Regards, iKhalid/ip
Creating reference of a subpanel to pass to a subvi
It does not appear to be possible to creat a reference to a subpanel (to pass to a subvi). Can someone confirm this? Can a subvi in anyway access the subpanel of another vi? This will make my code much more object oriented. Does anyone else feel this is a desired feature? Thanks. Zuolan
Re: While loop in subVI
br Hello, I hope I understood you correctly... In general, it's better to use sub VIs to organize and modularize your code. So, if you can separate part of the code into a sub VI, do it. And if your main VI is calling the sub VI in a loop, the sub VI executes every iteration of the loop. So, you do not need a loop in sub VI, normally. But it depends on what exactly you are trying to do. Use the Execution Highlight mode (the light bulb on the diagram toolbar) to see how the code gets executed, and make changes accordingly. Regards, iKhalid/ip
Re: Error opening file:The file XXX.vi is not a VI. Select Another? Whats wrong?
Anyone can take any file and rename the extension to *.vi. This still does not make it a VI, right? You need to ask the author of the files what they are. There is no other way. Have you tried opening them in notepad to get some clues? (a true VI file typically starts with a few upper case characters followed by lots of garbage sprinkled with a few text words. (What are you trying to do? Are you actually trying to open a VI program for editing or running? Some users of my labview applications sometimes make the following mistake, maybe that's your problem: I have a button to read in a new spectrum file, but I usually leave the standard menu bar intact. Sometime, if they try to load a new spectrum, they mistakenly do a menu..file..open, (instead of pressing the button) then selecting a new spectrum. Of course this will get the error that abc.dat is not a vi or similar. The menu item file...open is strictly for opening VIs.
Re: Subpanel.vi
Phil, The help file suggests that the main vi has to be running to prevent the subvi from being removed. You can add a pause at the end of the program so that it can be viewed. Or it might be possible (I don't know how) that you grab a picture of the front panel of the subvi and overlay it in front of the subpanel before the program exits. Zuolan
Re: OPC et Drive Server OPC
Bonjour, Les VIs dits de compatibilit=E9 se trouvent au chemin suivant: C:\Program Files\National Instruments\LabVIEW 7.0\vi.lib\platform\dataskt.llb Vous trouverez =E9galement des exemples standards de programmation OPC/DataSocket dans LabVIEW: Menu Aide Recherche d'exemples... Cat=E9gorie Networking DataSocket OLE for process control (OPC) Exemple Multiple OPC Items Monitor.vi qui utilisent les VIs DataSocket dits de compatibilit=E9. Ceci devrait vous aider. Cordialement. Matthieu Gourssies
Re: How do I determine the fastest data acquisition speed (Hz) a user can select in program?
Hello! The main factor that determines how fast you can acquire is the type of data acquisition board that you have. In the user=92s manual of your board, under the specifications section, the maximum sample rate is listed and you cannot go any faster than that. Once you have written your data acquisition program, its size also determines how fast you can acquire, because time is needed for every function in your program to be executed. Keep in mind that this is system dependant (processor speed, memory, etc.). You can benchmark your program as Herbert suggested. I am including some links that can help you do this. a href=3Dhttp://digital.ni.com/public.nsf/websearch/0E7EA68BFB2BCD37862562A80= 073708D?OpenDocumentHow do you determine if you are acquiring data too fast or doing too much processing during a continuous data acquisition?/abr a href=3Dhttp://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=3DC= EA0BF441BE67507E034080020E74861p_node=3DDZ52303p_source=3DexternalBenchm= arking Multiple E-Series or PCI S-Series Boards and Writing to Disk/abr Hope this helps! Sylvia V Applications Engineer National Instruments
Re: create an application with Labview 7 express
Every built LabVIEW application requires the run-time engine installed. Just like the on-line help states. Much older versions of LabVIEW included the run-time engine in the executable which resulted in large exe files. Now, the exe's are smaller but the engine is still required. A separate engine is a big benefit when multiple exe's might be installed. The installation of the run-time engine can be made automatic when you create an installer for your app.
processing of aquired signal during aquisition (arrays?)
Hello, I'm aquiring a voltage signal from a thermistor using DAQ and Labview. I'm using for-loop in Labview for that. Is it possible to take my previous readings of the voltage signal (through A/D channel), say, V(i-1), compare it to its current value V(i) and if a comparison condition holds - freeze V(i-1) and feed it continuously to a D/A channel,etc. I'm basically trying to work with arrays in Labview, but can't get the voltage array previous values during the aquisition and manipulate with it during the aquisition. Thanks.
How can I easily step through Matrix Combinations in Labview 7.1?
I have a 2D matrix of test parameters that I'd like to step through, hitting all possible combinations. I'd like the system to be dynamic so that I can input a matrix of any size. The obvious solution is to use nested for loops, but I don't think that will allow me to handle dynamic matrix sizing. Any help would be appreciated! Thanks! Neville
RE: VI Server error 63
Just a thought but if this is starting Labview after a Boot, perhaps it is starting Labview before the network services are completely up and running. In other words maybe this is not truly a server issue, maybe its all within the remote box. Just a thought... Rick M LMC Syracuse NY -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jason Dunham Sent: Tuesday, June 15, 2004 1:34 PM To: LabVIEW Mailing List Subject: VI Server error 63 Hi I have two remote systems which are supposed to remain connected with VI Server. Sometimes, when one computer starts LabVIEW and tries to connect, it gets error 63, connection refused by server. Since the systems are remote, I'm having a hard time figuring out exactly what causes the problem. The systems usually connect, so it should not be a allow/deny problem or any other VI Server config problem. Has anyone else seen similar problems or have some advice? Jason Dunham SF Industrial Software, Inc.
I need some documentation of wire data types
I am new to LabVIEW and I am having trouble finding some information. Specifically I would like to know what the different wire data types correspond to on the block diagram. For example the thick pink wire is for errors, etc. The manual says to look at the Quick Reference Card for this information but the Reference Card only lists some keyboard shortcuts concerning wires. Can someone please point me towards this information? Thank you.
How to use Digital output to turn on sensor for Analog Input?
I am trying to use a digital output to turn on an array of sensors that I then wish to read on 16 analog input lines. I have a 6024E DAQ card. I am planning to take data at 10-20 hz, so not terribly fast, but I will be acquiring for long periods of time (days) so I will be streaming data to disk. I have a fair bit of experience in Labview basics, but can quickly get out of my depth when I try something new (like this). I have V6.01. It looks as though the best way might be to do the DO and then a single AI as individual events, then write to disk and continue through the loop. I am puzzled, however, how to keep this cycle on schedule given that I don't know how long it will take to sample 16 channels, write the data to disk and get back to the starting point... perhaps this is so fast that I don't need to worry about it? The actual timing of the samples (be it 10 or 20 hz) isn't too critical, as long as I can record at what time they were taken... it would be frustrating to find that I was several seconds off after days of data.
Re: I need some documentation of wire data types
And while you are playing around, switch to the wiring tool with the help window (ctrl-h) open. Floating over the wire will tell you exactly what is in the wire. Ben
Re: Compatibility issue with PXI1031, 64bit processor and windows xp
LabVIEW does not yet officially support 64 bit XP. We have done some basic testing, which indicated that the environment generally runs, but we have not tested extensively, so it's quite possible that there are bugs or unexpected behavior. Regards, Ryan K. NI
Re: Compatibility issue with PXI1031, 64bit processor and windows xp
Hello, National Instruments does not currently offer or support products that are certified for use with 64-bit processors and corresponding Windows operating systems. Note that the 64-bit versions of Windows are not compatible with previous 32-bit Windows drivers. All National Instruments hardware drivers currently offered for Windows XP are based upon 32-bit technology and thus will not function on 64-bit Windows. If you have a strong desire to use National instruments hardware on 64-bit versions of Windows, consider one of the a href=http://sine.ni.com/apps/we/nioc.vp?cid=11737lang=US;NI Driver Development Kits/a or a href=http://sine.ni.com/apps/we/nicc.call_me?p_action=countryp_lang_id=US;contact your NI Sales Representative./a Though all hardware and software products are not supported at this time in the 64-bit structure, the basic programming functionality of LabVIEW has been observed to passably function. Do you see a common reason for the LabVIEW crash? How often do you see the crash? Perhaps with more information we can grow to more effectively support the 64-bit operating systems. I hope this helps! Please let me know if there is anything else I can do. Liz F National Instruments
Virtual memory
Hi, I get this message sometimes when I run my program: System is low on virtual memory My program has two loops, and I use shift registers on these two loops. I have a loop for data array and a loop for graphing the data array. My data when put into excel is more than 1500 rows. Is it giving me error because the data arrays are big and so it runs low on virtual memory? Is there a way that I can dump this memory to a physical memory space, then read back memory and then write to Excel? Right now, the program keeps concatenate the array, then puts all that data into Excel at the end. Thanks, Ann
Re: Is the SVT Zoom FFT really more accurate than a regular full FFT with a large sample?
a href=What are the basic differences between Baseband, Subset, and Zoom FFTs and when should I use each?What are the basic differences between Baseband, Subset, and Zoom FFTs and when should I use each?/a Enjoy!!
The sub VI does not pass statistic vi data to the main VI numeric indicators.
The subVI is a Daq AssistantVI with a Statistic VI. Numeric indicators are wired to the statisic VI. A graph indicator is also wired to the signal from the Daq Assistant. The SubVI works by itself. Can not figure out why the numeric indicator and graph, that are wired to the connector pane, do not worked when wired to numeric indicators and graph in the main VI.
Re: I need some documentation of wire data types
Thank you.
Re: mozilla
Hello Emiliano - What version of LabVIEW and what Platform are you using? Refer to the LabVIEW Release Notes for the version of LabVIEW you are using for the required version of Mozilla. Also, if you installed Mozilla in the default location, the LabVIEW installer automatically installs the browser plug-in. Otherwise, to manually install the LabVIEW plug-in, install the LabVIEW Run-Time Engine, then copy /usr/local/lib/labview/lvnplugin.so to the plug-in directory. SVences Applications Engineer National Instruments
system low on virtual memory
Hi, I get this message sometimes when I run my program: System is low on virtual memory My program has two loops, and I use shift registers on these two loops. I have a loop for data array and a loop for graphing the data array. My data when put into excel is more than 1500 rows. Is it giving me error because the data arrays are big and so it runs low on virtual memory? Is there a way that I can dump this memory to a physical memory space, then read back memory and then write to Excel? Right now, the program keeps concatinate the array, then puts all that data into Excel at the end. Thanks.
Re: UDP problems when building executables
There could be a number of reasons for this behavior. It may be that the function is not working properly on the run time engine (RTE). The best fix for this is to see if the problem persists in LV 7.1. It is the best version of LabVIEW to date. If you can post code that shows the problem then it can be tested in other versions. Your executable may not have all the settings that are in the development environment. The follow KB discusses a solution: a href=http://digital.ni.com/public.nsf/websearch/65F76F247012DF68862562C70073BE06?OpenDocument;Setting LabVIEW Preferences For a Windows Executable/a Lastly, UDP is a lossy protocol by definition. Consider using TCP instead if the losses are unacceptable.
Re: Cannot open Labview 7 without not enough memory error
I figure there are two possiblities. LabVIEW is poorly installed on your system causing the error or your VIs are corrupted. You can test the former by installing LabVIEW on another computer. If you can open the VIs there, consider contacting NI for ways to more throughly remove NI products from your machine. To test the latter, see if you can create new VIs in 7, save, close, and reopen them. You can also see if other VIs on your machine open. If your VIs are corrupted, then try to open them in your older LV, copy the Block Diagram over to a new VI, save, and open in LV 7.0. At the very least, you can get a screen shot of the diagram. Good luck!!
Wanted: #define
From my days as a C programmer (shudder) I have to say I do miss the #define. I realize LabVIEW cannot really have an exactly analogous feature because the scope of .vi is too different from the scope of .c, but there must be some way to get the same functionality. I figure a global might be the ticket here, but I thought I would ping you guys and see if anyone had something more clever or if there were any gotchas to using a global. I would type my #define values into the global, make current values default, and then read from the global. This particular global would never get written to programmatically. George Gatling Applied Technology Division, SFA Inc. Space Physics Simulation Chamber US Naval Research Laboratory 202-404-5405 (phone) 202-767-3553 (fax) If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason. --Jack Handy
Re: Wanted: #define
Hi; I think config files can also be considered. You can initialize a particular variable (I32, Bool, etc) using config files Just my thought + Dr. Hamid R. Yazdi Federal Mogul Manufacturing technology 3935 Research park drive Ann Arbor, MI 48108 Tel: 734 222 4108
Re: Virtual memory
Lai, Ann wrote: Hi, I get this message sometimes when I run my program: System is low on virtual memory My program has two loops, and I use shift registers on these two loops. I have a loop for data array and a loop for graphing the data array. My data when put into excel is more than 1500 rows. Is it giving me error because the data arrays are big and so it runs low on virtual memory? Is there a way that I can dump this memory to a physical memory space, then read back memory and then write to Excel? Right now, the program keeps concatenate the array, then puts all that data into Excel at the end. I believe that the concatenate array function makes a new, slightly larger, copy of the original array to add your new data on to the end, then deletes the original. It's a little smarter in that it adds more space than you need to reduce the number of times it has to do this, but it's still slow and memory hogging. It may be one of your problems. Initialise the array at the start and replace null entries with your data as you go. You could also use a more elegant design that doesn't buffer all the data before starting to write to Excel- a queue to a seperate Excel writer for instance, unless the machine overhead isn't acceptable. Another may be that Excel's not very good. There are better packages for data manipulation- Origin for example. Or maybe Diadem if you want to stay NI. -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/
Re: Wanted: #define
[EMAIL PROTECTED] wrote: Hi; I think config files can also be considered. You can initialize a particular variable (I32, Bool, etc) using config files Just my thought strict typedef? -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/
Re: Error opening file:The file XXX.vi is not a VI. Select Another? Whats wrong?
The author of the files is a professional who wrote a program for me a couple of years ago. If I try to open the file in Notepad, I get a Windows ! message that says Access is Denied. I am trying to open the file directly from the LabVIEW startup screen, I am fairly sure that the process I am using to open the file is correct. (I have also tried just double-clicking the file in Windows). I want to look at the code structure that he used and possibly modify parts of the program. From my point of view, it appears as though the author may have protected his program files somehow. Is there a way to check for this, or some other way to view the files? Many of the files that I want to look at are simply subVIs that are part of the more complex DAQ system he made.
how to pass stop button's boolean value to subvi's subvi
There is a stop button on my main vi and the boolean value could be passed to subvi using control reference. So the subvi could stop when the stop button on main vi's front panel is pressed. My question is how I can pass that boolean value to nested subvi, so once the stop button in main vi is pressed, all nested subvi stop? Thanks.
Re: how to save my 3 channel data like this
I have a problem. When I tried to combine my vi with yours there was a error. It says 'Array to spreadsheet String:contains unwired or bad terminal,you have connected two terminals of different types' I am not well experienced with Labview. Thus , I need your help at this point.You can find the picture vi below. Best regards
Re: Converting html documents to plain text using LabVIEW
brHi Jim, Very efficient VI. Is there an OpenG version of this? Regards, iKhalid/i ps: I'm sorry if this spams notification mail to all others on this thread. p
Re: Wanted: #define
At 16:23 -0400 06/15/2004, George Gatling (Contractor) wrote: From my days as a C programmer (shudder) I have to say I do miss the #define. I realize LabVIEW cannot really have an exactly analogous feature because the scope of .vi is too different from the scope of .c, but there must be some way to get the same functionality. I figure a global might be the ticket here, but I thought I would ping you guys and see if anyone had something more clever or if there were any gotchas to using a global. I would type my #define values into the global, make current values default, and then read from the global. This particular global would never get written to programmatically. You need to disconnect the global from the running hierarchy to make current values default. You might consider intelligent LV 2 style globals where the first time they are called, they load from a config file. When a global is written to, the corresponding element of the config file is updated. You can use the built in config file management or the tool kit recently offered for sale. :-) The LV style global can check for first run and load the initial values. It can keep an array of keys and return variants for that key. Then for each global make a VI that passes the correct character string key and casts the variant into the correct representation to return to the user. Then each of these VIs can be used just like a read global. A bit more complicated, but very robust and makes it easier to update single values rather than making all values default after stopping and starting the VI. Then forcing the changed VI (defaults changed) to be saved. That being said, I have also made a global to hold constants that I hope never vary. It will work. -Scott
Re: Wanted: #define
I thought about using an file to store the values in and doing elaborate sorts of things to make it easier to update the values, but in truth that is all overkill for what I am trying to do. These are not values that the user would ever want to mess with... things that are currently just constants scattered around the application, like the string for the title bar or the number of times to try doing some low level operation before giving up. Stuff that will probably never change, but is easily forgotten about and lost in the pile of vis. Back in the days of C it was extremely rare to find a constant in my code... all that stuff just got #defined and moved to the tops of the files... and that is sort of what I am hoping for here... something that is not complicated and just collects constants into one place and names them. Im probably to lazy to do anything about it in the app I am working on right now... just something I am thinking about for the next time around. George Gatling Applied Technology Division, SFA Inc. Space Physics Simulation Chamber US Naval Research Laboratory 202-404-5405 (phone) 202-767-3553 (fax) If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason. --Jack Handy
How to get rid of LabVIEW icon from EXE shortcut I created on the desktop?
After I create shortcut for my LabVIEW application=92s EXE on desktop, LabVIEW icon shows up. This default LabVIEW icon also shows up in Windows explorer window. ( This is not the one which I create in Labview icon editor. Icon created in Icon editor only shows up on toolbar) How to get rid of this icon on desktop (but not the shortcut), and have my own icon wherever customer istalls my EXE?
Re: Is there any way to have more than 28 connection terminals?
Hey Gonzo, My first thought is that you really might want to reconsider this VI that you are developing. Is there another way that you could design it such that it does not require more than 28 inputs/outputs? Some other information that could be useful: what do you plan on calling this dll from? just how many inputs and how many outputs are you looking at? There is an example in the NI Developer which talks about using a structure in a dll to correspond with a cluster in LabVIEW. a href=http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3DD8F56A4E034080020E74861p_node=DZ52048;Using Structures in a DLL with Clusters in LabVIEW/a If it's possible, try and take a look through the example and see if this option could work for you.
Re: how to pass stop button's boolean value to subvi's subvi
Thanks.
Re: tek210 programming
Charles, I didn't dig through your code much, but what is your iberr constant after you do the IBRSP() and you get the error? That could give us a clue as to why it is failing. What version of the driver are you using in both cases (Win98 and 2K)? Scott B. Applications Engineer National Instruments
how to save changes to downloaded instrument driver
I am using downloaded Tk278x drivers. The default address is different from my what I want. I tried to change the address in the VIs. But I am not lucky. How can I do it? Many thanks.
Re: How to get rid of LabVIEW icon from EXE shortcut I created on the desktop?
I am assuming you're using LV5.0 or above. In the application builder, you have an option to load in custom icons (32X32 and 16X16). Make sure you include these icons in your build process as a support file. To create the icons I suggest using an application called MicroAngello. Hope this helps. Robert
Re: system low on virtual memory
You are running out of virtual memory, because your physical AND virtual memory are exhausted. If virtual memory is low, free physical memory will be virtually zero. There are a few things you should do: (1) Do a detailed analysis of your code to make sure you don't create extra data copies in memory. In LabVIEW 7.1, you can anayze the buffer allocations directly. (2) Whenever virtual memory gets low, your OS will need to increase the swap file, taking a wild guess on how much is needed. This will repeat over and over if your data structures continue to grow. It would be better to set a large minimum size in the virtual memory configuration. This way the swap file is already at the final size, minimizing sizing operations. (2) If your final data has a know size, it is much more efficient to initialize and array with the full size (e.g. all NaN), then use replace array subset to insert the data as it is acquired, keeping track if the insertion point.
