Re: How to close TCP port in LV 4.1?
OK, How about an image of how these sub-VI are being called. The extensive use of Globals makes me nervous but I can not spot anything solid that would cause me to suspect a race condition. Images of these VI's being called will shut me up. Ben
Create histogram express vi
Hello, I'm trying to use the express vi create histogram, but I want to be able to control the values of the maximum and minimum and perhaps the number of bins at run time. Is this possible or is it only changeable in edit mode? Thank you very much for the help!
How do I get an ActiveX Reference to sheet that is already open.
I need to get a reference to an Excel sheet to write some data to. The problem is the workbook is not opened by ActiveX and I can't seem to find the right combination of Methods and Properties to get the reference. This is on WinXP, Office XP and LabVIEW 6.1. Thanks Ed
Re: while loop causing problems with sent commands?
I cannot see anything wrong with the telnet side of your code, but I am no telnet expert. On the LV side of your code, you may want to move the boolean terminals inside of the event that pertains to them. This way your buttons will pop up after the event is fired.
Re: How to close certain subvi front panel?
i think my prob. with this is that i dont want my subVI to close unless i specify them. i will post my program tomorrow thanks. I actually need a button in my mainVI to reset mainVI front panel settings and close subVIs (that is opened). And this button is suppose to be able to work anytime. Thus the prob. arise when my subVI is not opened and "close FP method" cannot work. Any better ideas to make such buttons could be helpful.
Re: How to close TCP port in LV 4.1?
A note on the "close listener" diagram: The "abort" input terminal was documented as being ignored, though I still tried giving it a "true" when the default "false" didn't seem to work.
Re: How to close certain subvi front panel?
Thanks. I will try this method. But it means that i have to read every one of my subVIs?(Pls correct me if im wrong.) And if thats the case its alot of them. Is there any way to get hold of any reference to the front panel that is opened?
"Hi,I'm having problems controlling the Agilent E4422B...
"Hi,I'm having problems controlling the Agilent E4422B Signal Generator with Labview. When using the Labview driver functions such as initialize instrument I always get an Error -1074135040. I can query the device through the measurement and automation tool. I can also Identify the instrument by issuing a *IDN? with VISA write and read. Why do I get this error while using the drivers supplied by NI for this equipment? Any Ideas?
Re: Why DB Tools Execute Query can't work correctly?
Hello cnxht, Thank you for your question regarding the DB Connectivity Toolset. You mentioned that you were trying to use the DB Tools Execute Query.vi but you can=92t select certain data in a MS access database using the SQL that you mentioned. You may want to use single quotes around the =912004-3-12=92 string. The following is an example from the sqlcourse website that might help. This will only select rows where the first name equals 'Eric' exactly. select * from empinfo where first =3D 'Eric'; For more information on SQL, take a look at the following website: http://www.sqlcourse.com/
Re: Displaying a custom graph
Joe, Your re-wiring suggestion worked. The graph now functions as I had hoped it would. Also, up to this point I havent had any problems with freezing. I have my fingers crossed that the wait function also worked. Thanks for all your help. Due to your knowledge of my program, is it ok to add a comment in this thread in the future if I have a problem? thanks again, Matt
Re: How do you open a specified Labview Vi from a different Labview Vi?
It sounds like you can do this like Dennis said. Maybe try using a state machine architecture. hope this helps.
Re: How to close certain subvi front panel?
One of the things that you might try is that the property node for front panels includes the Front Panel Open property that you can READ to see if the panel is open before you try to close it. It's a boolean so easy to build a case structure after it. Hope this helps. Rob
Re: How to modify WaveformChart history data length programmatically
One more thing jbao, THe best way to thank someone on this exchange is to give the best answer a four star rating. This way others in the future can quickly find the answer to their questions. Have fun, Ben
Re: serial VISA not sending output until closed
Just for the record - since this question came up for me recently - the official answer is that VISA 3.0.1 does support LabVIEW 5.1. In fact it should support any older version of LabVIEW, but that may not be tested/officially supported. See http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000800E9C6&USEARCHCONTEXT_CATEGORY_0=_201_%24_13_&USEARCHCONTEXT_CATEGORY_S=0&UCATEGORY_0=_201_%24_13_&UCATEGORY_S=0";>here...
Re: How do you open a specified Labview Vi from a different Labview Vi?
When an Emergency Stop 'button' is pressed I wish to jump into a different Vi which will allow me to restart a sequence of events. When this Vi is complete, i want to return to the original Vi, containing the emergency stop function. I will try the SubVI method (I'm not a very experienced user though...).
Re: Generating a pulse train
Hi Sami, The PCI-1200 Legacy DAQ Board is not supported by new versions of NI-DAQ. If you have a newer version, I would go uninstall DAQ and reinstall DAQ version 6.9.3, which can be found http://www.ni.com/support/daq/versions.htm";>here. Also, remember that you will not be able to use new DAQ features (e.g. DAQ Assistant, DAQmx, etc). I found an example program http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3DD3556A4E034080020E74861&p_node=DZ52328&p_source=External";>here that may help you. I'm not sure if you've tried this one. Hope this helps! Jeremy L. National Instruments
keithley 2400 labview driver is incredibly slow
Hi, I am using a Keithley 2400 multimeter in combination with Keithley Original driver/labview 7/windows 2000. When somebody else uses the programmes i wrote, the time for 1 measurement increases by a factor 3 compared to the access speed on my account. Since there a lot of measurements in my project this means that the whole experiment will take 6 hours instead of 2 when somebody else uses my programme. Has somebody any idea how to solve this problem? Thank you in advance, Joerg
Re: How do you open a specified Labview Vi from a different Labview Vi?
Or just call a subVI statically. This is the simplest and most common method. Just exactly what are you trying to do?
Memory allocation problem with CWGraph3D
Hi, I need to refresh CWGraph3D continuously with about 1 points. For some reason the graph allocates memory all the time and in the long run (after 24 hours) CPU's memory will become full and the application will be slow down. I have tried to clear the graph with ClearData -function with no success. ClearData seems to clear just the graph, not the memory. I also tried to use Request Deallocation -function, but it didn't help either. The memory won't be relased until LabView is closed.
Re: Fatal Internal Error drawmgr.cpp 2961
Hello suresh.r, Thank you for your question regarding a LabVIEW internal error. You mentioned that the error only occurred after using a help icon but removing is has not helped. There are a couple of scenarios that could be causing the error that you are seeing. Most likely one or more objects on the front panel are causing the video card to return this error. One possible solution may be to try disabling acceleration of your video card or installing newer video card drivers however you may want to read the following documents on trouble shooting this error. http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/01b186b5ceb1d07786256747000f4319?OpenDocument http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/16cf1334d094a4f6c1256be30074b9fe?OpenDocument Other resources can be found on the ni.com website by clicking the support tab at the top of the home page. Then search from Technical Resources at the top of the page for your topic. I hope these resources help! Let me know if you need any other support with this issue. Shea C. Applications Engineering
Re: How can I insert a C++ programm in labview 5.1;
Ah, I think I understand. Your ECU is sending a stream of six bytes... FF,data1,data2,data3,data4,data5 And I guess it just does this continuously. So, you probably want to continuously read the data and update a data structure that shows all of your engineering data (such as what state the throttle and other things are in). There are a variety of ways you could handle the reading of data. E.g., you could just read all available data and search for 0xff, or you could read one byte at a time until you find 0xff. You could also just set your termination character to 0xff. Anyway, once you get your data into LabVIEW as a string, you can use the String to Byte Array function to create an array of int8's. (You could then search in there for a -1 value for your synchronization byte.) Once you have an array of int8's, you can index it and use Number to Boolean Array to convert each int8 into an array of Booleans. This will get you the individual bits that come from the ECU. Hopefully this makes sense and gets you far enough along. Brian
Re: Why does one while loop stop after 3-4 weeks?
Wow! The only other thing I can think of is way out there. If there was sufficient noise on the serial line, it could look like a continual stream of data that will prevent your timeout logic from running. This would show up in your accumulator string indicator. So, the only thing I suggest at this time is to check the length of the string in the accumulator when it is in the hang condition. This would also mean that you could "un-hang" the loop by pulling the cable while hung. Trying hard to help, Ben
Re: the old problem"visa error -1073807195"
Here's what you'd need to provide to tell me for sure: - The hardware configuration, for example, the GPIB controller board number - The instrument address - The resource string you are using - Whether the instrument appears in our tools like MAX or VISAIC But I've got a couple of ideas based on the error code. It's suggesting that you're trying to use something like "GPIB2::..." when in fact your GPIB controller is configured as board number 0. It could also mean that it can't find the GPIB library installed on your system. NI-VISA doesn't handle GPIB communications intrinsically, it needs NI-488. Hope this helps, Dan Mondrik National Instruments
Re: run a executable created in Matlab
BJD1613 <[EMAIL PROTECTED]> wrote in news:5065000500246A0100-107939520 @exchange.ni.com: > I do know that you can create a dll in matlab that > will allow inputs and outputs. You need the Matlab compiler to do this, and its not a free option. As far as I know, the Matlab compiler is the only way to generate an executable from matlab.
Re: How to modify WaveformChart history data length programmatically
No wonder I never noticed the upper limit! Ben
Re: Can I use LabView Run-Time Engine on Windows XP?
To eleminate the possibility of errors, you need to convert the application to a version fully compatible with windows XP, like 6.1 or 7.0 (6.02 should do it) Would version 5.1 work with XP, NI do not gaurantee that. However, I had installed apllications written in version 5.1.1 and worked fine under XP. In your case, just give a try, if it did not work as expected, you may have functuionality that may not be fully comptaible with XP.
Re: I am trying to output a sine wave that increases its frequency every cycle.
Did you save your excel/txt file in .lvm format. (LabVIEW Measurement File). If not I would try that. If it isn't what you can do is read in your excel file and get all the data points and then place them into the write labVIEW measurment file express vi. This will help you convert to the format required. Hope this helps.
Re: run a executable created in Matlab
You can run an executable from labview using the system exec function under the communication palette. This acts like the command prompt in windows. You will execute your exe just like in the command prompt. As far as inputs and outputs you can't do this with and executable that I know of. I do know that you can create a dll in matlab that will allow inputs and outputs. Once again in LV you can call this dll and place inputs and have outputs using the call library function. Also in LV there is a new simulation toolkit that will allow you to run simulink models from Matlab. Pretty useful actually. Hope this helps.
Re: How to programatically control a stand-alone LabVIEW application
> How can I programatically control a stand-alone LabVIEW > application(exe) from another VI. I tried wiring "localhost" to the > machine name(in open application reference node) and specifying the > path of the exe to the (open VI refernce). I can't, it throws error. The main thing you need to do is configure the Built app so that it has the VI Server on and is listening on a known and distinct port. Depending on what menus are available in your EXE, you might be able to use the tools>>options dialog to set these things, otherwise, you can copy from your LabVIEW.ini and modify slightly. Ultimately, you want an EXENAME.ini file, with EXENAME being substituted for your EXE's name. If your ini has a section header in []'s, change that to the EXE also. Then place the VI Server tokens to turn the TCP connection on, to set a port, to allow or disallow different types of access, and to allow/disallow different machine IP/DNS patterns. Again, this stuff is more easily copied from the LV ini file and modify the port number. Now when you try to open the connection, use the localhost and use the new port number. Greg McKaskle
Re: Problem with "Run Vi" Invoke Node
Good cal Wiebe! I was drawing a blank on this one. dropThroughClicks Ben
Re: LabView 7 Express and Imaq Vision Builder 6.1
> Thanks for advice. I do apologize for the long delay before replying, but I've not > been in the office. > > The frame grabber I have installed has no LabView wrappers to my knowledge. > Apparently, I need a NI grabber board for Vision Builder. With that in mind, I'll > now concentrate solely on learning/using Labview 7 to create the applications > required by my company to work with the non NI card I have installed. > I'm coming in late on this one, but here is what I know. Vision Builder will work with boards it is knowledgable of and file images. If you are using Vision Builder to determine the correct processing of an image, you can do this based upon file snapshots. Later when Vision builder generates LV code, you can modify it to call into the 3rd party DLL to capture images. They will likely return a 1D or 2D array of numbers that you can then create an image from and feed into the rest of the generated code. This should allow any image capture to be used. You might also want to ask the maker of the board if they provide VI wrappers to avoid the headaches of figuring out the DLL interface. Greg McKaskle
Re: How to programatically control a stand-alone LabVIEW application
Try using the system exec function under the communications palette. This can be used just like opening a dos window and running the exe from the command prompt. Hope this helps.
Re: How do you open a specified Labview Vi from a different Labview Vi?
You can do this using vi server. These functions are located under the "application control" palette. The first thing that you will need to do is open a vi reference. You can use the path of the vi you want to open to obtain this reference. Then you can use a combination or just one property node and invoke node from the same palette. There are also examples of this located in LV find examples. Type in server and you will find example vi's using vi server architechtures. Hope this helps.
Re: How to programatically control a stand-alone LabVIEW application
Using a data socket connection between the two VIs should do the trick. There are some examples provided with LabView
Re: Problem with "Run Vi" Invoke Node
humm..not sure if I understand your order of events. First the main vi is open and has the focus, then I click the button on it, then the sub vi is lauched. It should lauch on top and have the focus. Instead, on the instances when it it does not work, when I hit the button, the main VI flashes real quick (loses focus and then gets it right back) as if the sub vi had been lauched, finished executing and closed all in a split second. I check to see if maybe the subvi was just hiding behind the main VI but no such luck. Interestingly, all of this does not occur when I have the RUN VI node set to wait till done. However, I prefer not to have it this way as the two VIs are suppose to react with each other and the user is suppose to be able to use both.
Re: Remote use of subpanel feature
If you build a vi with the subpanel and connect using remote front panels from your remote computer sure. Hope this helps.
Re: not able to type into string control
Make sure that there is no front panel decoration in front of you string controls.
Re: I read data from RS232 port in bits format 0 &1.How i can convert these inputs to useful data?
Tbob, thanks for your help.. I ll try and i think to succeed!
Re: not able to type into string control
Post a sample VI with the controls that you cut and paste from your app. The other though that comes to mind is that they may be locked. Just guessing, Ben
Re: Equipment simulation in NI Explorer for Labview & CVI
If your instrument has an http://www.ni.com/devzone/idnet/types.htm#ivi";>IVI Driver, then there's simulation built in. If it's not, running the driver will create errors. You will have to modify the driver to eliminate the errors or rewrite the program to ignore them.
can i run labview on Windows CE or embedded XP?
If it is possible, what are the minimum specifications for the PC? And can anyone recommend a manufacturer?
the old problem"visa error -1073807195"
when I try to use the "visa write" to connect to ADVANTEST R3667CG , the error -1073807195 occurred,wheter i trun on the power of the instrument or not. When I try to connect to another instrument TDS 5104,the error"error when establishing software connection,the interface is valid but the specified interfere number is not configured".how to slove the problem ?Thank you!
How do you open a specified Labview Vi from a different Labview Vi?
I need to open a different Labview Vi when a certain function is performed from within my current Labview Vi.
How to programatically control a stand-alone LabVIEW application
How can I programatically control a stand-alone LabVIEW application(exe) from another VI. I tried wiring "localhost" to the machine name(in open application reference node) and specifying the path of the exe to the (open VI refernce). I can't, it throws error. Help would be really appreciated. Thanks.
Re: How to close certain subvi front panel?
can you attached your program? As i am not sure what you mean of "The mainVI button is suppose to reset and close the subVI FP". Normally i us ed set the subVI to be open when called and close subVI after finished runing. you can do it by pointing the subvi in your mainVI and right click selected the subVI node setup. hope it help you solve the problem
Re: Why do I keep getting DAQ Error 10444 (No Memory), even after upgrade to NI-DAQ 7.1
Hi Saj, It's Peter from National Instruments technical support department here. As you know we've been looking at this problem in the department and hopefully we have now found the reason behind it and you should be able to stop the task id being overwritten. This in turn should then hopefully stop the memory error. Best regards, Pete.
Re: the position of middle color box markers!
Hi Lorry, Have these answers cleared up your problem. If so, then great. If not, then I have subscribed to this thread and will be notified if you post to it again. Speak to you soon, Peter H Applications Engineer National Instruments
How can I modify the High Speed Data Reader VI to show the time information in x-axis?
I am just a beginner learning the LabVIEW programming currently. I have a PXI 6115 DAQ card and have to make a hardware timed acquisition VI for maximum performance. Thus I use the High Speed Data Logger VI for data acquisition. However, when I read my data by using the High Speed Data Reader VI, it doesn't show its time information in the graph. How can I modify the High Speed Data Reader VI to show the time information in x-axis? I hope you can explain easily because I am a beginner.
