Invoking the Tools->Compare VI's functionality from my LV program
Hi, my application requires that I invoke the 'Compare VI's' functionality of LabView from my LabView 7 program. Can someone tell me if and how this is possible.
Re: electret microphone array ----> cheap daq card ?
Last time I did that I had to allow 0.7mS settling time after each mux changeover. (1.4KHz effective sample rate) Luckily I was only reading an array of tone/volume potentiometers. Jim A.
Webserver with Direcway
I am having problems with being able to remotely connect to my webserver (snapshot)which is launched on Direcway 2-way system. Sometimes it hooks up fine, and other times it can't find the webserver. Is there anything specific to Direcway and Labview 7.0 webserver, as far as settings that cause this. Thx for any help.
Problem with simultaneous DIO with PCI-6024E
Hello All, I am having a problem with performing simultanous DIO tasks with my 6024 card. I need to write to a DIO line a high signal, whilst at the same time, reading from 2 DIO lines. When I perform these two tasks on the same VI, the write DIO will change from the required high state to a low state. (I need this to stay high as it enables a drive). Im using high level VI's (Read and Write to digital line VI's) since im a relatively new user and I think this might be the problem, as the port is being reconfigured each time I do an loop iteration. Any suggestions on what I can do to overcome this, or any examples on how to use high level vi's? thanks all in advance, David
display last 10 results
I would like to display the last 10 results as a fifo array. any ideas how to do this??
fuel cell test
Hi I am a LabVIEW programmer who would get an interview with a company making fuel cell. So I would like to get some idea about what kind of test do they ususally do on fuel cell and what NI's hardware or instrument they usually use to test fuel cell (eg. DAQ?). I just want to get some idea about what topic in LabVIEW, hardware, and instrument I should specailly focus on.
Re: I read data from RS232 port in bits format 0 &1.How i can convert these inputs to useful data?
You should be able to realize the protocol using the serial, string, and integer functions of LabVIEW. "tasos" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > I am using Labview 5.1 to communicate through the RS232 port with the > CPU of an aircraft engine.I take data in bytes which i want to convert > in useful data.I have informatio about the serial protocol.I think > that i have to write a program in C++. How can i solve my problem?
I read data from RS232 port in bits format 0 &1.How i can convert these inputs to useful data?
I am using Labview 5.1 to communicate through the RS232 port with the CPU of an aircraft engine.I take data in bytes which i want to convert in useful data.I have informatio about the serial protocol.I think that i have to write a program in C++. How can i solve my problem?
How can I insert a C++ programm in labview 5.1;
I am using Labview 5.1 to read data from sensors (analog input), but I would like to read data from a serial RS232 port. How I can do this;If I write a C++ program, how can I insert this in labview;
Re: Who can I build music equalizer in LabView?
The sample is based on a NI example and as such has been extremely well tested. The sample code requires audio input from the sound card. The mixer on your sound card should allow you to effectively feed the audio output back as an input. This tested fine with my audio card. It's a very old Soundblaster. Other wise you will need to connect a signal from the earphone socket to the audio input socket. I should say I have never tried this and don't know if the signals on your card would be suitable for connection in this fashion but the principle is correct. Test just you Microphone and speak into the system first. The band selection can be improved for the output but if I remember correctly you have lots more bands in your design. For me it would be an engineering approach rather than an asthetic decision. Anyway to the dulcet tones of Howard Jones 'Like to get to know you well' it looks fantastic!
Select printer when printing panel
I am trying to find a way to print a front panel (graph with data) and be able to select the printer that it is going to. I have find in the library "print panel to printer.vi" which is great, BUT I can not find a way to send the data for the graph into that vi. How do I pass data for the vi to be printer to this function?
Re: Question about communication between labview programs on separate
I ma not sure if you have to use TCP/IP. What if Bob had a seperate loop that just used UDP to repeatedly broadcast a count that is incremented each time a read completes. Alice could listen for the broadcast and and act depending on if it saw Bob count change in a resonable amount of time. The next variation I would concider is using to use VI server (based on TCP/IP but the low level stuff is done for you). Bob could invoke a VI on Alice that told her to start. If she does not hear from Bob to stop she just keep blasting away. Otherwise the approach you have outlined MAY work. I can not say the will not be complications becuase I ussaully write my code to avoid errors so I can not speak from experience. I seem to remember people having some trouble with restarting/reopening TCP sessions over extended periods of time. That may have been some time ago, not sure on that. I hope this help. Fire away if you have follow-ups. Ben http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=261&HRedirected=True&HUserId=101_3529&RFORMNUMBER=6";>Ben Rayner http://volt.ni.com/niwc/common.jsp?page=products_certification_cld&node=10638";> Certified LabVIEW Developer www.DSAutomation.com
Re: How to close TCP port in LV 4.1?
Could you post an IMAGE (LV 4.1 is getting scarce these days) of your code so we can take a look? It sounds as if the listen is being invoked again. There have been some changes and fixes implemented since LV 4.1 so I can not say that I have seen this issue previously. Trying to offer what little help I can, Ben http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=261&HRedirected=True&HUserId=101_3529&RFORMNUMBER=6";>Ben Rayner http://volt.ni.com/niwc/common.jsp?page=products_certification_cld&node=10638";> Certified LabVIEW Developer www.DSAutomation.com
Re: Need help on labview
Nirmal discussed the hardware interface in his reply to your other posting. Look at the example that can be found under Help>>>Find Examples>>>Hardware Input and Output>>>DAQ>>>Analog Input>>>General>>>Cont Acq&Graph (buffered).vi That should get you started. Ben http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=261&HRedirected=True&HUserId=101_3529&RFORMNUMBER=6";>Ben Rayner http://volt.ni.com/niwc/common.jsp?page=products_certification_cld&node=10638";> Certified LabVIEW Developer www.DSAutomation.com
Re: Who can I build music equalizer in LabView?
Hi, It's still not going by the music..
Re: memory eaten up - guilty: Datasocket or References?
DR VI discussed that here http://www.ni.com/devzone/lvzone/dr_vi_archived4.htm The one additional note I should stress is that once system resourse are allocated for references, they do not get free'd up until LV exits. Ben
Re: copy graph to word using EMF(WMF) format
> Hi I am using Labview 7.0 and I want to copy a graph to buffer so I > can paste it to word/powerpoint in a vector graph format. Is there an > easy way to achieve this? Actually, LV does do this, and it can do it at runtime. To copy any control at runtime, right click and choose Copy Data. On the internal clipboard, LV places the object and raw binary data ready to be pasted on an empty panel or into an existing compatible object, like another graph. On the external clipboard, it places an image of the control. The image will be bitmap if the object uses complex drawing operations, in otherwords if it uses the 3D style, and probably the dialog style of controls. If the object is the classic control, it will create an EMF. LV gave up on WMF years ago since it is so limiting and incomplete. If you are copying from a 3D, paste onto a new panel, replace with classic -- it should preserve the data -- then copy data again and paste into Excel, word, etc. By the way, once you have it in one of those packages, when you select Edit graphic I think it is, they convert it from EMF to their own internal format. This typically goes OK, but sometimes the appearance will change. I think that is an MS issue. Once in the other format, you can restyle the lines, delete elements, change fonts, change colors, etc. Greg McKaskle
Re: Freezing Tab Control/State Machine
> "National Instruments recommends that you place only one Event > structure in a loop. When an event occurs in this configuration, the > Event structure handles the event, the loop reiterates, and the Event > structure waits for the next event to occur. If you place two Event > structures in a single loop, the loop cannot reiterate until both > Event structures handle an event. If you have enabled front panel > locking for the Event structures, the user interface of the VI can > become unresponsive depending on how the user interacts with the front > panel." > > There are other details in the help listing including a deadlock > condition caused by a double-click. These caveats should be updated to more specifically warn against this for statically registered event structures. An event structure working with dynamically registered events can reside anywhere you want, even beside another one. You can even place them inside one another, but you had better know what you are doing there. The problem with statically registered events is that any and all event structures on the diagram are always registered, even before they run the first time and after they run the last time. This feature means that you don't miss events. The problem is that when the panel locks waiting for an event to be processed, and your diagram isn't going to process the event, what happens then. Fortunately, the Abort button should always work, even on locked panels. Greg McKaskle
