Re: Comment labview gere la memoire dan
Hallo as, Can you please tell me what exactly the error message is when it stop the application. Which LabVIEW Version do you use and if the application is not so big, you can attach it on your answer. Please take a look if you really close these files which you don=B4t need anymore.Thanks in advance. PatrickB National Instruments
Re: Continous acquisition on 800MHz, W_XP, with 6025E - has a problem on 200kS/s
Hello Big-C. I know I can sample (200kS/s/No.of Channels) per channel. I do not have a problem here. What I mean is I have a software triggering since 6025E does not support hardware analog trigger. That means that I am running a detection procedure each time I get a new block of data from memory. I looks like this procedure is taking up most of the processor time, and this is a limmiting factor. I tried to acquire data without this trigger procedure, and get possitive result. I can read every 3k Samples, which come to the memory buffer. It looks like I need to work on my treshold detection procedure. I have already found some creazy stuff going on, but that is a subject for a new thread. Thank you for your comment. kind regards Pawel
Re: Redrawing XY and transparent Graphs (long)
wayne galbraith wrote: This is something that we have all had to put up with for many years and I don't see NI solving it in the future. Surely the most popular plotting technique is with an XY graph as we all don't simply plot against time. I am guessing there is a fundamental problem with only adding one extra point at a time - although maybe Greg Mc will let us in on the secret. Since the Measurement Studio ActiveX graph control has YDataAppend and XYDataAppend on a per-plot and per-graph basis, there doesn't seem a fundamental reason. And since it looks very like the LV graph, you can use it as a drop-in replacement on the panel, though of course it's not as easy in the code. -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/
Re: Feedback
Hi, thanks for your help. I'm sure the subVI's you send me are the solutions to my problem. The problem is, i cannot open it, because i'm working with LabView 6.0 (you send me subVi's in version 7.0). Could you please send those subVI's in 6.0 please? It is for me very dificult to get version 7.0at the moment. Best regards, Julian
Re: Redrawing XY and transparent Graphs (long)
Craig The only problem that I could see here is changing your X axis during displaying of data. Does the Active X control keep any kind of buffer?? I'm guessing that, that is what most people are after and as such would require a buffer of some description to be kept. It is a bit of a pity NI couldn't have written this as I'm sure their s.ware engineers could write it much more efficiently than the rest of us. Basically - shove the data in one end with a buffer size limit and then allow you to plot any point against any other appending data only as you go. Then if the X-axis on the plot has altered then redraw the whole plot. This I'm guessing is what most of us have implemented on our own - just not as efficiently as NI may have written it. wayne At 08:47 AM 12/05/2004 +0100, you wrote: wayne galbraith wrote: This is something that we have all had to put up with for many years and I don't see NI solving it in the future. Surely the most popular plotting technique is with an XY graph as we all don't simply plot against time. I am guessing there is a fundamental problem with only adding one extra point at a time - although maybe Greg Mc will let us in on the secret. Since the Measurement Studio ActiveX graph control has YDataAppend and XYDataAppend on a per-plot and per-graph basis, there doesn't seem a fundamental reason. And since it looks very like the LV graph, you can use it as a drop-in replacement on the panel, though of course it's not as easy in the code. -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/ -- Wayne Galbraith School of Civil and Resource Engineering The University of Western Australia 35 Stirling Highway Crawley 6009 Tel - (08) 6488 3788 email - [EMAIL PROTECTED] www.civil.uwa.edu.au/nata --
Re: Redrawing XY and transparent Graphs (long)
wayne galbraith wrote: Craig The only problem that I could see here is changing your X axis during displaying of data. Does the Active X control keep any kind of buffer?? Yes, it definitely buffers because one of my (VB) apps pans, zooms and scrolls without reloading the data. The X axis can be set manually. Obviously changing the X axis causes a redraw. -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.co.uk/
The Ordinal 2011 could not be located in the dynamic link library nidaq32.dll
After installed BridgeVIEW 2.1, labview 6.1 DataAcquisition function showing the Ordinal 2011 could not be located in the dynamic link library nidaq32.dll
Re: Update LabView 6.1 to 7.0; error 1003
Hi, thank you for your E-Mail. I have found the problem. In a SubVi I have a reference as an Input. The Output of this SubVi was the Indicator, where the reference is related to. After I have replaced the Indicator with a Local Variable to this Indicator, I could build the executable. But this problem occurs only with LabView 7.0. It don't occur in the development environment. Thanks Georg Lampe
Re: pb de licence labview sui
Bonjour, j'ai r=E9solu mon pb en le court-circuitant. Le serveur de licence ne fonctionne plus car il ne d=E9marre pas, car le hostid de la machine a chang=E9. Pour =EAtre tr=E8s exacte, il d=E9marre et s'arr=EAte aussit=F4t = car il y incompatibilit=E9 avec le n=B0 de hostid. j'ai essay=E9 de recr=E9er un nouveau fichier de licence mais cela n'a toujours pas r=E9solu le probl=E8me (serveur de licence d=E9marrant et s'arr=EAtant aussit=F4t). J'ai r=E9solu le pb en utilisant un petit programme permettant de changer (par soft) le n=B0 du hostid. J'ex=E9cute donc ce programme au chargement, juste avant de lancer le serveur de licence. C'est une solution b=E2tarde. Si vous en avez une meilleure, je suis int=E9ress=E9.
Re: Peut-on lancer une acquisition dans un serveur TCPIP sans stopper la communicationTCPIP?
Merci. Votre r=E9ponse m'a permis d'avancer. J'enverrais un autre message si j'ai =E0 nouveau besoin d'aide
Re: Block diagram expansion criteria
I=92ve had this happen two times. Once turned out to be an intermittent Ctrl key. The other time I was using a Keyboard, Video Mouse switchbox to run two PC=92s with one keyboard, mouse and display. To switch between the two PCs, you could hit the Ctrl key three times quickly. Somehow that interfered with the normal use of the Ctrl key, and not just in LabVIEW. I disabled the Ctrl key switching and fixed that problem. This may not apply to your situation, but it might be something to check. Ed
Re: Multi-channel data acquisition via GPIB using a digital...
I think you misused the driver if you keep sending all settings. There are some high level examples included in the driver - Getting Started, Acq Wvfm Edge Triggered. These use many of the subVIs that you can also use when and if you want. The point of the high level examples is to give the programmer some idea on how to use the subVIs included in the driver. The other high level example is Acq Dual Wvfm Edge Triggered. At the end this does pretty much what your example does and gets two waveforms by calling Fetch Waveform twice. The differnce is that VISA is used (generally prefered over GPIB) and there are no sequence structures or local variables (not required).
Re: serial read information problem
Merci J' ai r=E9solue le probl=E9me et c'=E9tait bien un pb de config s=E9rie, bi= en vu! Merci encore pour la r=E9ponse salut
Re: Is it possible to set the current value as default while VI is running?
You can use the 'Make Current Values Default' invoke node, but as the name implies (note =93Values=94), it will set the current values to default for Ball/B controls on the front panel. There is no way to use this on just a single control. There are other problems when using this property. The VI that you want to use it on cannot be running. So you must stop the VI, and then from a different VI, get a reference to the other one and run the 'Make Current Values Default' node. You also cannot use it in a built executable because it requires the code to be recompiled which cannot be done on an executable. Your only real choice to operate on a single or just few controls is to use a config file, or if you=92re in the development system, right click on the control and set it to default that way. Ed
Re: Configuration wizard of a Vi express
Could you please tell me if the answer given below solved your problem? Bye.
Re: memory management and style
1) It seems to me that allowing people to pass pointers to complex data structures would allow for more efficient memory management. I know about refnums, but Shane and others seem to imply that refnums/property nodes come with unnecessary GUI overhead. I hate pointers as much as anyone else, but being able to pass by reference without overhead would be HUGE. Is there a way to do this? Actually, many of LV's datatypes are implemented with references, but the diagram behavior is as if they were done by value. You mention that you hate pointers, presumably this is in a serial language with a single thread doing one thing at a time. Putting pointers in a parallel language is ten times as bad. If instead of an array, you had a reference to the array and the wire splits, the split pieces of code will interact. The top branch will do a filter, then a power spectrum, then plot. The middle one will subtract off a baseline and get an rms value. The bottom one will simply plot. Since there is no longer any sequencing between them, they interleave and you get jibberish. To clean things up you either serialize them by putting them back into a wire, make explicit copies, or use mutexes and semaphores to control the order of execution. Ick. So LV and most other dataflow languages have by-value semantics, meaning that a wire represents the value, not a reference. On the otherhand, all arrays and strings, are implemented by reference. The LV compiler then determines how few copies are needed in order to maintain the same behavior as if all were copies. The performance and memory usage chapter gives examples of how this works. Is it possible to do pointers? Sure, some have done it. You call a block that copies or swaps the data into a private storage, and gives back a pointer/reference/U32. Later in their diagram, they call passing in the pointer and get back the array, or some portion of it. Of course LV knows nothing about these pointers, and you can't operate on things using LV icons until you go get the data. In many cases this uses just as much memory as the simple code without the pointers. 2) The avoid local variables when possible bit is news to me. But I get the point ;) 3) as far as I know, the GOOP projects use refnums, which are subject to the same overhead constraints as mentioned in (1). Current GOOP uses the pointer approach mentioned above, and all objects are referred to. The reads and writes are also serialized so that if you ask for the data on an object, you wait for someone else to finish working on the object, then you get the elements, modify and return them. Again, parallelism and pointers are something you have to manage pretty closely. 4) I think the problem with college courses is that most professors who design course curricula know about LabView, but they don't use it themselves -- their graduate students do. I've seen certain TA's make LabView instruction a pet project, but the novelty of G means that most students are happy to get to the point where they don't have broken wires everywhere (believe me, there's lots of swearing on LabView lab days). And most students are more worried about running their experiments than programming. This is the approach in the basket weaving class, the physics class, etc. It isn't unique to LV. And really, the point of the class is rarely to learn LabVIEW or another language, it is to learn some principles, and to do that you need to use some tools. Some students embrace the tools and realize they will need to know this later in life while others hack their way through just enough to get the desired A, B, or C. Enjoy, Greg McKaskle
Reading files
Hallo, this time I have two questions, I hope somebody can help: 1) I want to read a spreadsheat-file into an array, but WITHOUT the first two lines. How can I do that? I know how to read the data, but not how to ignore the first lines. 2) After the calculation I have two columns of data, x and y. I weant to save them in a spreadsheat-file like x y 1 2 3 4 etc., (seperated by tab; title not nescessary) I managed write single data into the file, but not the entire array. Arno PS: I am using LabVIEW 7, you can answer in german, english or dutch.
Re: Error -1073807246 when trying to control a circulator in Labview via RS-232
I wonder if the timeout on Write is because the handshaking isn't working. Suppose the device isn't handshaking the same way, or your cable is bad. In that case, Write may just give up. Brian
WHERE IS THE EVENT STRUCTURE IN THE FUNCTION PALLETE?
I am using LabVIEW Express 7.0 and I can not find the event structure inside functions pallete... I have used it so many times before and I know it exists but where exactly I can find it. It is not at the same place where the rest of the structures are (while, for, sequence etc). Thanks, P.C.
Re: WHERE IS THE EVENT STRUCTURE IN THE FUNCTION PALLETE?
If you use the express palette view, it will not be under execution control like some of the other structures. You need to go to all functions...Structures. There is also a second instance in application control...events. Of course if you bonly have the base package/b, you won't have the event structure (See http://www.ni.com/labview/how_to_buy.htm#compare ).
Re: MAX doesn't find the serial Interface on my laptop. VISA error code: -1073807360
I'm not sure why you can't uninstall 2.5. But the version of NI-VISA you want to upgrade to is 3.1. We've fixed a lot of serial bugs in each release, and gotten rid of a lot of incorrect VI_ERROR_SYSTEM_ERROR return values (some are fixed, others are changed to more logical error codes). Dan Mondrik National Instruments
Re: VISA serial communication in LV 7 application
I have made a new VI. All it has in it is VISA Configure Serial Port.vi The only input wired is VISA resource name, which is ASRL2::INSTR. The only output wired is error out. When I run the VI, I get a green checkmark in the error out status and 0 for the error out code. When I build this VI into an application and run it on the development system, I get a red X in the error out status and -1073807246 in the error out code. I have a feeling that either VISA serial communication is broken on my Windows 2000 development system or LV7. I really need to make this work, and I have no idea what to do.
Re: WHERE IS THE EVENT STRUCTURE IN THE FUNCTION PALLETE?
Well I double checked all the places and it is not there. As the matter of fact, I copy-pasted the event structure from some other vi that I have built before and when I went on help for the event structure and then tried to find it by clicking the button that finds it in the function pallete I received the message saying Object not found. Then it says it might not be supported in the execution target currently selected. Then it says to go to OperateSelect Execution Target but when I went to Operate I could not find Select Execution Target option. My guess is that somebody did not install labview properly and few functions are therefore missing... I am gonna have to further explore what is exactly going on ... thanks for fast reply, P.C.
Re: Block diagram expansion criteria
Thanks for pointing this out. I'm pretty sure however that it has something to do with the position of the box or line in relation to other LabVIEW code or something like that when you're trying to make the diagram expand outward.
Re: Labview 7 and USB control
I have a USB to serial and it work as a serial port which means that I can use the VISA drivers. Maybe it is the same for You. Look in windows device manager if it shows up there. TJ
Re: Open file problem
Thanks. You have been of great help
Re: How to draw the waveform for Tektronix TDS 500?
Like I said, the driver has an example. Look in the VI called TKTDS Read Waveform. It looks like there is a header being parsed out and then subset of the returned string is converted by type casting it to an array.
Re: VISA serial communication in LV 7 application
In regard to another application using the serial port, an application that uses the serial port and is often loaded on system startup is PDA synchronization software. This is such a common technical support call for us that we have specific warnings in our manuals to instruct users to make sure the PDA synch software is disabled. Allen Weekley Alpha Technics [EMAIL PROTECTED]
impression
J utilise Labview 7, j ai besoin d imprimer au format paysage comment faire en utilisant l outil de g=E9n=E9ration de rapport? merci beaucoup
how can I create a executable vi in Linux?
I have my vi, and I want to create the executable file. But I want to run this program (vi) in a embebeded PC that works over Linux!!so , I dont have screen and I dont want the panel up. How can I do this? Is it an option when I compile my vi and build my aplication? Thank you!!! Graci
Output a 1MHz squarewave through serial port
Is it possible to program using labview to output a 1MHz squareware out from serial port of PC?
Re: How can I automatically word wrap a string placed in a (multicolumn) listbox ?
Hi, To compute the sizes of text written using some font you can use Functions-Graphics Sound-Picture Functions-Get Text Rect.vi. In this function you can specify the font name, its size, and some options (italic, bold, etc.). Good luck. Oleg Chutko.
How can I automatically word wrap a string placed in a (multicolumn) listbox ?
Hello, Using LabView 7.0: I need to automatically wrap text inserted in a multicolumn listbox. The size of the listbox is fixed and I don't know the legth of the string that will be inserted. But the whole string must be visible, because it's Information is important I'm not allowed to use a fixed width font. :-( Has anyone any ideas (or a solution already?) How can I compute the length of a string in pixel to calculate to position to wrap? Thanks in advance, best regards, Rainer
On the topics of charts
I know that a number of NI programmers/employees are on this list and I was wondering if any attempt has been made to make the chart control more robust in LV 7.1. Chart options like the sweep update mode have been prone to leave ghost sweep bars, changing the x scale will sometimes cause the data to disappear, ghost or bad data points showing up whenever there is a change to the chart formatting, etc. And of course these problems always popup when you are trying to convince a customer that LV is robust and they will have no problems if they decide to go for an NI solution. So has there been any improvement and if not, why? -Norman J. Kirchner
Erreur DMA avec varte 6024E et sortie compteur
Lorsque que je mesure un signal ou que je le produit pas de probl=E8me mais lorsque je fais les deux en meme temps il apparait cette erreur: L'erreur - 200251 s'est produite =E0 DAQmx Start Task.vi Raison(s) possible(s): No DMA channels are available. Either shut down other task which may be using these channels or consider changing your data transfer mechanism to 'Interrupts'. Device: PCI-6024E:Dev1 Task Name:_unnamedTask68 C'est une erreur DMA donc de compatibilit=E9 apparement. Quelqu'un a t-il une id=E9e ( le pc est r=E9cent). Sinon j'utilise la sortie compteur comme g=E9n=E9rateur d'impulsion, est -il possible de faire varier l'amplitude car je ne veus pas de 5? merci
Re: how can I create a executable vi in Linux?
Hi Graci, Currently LabVIEW for Linux requires an X server. You can accomplish this by running a dummy X server on your embedded Linux PC. Or, you can install only the X libraries and then set the display to another networked X server. You might be aware that NI has several Real Time products that might suit your needs well. You can use PXI for the equivalent of a PC, or fieldpoint if you need a smaller/embedded solution, or RT plug-in boards which are basically PCs on a PCI card. All of these options would allow you to run LabVIEW executables headless. Your project sounds interesting, let us know more about it and it's requirements! David Duffey
Re: Looking for ready-to-use indicator that looks like a horizontal-platform panel in an airplane
You Win! There is another example near that one that shows how to draw a pie-chart. Parts of that example can be used to add your over-lay yur grid (i.e. do not fill). Ben
Re: Looking for ready-to-use indicator that looks like a horizontal-platform panel in an airplane
Thanks Chutla and Ben! I found an example NI Home NI Developer Zone Development Library Measurement and Automation Software LabVIEW Development System Building User Interfaces Displaying Data Pictures Rotating Graphics (Pixmaps) in LabVIEW Ben, do you mean this one?
Re: TCP/IP
i do this between several machines here in my department... on the TCP Listen.vi i only wire the port (i use 3) and a timeout (50ms) and leave the net address unwired. if you have more than 1 NIC you will probably have to wire something to it. then on the other pc with the TCP Open Connection i wire the address of the server machine (listener), the port (3) and the timeout (5000 in this case)... if you need an example i can wire something up for you good luck Dan
Re: Error -1073807246 when trying to control a circulator in Labview via RS-232
Determine wheter or not you have a straight through serial cable or a null modem cable. If it is null modem, your device will probably not properly receive the commands because it will be listening to the wrong wires in the cable.
PLOT THE OUTPUT VOLTAGE WITH RESPECT TO TIME
I have VI that is controlling the Standford Research power supply model PS350. I am using existing NI drivers for this instrument. I wanted to know what would be the easiest/fastest way of taking the multiple readings of the output voltage at the different point in time and then plotting the voltage versus time. Any directions and suggestions are appreciated. thanks, Pedja
Serial Port - Ballbar 2
I first want to thank Dennis Knutson for his answer to my previous question about the ballbar and serial communication. I'm now able to communicate with it using MAX. But when I try to use the Labview Basic_Serial_Write_and_Read VI, I instantly get an error saying Error -1073807246 occurred at Property Node (arg 1) in VISA Configure Serial Port (Instr).vi-Basic_Serial_Write_and_Read.vi. It also tells me that my resource is valid, but than VISA can't access it. I am wondering which argument is arg 1 and aslo what can be creating this error. Thanks a lot. Philippe
Re: IP Format.
You should not wire the net address. You only need to do so if you have more than one IP address. Use String to IP to convert a hostname or IP address to a network address, which is a simple U32 representation of the IP address, best displayed in HEX. (e.g. 255.255.255.255 = 0x).
Re: AOConfig buffer size
Hello Andrew, Setting your buffer size to be the same size as your array is typically what is done. The buffer size is not in bytes, but in samples. Please take a look at some of the example programs that ship with LabVIEW. Go to Help Find Examples Hardware Input and Output Trad. DAQ(LV 7.x only) Analog Output Generate Continuous Sinewave.vi. If you take a look at this VI, you will see that a sinewave array is produced using a FOR loop. This FOR loop generates an array that has the same number of samples as the buffer length input of AO Config. Take a look at this VI and see if you are able to modify it to fit your needs. In some cases, you may need to use a buffer that is larger than your actual data. This may be the case if your data array is generated dynamically and is not always consistent in size. The only size restriction in this case it that you are able to find a continuous section of memory that can accommodate the buffer. Let me know if you need additional assistance with this issue. The example programs should be a great reference. Regards, Bill B Applications Engineer National Instruments
Re: TCP/IP
Thanks Dan for the response. As for the example, I have TCP Listen side, I have Port assign to 3000 with 50ms time dealy with Indicator? Is this correct? Would it be easier if can send you the LabView file for Listen and Open and make the corrections from there? Thanks,
Re: IP Format.
The above answer was for TCP Listen. For TCP open, you just wire a string which can contain a hostname (e.g. www.ni.com or a dotted decimal IP address (e.g. 192.168.1.100).
Re: TCP/IP
you can send it if you want and i'll take a quick look... or look at the examples Dan
Re: TCP/IP
what kind of error do you get ??? it works here
Re: Error -1073807246 when trying to control a circulator in Labview via RS-232
thanks for the notes jcrooke but unfortunately I have version 6 of Labview so I can't open the file. Can you save it as an older version? :)
Has anyone installed LV 6.1 AND 6.02 in the same PC?
I have test systems deployed using LV 6.02 and one system uses 6.1. I don't want to upgrade all the systems but I need to support both locally using one PC if possible.
How do you delete a row from an array that has zeros in it?
I am reading a file that contains an array of information. Some of the rows might contain no information (zeros) and I want to programicaly delete those row(s) from the array and then restore that information to file. How is the best way to do this?
Re: TCP/IP
This is what I got... Error 63 occurred at TCP Open Connection in Open_To_Try_2.vi Possible reason(s): LabVIEW: Serial port receive buffer overflow. --- LabVIEW: The network connection was refused by the server.
Re: TCP/IP
5000 on Open side and 5000 on Listen side as well.
Can not set Remove Panel to No for dynamic VI
In the VI Settings tab of the Application Builder, has no row for my dynamic VI. How to add this row for my dynamic VI.
Odd behavior in Build Text Express VI in 7.1
I ran across an odd behavior with the BBuild Text Express VI/B that wasn't there in 7.0. When configuring the VI, if you select either Number or Boolean in the Variable Properties before typing anything the Text with Variables box, the first character you type will switch the Variable Properties back to Text. Subsequent variables entered will not change the Variable Properties back to Text. Ed
Re: Serial Port - Ballbar 2
Philippe: In this case it isn't really about arg1 at all. The resource you passed into the Configure VI (presumably something like COM1 or ASRL1::INSTR) is busy - the error is VI_ERROR_RSRC_BUSY. This means that you most likely have some other application using the resource, like Hyperterminal. For what it's worth, the property node refers to each property in order, so the first property inside the Configure VI is the timeout. This is the first point at which that VI needs to use the resource you passed in, so that's when it tries to open the VISA session and fails. So it failed when trying to do a 'set' on arg1 because in this case it couldn't open the resource. Dan Mondrik National Instruments
Re: Serial Port - Ballbar 2
Glad I could help. When you get the error, do you have any other program open that is accessing the serial port (i.e. hperterminal). Windows doesn't allow different programs access to the same port.
Re: Has anyone installed LV 6.1 AND 6.02 in the same PC?
Different version of LabVIEW can peacefully co-exist on a PC. The different versions will get installed in their own directories under the main National Instruments directory. You should also uninstall old DAQ drivers and install the latest available for your newest version of LabVIEW. That will contain drivers for earlier versions as well. I currently have LabVIEW 5.1, 6.0.2, 6.1, 7.0 and 7.1 installed. Toolsets can be a problem as some of them will only allow you to install in a single installation of LabVIEW, so you must manually copy the tools to other versions installed. Ed
Re: Help! If I have a binary file how do I then translate it to a spreadsheet file?
If it's not too big, can you attach one of the .bin files you created? I had a look at your modified data reader VI from a previous post and didn't see anything obvious in the code but it's pretty hard to debug anything without a file to input. When you run the reader, do you see data displayed on the graph? Does it match what you got when you used the logger?
Re: How do you delete a row from an array that has zeros in it?
I figured it out thanks.
Re: Error -1073807246 when trying to control a circulator in Labview via RS-232
I work on an Apple machine, so the answer is no, but I will see if I can find a Windows machine with 6.1.
Re: TCP/IP
does this work with both vi's on the same machine ??
Re: TCP/IP
what version of LV are you using ?
Re: TCP/IP
Thanks dan, I'll try and see how it works-out.
Re: TCP/IP
7.0 or 7Express.
Re: Mitutoyo MUX2, Digimatic Micrometer heads and Labview7
That's excellent work. Well this tests most of the cable connections, you PC and the COM port and the associated hardware and leaves only the trasmitted command. This simple test that you have performed is one of the most basic but important. Because it gives you a baseline to work from. From now on you 'know what to expect'. Look in the instructions and find the string that is used to request a reading it is probably somthing like S1 for channel 1 or similar (I can't find my sheet at the moment, I have moved since I last used it). Type this string in to the terminal program. If it mentions CR then that means Carrige Return and you do that by pressing the ENTER key. If you could post the instruction sheet it will save me looking for my copy, which I may never find. After this it will be a simple matter to get the data into Labview. You should now look into the examples with Labview and search for the parameter 'SERIAL'. This will lead you to an example 'Serial communication.VI' which is an example of how to send a command to a serial prot and aquire the results. It also has a timeout which means you don't end up waiting for ever if the remote device fails to respond (because it's disconnected or the battery is flat in the Digimatic device). The default data rates match those of the MUX so there is almost no work to do!! If your feeling brave type the command into the available control and set the VI running. It should return your data.
Corrupted llibrary due to crash! Any Idea?
Greetings, for the second time an XP machine crashed while saving a subvi of a library and corrupted the whole library. At one point I believed that a llb file was only a list to point to other subvi's but it really seems that is not the case. I was working on a new subvi that was saved into the llb when the corruption occured. I only lost the work I had done today, and am currently waiting on our support people to restore the file from a backup of a couple months ago. Any ideas how to get at this work? -- Jim Lewandowski Stanford Linear Accelerator Center [EMAIL PROTECTED] (650)926-4909
FW: Corrupted llibrary due to crash! Any Idea?
Another thing, when I try to open it with the Edit Library option the error message is: Generic file I/O error occured. Editing VI If that is any help -Original Message- From: Lewandowski, James R. Sent: Wednesday, May 12, 2004 2:15 PM To: [EMAIL PROTECTED] Subject: Corrupted llibrary due to crash! Any Idea? Greetings, for the second time an XP machine crashed while saving a subvi of a library and corrupted the whole library. At one point I believed that a llb file was only a list to point to other subvi's but it really seems that is not the case. I was working on a new subvi that was saved into the llb when the corruption occured. I only lost the work I had done today, and am currently waiting on our support people to restore the file from a backup of a couple months ago. Any ideas how to get at this work? -- Jim Lewandowski Stanford Linear Accelerator Center [EMAIL PROTECTED] (650)926-4909
record, calculate and save data periodically
Hi, I am working on a labview project. I have a continuous input data which is updated every 100ms. I need to calculate the 15 minutes average value, one hour average value of this input data and save this average values into excel file continuously. I have problem about how to calculate the 15 minutes average input data value. I have look through some example for parallel while loop, but my main problem is how to calculate the 15 minutes average values periodically and save it to the file. Thanks for your help. Fred
How to do an event only once inside a while loop?
I have a boolean control (Start Button) inside a while loop that needs to initiate TWO processes when it is activated. For the FIRST of these processes, it is imperative that once the button is pressed, the boolean control must remain in its switched state (switch when pressed) for the remaining duration of the VI. However, for the SECOND process, the same boolean control must trigger a process (some code inside a Case Structure) only ONCE, and never again. Due to various constraints, this Case Structure code is also in the same While Loop that contains the boolean control. I am trying to figure out a way to do this, but have not been successful so far. If the explanation of the problem I have provided above is not clear, here's another way of looking at the problem: I need an effect similar to the latch when pressed mechanical action of controls, but achieved programatically. The Case Structure containing my code receives a default False status until the button is pressed. After the button is pressed (and for the remainder of the program), the status is changed to True. This Case Structure is inside a While Loop, which runs throughout the length of the program. How do I make the code in the Case Structure only happen once, and not with each iteration of the While Loop? Any suggestions are appreciated.
Re: Serial port with VISA... more info...
Open MAX (Measurement Automation Explorer), expand Devices and InterfacesPorts and verify that Com1 is listed. The error code means that the session or reference is invalid. The other way to check is to click the little arrow on the right side of the VISA Resource Name. All valid VISA resources show be displayed. If the port is not listed, in MAX try ViewRefresh from the top menu and see if the port is listed. You can also expand the Software section in MAX and verify that NI-VISA is installed.
Need a Labview driver for Agilent's Signal Generator 8648D!!! Help Please
Please help me ,if anyone has this driver please email it to me [EMAIL PROTECTED]
Is there any sample code or vi that makes use of Telnet Play Script?
Is there any sample code or vi that makes use of Telnet Play Script?
Re: Output a 1MHz squarewave through serial port
jackolim wrote: Is it possible to program using labview to output a 1MHz squareware out from serial port of PC? As I recall, if you continuously transmit the character 'U' with 8 data bits, no parity and 1 stop bit, TxD will generate a square wave at the baud rate frequency. If you can set your baud rate to 1 Mhz, more power to you. Unfortunately, I know that my reference on this subject is on a slip of paper somewhere in a box full of slips of papers. Many times, the baud rate generator used in serial ports is only approximate in frequency; this must be taken into acount if you have a more exacting application.
Re: Has anyone installed LV 6.1 AND 6.02 in the same PC?
Furthermore, could anyone tell me, the way to open vi in newer version is to install the version since only earlier version in my PC?
Re: Has anyone installed LV 6.1 AND 6.02 in the same PC?
Once my friend has installed different version in the same PC, it worked well untill the system was broken up. Then, when he install the software again, all the vi writen by earlier versions have been replaced by latest one. Are there any solutions to this problems? What should be pay attention to? Thanks!
Re: coordinate system translation from screen coordinates to stage coordinates
Dr. Berns, Thanks very much for your reply. I was hoping that it would be a common enough task so that LabVIEW might have something along these lines already done. As you say, once the math is figured out, I'm sure I can get it implemented in LabVIEW. It's the math that I need help on. I think I found the text you referenced a href=http://www.amazon.com/exec/obidos/tg/detail/-/0023548568/qid=1084411777/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/102-3789695-1693725?v=glances=booksn=507846;here/a. Can you confirm that this is the text you are talking about? Thanks for your advice. Tim
Re: Why is the difference between Error Out.ctl and Error Out 3D.ctl?
Oops - 'Why is' == 'What is'
