Re: 2. Frontpanel
Hallo Waldemar, erstmal vielen Dank f=FCr deine Hilfe. Leider klappt bei mir diese Variante nicht einwandfrei. Da ich in meinem 2. Frontpanel einen Graphen anzeigen m=F6chte und dieser mir aktuelle Messwerte ausgibt, ist die Messwerterfassung in einer Schleife. Es wird nun das 2. Frontpanel ge=F6ffnet aber auch gleich wieder geschlossen, dann wieder ge=F6ffnet und danach gleich wieder geschlossen und so weiter. Hast du mir einen Tip, wie ich den Graphen nach dem Starten immer sichtbar lasse und trotzdem die Messwerte einlesen kann? Besten Dank Paul
IMAQ application; measuring gas volume
I'm looking at a possible application where I have to measure the volume of H2-gas by IMAQ, by looking at a Mercury-column, or by looking at a piston in a transparent column. Has anybody out there ever tried something like this, to give me some tips ? Maybe also about possible vendors that makes volumetric measurment eqiupment suitable for this purpose ? Martin
Re: General question for LabVIEW+iMAQ application productivity
We have received new biotech robotic system with LabVIEW control software. One of the software task is image recognition (robotic vision system). During images processing tasks memory is not used hard, but the CPU is always at 100 % utilization. Now the software is running at the computer with ordinary P4 2.4GHz. bQuestion:/b is there any sense to use Xeon system or multiprocessors system for the images processing acceleration? How deep is the LabVIEW code optimized for the different processors? The LV code isn't very optimized specific to different CPU architectures. A machine with bigger chip caches will probably give the biggest advantage. As for multiCPU, this really depends on how a LV diagram is written. I saw a presentation several years ago showing the gains a multiprocessor system would give you in a vision system. If the diagrams are written with parallelism in mind and the IMAQ VIs are made reentrant, the multiple was good, close to the number of processors. But of course, if there is no parallelism on the diagram, or the subVIs aren't reentrant, the other processors have little to work on. I'd ask the manufacturer of the biotech system if they have tried it or designed it to scale. If I'm misunderstanding and you bought it from NI, then I assume you have access to enough of the source code to make things reentrant and program for parallelism. If you have trouble writing your code for parallelism, ask more questions. Greg McKaskle
Re: Read RS-422
It depends on what you're trying to do. What options do you want to set? Are you trying to make a multi-device bus out of RS-422? One way to think of RS-422 is that it is just RS-232 with differential electrical signals instead of grounded. (And it's got tighter restrictions on voltage levels.) So if you have just a single device, you can usually just connect your RS-422 device to an RS-232 serial port and it will just work. The Tx- and Rx- end up getting grounded. However, RS-422 also defines a way of having one talker and many listeners. It's multi-drop like RS-485, but not nearly as flexible in terms of how you can address individual devices. If you're talking about needing to do that, you'll probably need to find an RS-485 card (like NI's card) to talk to your RS-422 device(s). I hope this helps. Brian
Re: Serial Compatibility VI's not working in Labview 7.0
I agree with you that serial vi's should not have been dropped ( I assume NI has their own good reasons for doing that though). I have the same issue that you have, and I have not upgraded to LabView 7 yet, waiting for release 7.01 or 7.02 that fixes all the little things I have been reading about. In my case , I have executables that use the serial vi's for customers all over, and I do not have any Visa run time installed and configured in their computers. So far I plan to stick with old versions of the applications in their case. The real issue is what if simply copying the serial vi's from 6.02 will not work with future releases of LabView, then you better start using serial visa if you want to use LabView. And since NI is listening, I hope they will address my concerns. Thank you for the info.
Install Report Generation to LV7
I would like to add LV Report Generation SW for MS Office to my LV7 installation. I already have it installed for my LV6.1 installation and I need to keep all my old versions of LV for customer support. My Report Generation CD is 1.0.1.
Re: curve fitting
Assuming that your data has a Gaussian distribution then the Gaussian (normal) curve is defined by the mean and the standard deviation, both of which can be found using the Standard Deviation and Variance function under the Probability and Statistics portion of the Mathematics menu. Based on your question I suspect that your data is not Gaussian in nature and you are wanting to make it into a Gaussian form, as in a professor grading on the curve. For this you could define a mean and standard deviation, sort the data points from smallest to largest, and then step through the array assigning values for each data point which fits the probability curve (i.e., if there are 100 data points then the 1st data point would correspond to the point below which 1% of the data lies). With this method you need to make sure that you monitor cases where more than one sample have the same value. There may be other ways to do this about which I am not aware. Hope that helps.
Re: visa Write and Read error 1073807246,1073807243,---7339 ?...
Hey Guys, I would like to make one other suggestion. In many cases just using the VISA Configure Serial Port.vi to open the port is not always the same as using the VISA Open.vi. By using the VISA Open followed by the Configure will result in more robust code. I have seen code developed in LabVIEW 5 that wouldn't work the same in LabVIEW 7, because they left of the VISA Open. I hope this helps out. -Josh
run time object creation in labview
If i want to create runtime objects like as string box, tables etc.
Can we create front pannel's references programatically ?
Does LabVIEW allows us to create the front pannels references programatically ? I know that we can use Front Panel Controls Property, from Vi server, but this property gives me all the references. I want to generate the references of some few front pannel's ojbects.
RE: Wait 0.5 milliseconds?
There are a number of hardware-based solutions for this problem, all involving the use of analog or digital waveform acquisition or generation, or use of counters and occurrences, but a software solution would certainly be welcome. From working with LVRT, I seem to remember that there are instructions that allow one to access Pentium clock count from LVRT - that's how one does benchmarking under LVRT. Maybe some Windows guru could write a VI (and possibly a DLL) that would allow one to configure and generate an occurrence based on the number of elapsed CPU clock pulses? Yes, I know, it would be processor-specific, but for many of us, having something just for Pentium is better than nothing! Sergey Liberman [EMAIL PROTECTED] Solidus Integration http://solidusintegration.com
RE: Wouldn't it be nice if you could put a tab control in a clust er
I seem to recall that came up awhile back and the (general) response from the list was why would you want to be able to do that? :) Johann Junginger Research Scientist Xerox Research Centre of Canada [EMAIL PROTECTED] Ph: (905) 823-7091 x306 Fax: (905) 822-7022 -Original Message- From: Chuck Lippmeier [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 09:58 To: Info LabVIEW Subject: RE: Wouldn't it be nice if you could put a tab control in a cluster Self explanatory Chuck Lippmeier
ActiveX container resizing
Hi All, I'm running in to front panel sizing issues when I run my program on different resolutions. I have the maintain proportions and scale on window resize options checked in the vi properties but my activeX container for windows media player doesn't seem to be following that rule exactly. I have it placed on top of a raised box decoration where it fits the box perfectly in one resolution but it doesn't scale like the raised box does at diferent resolutions. So, is there an option I am missing? If not, is there a way I can programmatically detect the size of the of the raised box decoration so that I can manually set the size of my activeX container via a property node? Thanks in advance for any info, Gc.
Re: Can we create front pannel's references programatically ?
Unless you create a reference manually from the control the only way to get the reference is to use the front panel controls property AFAIK, however - extracting the reference to a specific control from that array is easy. If you know the index just wire the array to an index array function and give it that index...if you only know the label of the control read the label.text property of the references, search for the index of the name...and wire that index to an index array function with the control references array as input - voila, you have the specific reference you needed. The retrieval of the reference array and the name array may be effective to only do once and then keep them in shift registers. If you make a functional global that take a name as input and give out the reference; you can access them globally. Add a VI name to the search input and you can have the functional global serve references the controls of multiple panels.
RE: Wait 0.5 milliseconds?
Hi, I am currently investigating sub millisecond time stamps in Windows using two functions in kernel32.dll (QueryPerformanceFrequency and QueryPerformanceCounter) , I came across this page which was of interest to me, it may also be relevant in your application as you might be able to use a calibrated for loop to give you a delay. http://www.wideman-one.com/gw/tech/dataacq/labview/perfcounterdemo.htm Hope this helps, Richard Hill. -Original Message- From: E. Blasberg [mailto:[EMAIL PROTECTED] Sent: 06 January 2004 13:23 To: [EMAIL PROTECTED] Subject: Wait 0.5 milliseconds? Hi All, I'm going to assume that the answer is no (at least if one is not using LabVIEW Real-time), but does anyone know if it's possible to set a delay time of less than 1 millisecond? Here's the problem: we set a switch (using a DIO card), wait n MICROseconds (called the Switch Settling Time) and then trigger a Receiver to measure a value. Currently this is done in C++. Naturally I'd like to be able to say that LabVIEW can do you anything you can do better. Sadly, I think this time I can't. Any comments? Thanks (in advance), E. Blasberg iDAQ Solutions Ltd. This e-mail is intended for the recipient only. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely upon this e-mail. If an addressing or transmission error has misdirected this e-mail, please notify the author by replying to this e-mail. Recipients should note that all e-mail traffic on MOD systems is subject to monitoring and auditing.
Re: visa Write and Read error 1073807246,1073807243,---7339 ?...
Yes... absolutely... how could I miss that... ;o)
RE: Wouldn't it be nice if you could put a tab control in a clust er
I never saw the post that started this... but just in case the original poster still needs an answer Tab Controls can contain Controls AND Indicators whereas a Cluster can contain Controls OR Indicators... Dan Bookwalter N8DCJ Hi-Stat a Stoneridge Co. 345 South Mill St. Lexington, Ohio 44904 (419) 884-1219 Phone (419) 884-4172 Direct (419) 884-4195 Fax [EMAIL PROTECTED] -Original Message- From: Junginger, Johann [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 10:55 AM To: 'Chuck Lippmeier'; Info LabVIEW Subject: RE: Wouldn't it be nice if you could put a tab control in a clust er I seem to recall that came up awhile back and the (general) response from the list was why would you want to be able to do that? :) Johann Junginger Research Scientist Xerox Research Centre of Canada [EMAIL PROTECTED] Ph: (905) 823-7091 x306 Fax: (905) 822-7022 -Original Message- From: Chuck Lippmeier [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 09:58 To: Info LabVIEW Subject: RE: Wouldn't it be nice if you could put a tab control in a cluster Self explanatory Chuck Lippmeier _ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to [EMAIL PROTECTED]
library sub vi's
I need some sub vi's- Ai aquire waveform.vi,Ai group config.vi,Ai hardware config.vi,Ai buffer config.vi,Ai clock config.vi,Ai single scan.vi
RE: Wouldn't it be nice if you could put a tab control in a cluster
At 09:57 -0500 01/07/2004, Chuck Lippmeier wrote: Self explanatory Chuck Lippmeier Self-Explanatory thread: http://messages.info-labview.org/2003/04/28/20.html -Scott
Operating System issues
Just thought I'd pass along this article which some of you may find useful. http://linuxdevices.com/articles/AT4627965573.html Although not LabVIEW related, it deals with software timing issues and understanding how operating systems work. It is somewhat related to several recent info-LabVIEW topics and just too good not to pass along. John H.
Re: library sub vi's
All of these should be present in your LV installation. If these are absent from your installation then I suggest that you reinstall LV so that these vi's will be installed.
Re: Monitoring Smooth Muscle activity
Title: Message I have no expertise in this discussion but is it possible to use Laser Holography to find the stress point in the muscle? It is a Non Destructive Testing technique used for finding stress loads in objects visually using laser interferometry.It shows the complete surface stresses whether flat or curved. We used to use this technique in measuring stress forces on turbine blades and you could visually see the stress points dynamically or statically. I can't remember the name of the device we used but this is an example of a system by doing a search on "laser holography stress" http://laserndt.com/prod_021_portshear.htm Jeff Christensen IP Networks Motorola, Broadband Communications Sector [EMAIL PROTECTED] www.motorola.com/broadband
Re: library sub vi's
These sub-vis are part of the NI-DAQ driver install. Either you have not yet installed NI-DAQ or they have been deleted. You can download the currnet NI-DAQ a href=http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C128D?opendocumentnode=132060_US;here/a for all OS's. Ed
global variables
Hi, I wrote two VI's which communicate via global variables. This works fine when i let both run but if i create two binaries (exe files) this would not work anymore. Does enybody know why? Is there a special point i have to care when i create the exe files? Max
RE: Wouldn't it be nice if you could put a tab control in a clust er
List, I was the original poster. I just had to send it twice since I forgot to remove my vcard the first time and the reflector won't accept attachments. Since I didn't remove the RE: on the second time it just looks like a response. I was just using a Tab control with a lot of only controls on it. I was just wishing I could wrap the whole thing in a cluster so I could clean up my diagram. Just an idle comment. Thanks for all the feedback. I guess it will never happen due to the possibility that a tab can have both controls and indicators, as you say. Maybe it would be nice to have an array of references property to the controls and indicators on a tab control so you could pass a reference to the Tab into a sub VI and then get access to the controls from the array property. However, I like the link Scott gave to the Stephen R. Mercer msg. If I get time I'll see if I can make that work. This is probably getting too complicated and I should get back to the real work I'm try to do. Chuck Lippmeier -Original Message- From: Bookwalter, Dan [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 11:21 AM To: 'Junginger, Johann'; 'Chuck Lippmeier'; Info LabVIEW Subject: RE: Wouldn't it be nice if you could put a tab control in a clust er I never saw the post that started this... but just in case the original poster still needs an answer Tab Controls can contain Controls AND Indicators whereas a Cluster can contain Controls OR Indicators... Dan Bookwalter N8DCJ Hi-Stat a Stoneridge Co. 345 South Mill St. Lexington, Ohio 44904 (419) 884-1219 Phone (419) 884-4172 Direct (419) 884-4195 Fax [EMAIL PROTECTED] -Original Message- From: Junginger, Johann [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 10:55 AM To: 'Chuck Lippmeier'; Info LabVIEW Subject: RE: Wouldn't it be nice if you could put a tab control in a clust er I seem to recall that came up awhile back and the (general) response from the list was why would you want to be able to do that? :) Johann Junginger Research Scientist Xerox Research Centre of Canada [EMAIL PROTECTED] Ph: (905) 823-7091 x306 Fax: (905) 822-7022 -Original Message- From: Chuck Lippmeier [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 09:58 To: Info LabVIEW Subject: RE: Wouldn't it be nice if you could put a tab control in a cluster Self explanatory Chuck Lippmeier _ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to [EMAIL PROTECTED]
Re: library sub vi's
Ed, Thanks for correcting me. Since I install LV and NI-DAQ at the same time I tend to think of them as a single install. John
Re: serial VISA not sending output until closed
So far I have found nothing that helps. I have tried all of the wiring configurations given, and still have the same result. The data is sent to the buffer as it is written according to NI spy, but nothing actually exits the port until after VISA is closed, even with flushing the buffers. Is VISA waiting for some sort of command? Is there a bug in my software? I could close the VISA session, but I would still want an accurate count of how many pulses have been sent at a given time during my scan. Thanks
Multiple text entries on an XY plot (Vector plot), Possible??
Hello, using LabView 6.1 here and have question for the experts. I have an xy graph that I am sending a an array of clusters that to cut this short produces a vector plot with size of the arrows and direction indicating magnitude and direction while the color is referenced to a color table related to standard deviation. Anyway I would like to write the value of velocity as text near each arrow. Is their a convenient way of doing this? I have around 50 vectors to note so I am hoping to be able to pull the strings from a delimited file and build an array and bundle them to coordinates that i can feed the graph somehow..any advice would be appreciated
ISA to PCI
Hi all, Thanks to all for your suggestions on the migration form ISA to PCI. Thanks, Kalyan Graduate Research Assistant Mechanical Engineering Virginia Tech - 24060 Ph: 540-231-1271(O)
