RE: [W] unknown DLLs & executables
But if you don't know what will be loaded by your user later on...? I am working with a situation where users can link in their own VIs dynamically. At 12:52 AM -0500 3/23/04, Michael Aivaliotis wrote: Andrew, When building an app, you must specify dynamic VI's with the "add dynamic VI" button in the application builder. This triggers the app builder to include any related DLL's or extra VI's... NO? Michael Aivaliotis Now, what happens when your application loads a VI dynamically... and it needs a DLL? The load will fail unless the DLL is nearby... in the "data" directory. Still not a problem if we know with some certainty which DLLs might be needed. But suppose we do not? In that case, must the entire "resource" directory contents be moved to "data", in order to support any possible VI? And if that unknown VI uses/needs vi.lib support, then should the entire vi.lib directory also be placed next to the executable? Is this allowed under the LabView EULA? - Andrew Johnson - WireWorks West
RE: [W] unknown DLLs & executables
Andrew, When building an app, you must specify dynamic VI's with the "add dynamic VI" button in the application builder. This triggers the app builder to include any related DLL's or extra VI's... NO? Michael Aivaliotis > Now, what happens when your application loads a VI dynamically... and > it needs a DLL? The load will fail unless the DLL is nearby... in the > "data" directory. Still not a problem if we know with some certainty > which DLLs might be needed. > > But suppose we do not? In that case, must the entire "resource" > directory contents be moved to "data", in order to support any > possible VI? And if that unknown VI uses/needs vi.lib support, then > should the entire vi.lib directory also be placed next to the > executable? Is this allowed under the LabView EULA? > - Andrew Johnson > - WireWorks West
[W] unknown DLLs & executables
Normally, when making an executable, LabView will copy any DLLs that the linked subVIs required to a data directory that can reside next to the executable. This is fine, thank you NI. Now, what happens when your application loads a VI dynamically... and it needs a DLL? The load will fail unless the DLL is nearby... in the "data" directory. Still not a problem if we know with some certainty which DLLs might be needed. But suppose we do not? In that case, must the entire "resource" directory contents be moved to "data", in order to support any possible VI? And if that unknown VI uses/needs vi.lib support, then should the entire vi.lib directory also be placed next to the executable? Is this allowed under the LabView EULA? Thanks for any thoughts from people that have already worked these wires... -- - Andrew Johnson - WireWorks West
Re: Where can i find the classID list for Labview 7.0
As PJM Labview already knows there has been a special forum setup for related discussions on LabVIEW Scripting. PJM has also kickstarted the discussions there by posting some bonus code. I invite all who are interested in playing with these new discoveries to join in on the fun here: http://forums.lavausergroup.org/index.php?showforum=29 Thank You Michael Aivaliotis http://forums.lavausergroup.org
Re: Is the conflict happening when I used two same subVIs in VI?
Without further details, it's almost impossible to provide anything useful here. However, I think the relevant topic is reentrant VIs, or reentrancy in LabVIEW. I would suggest reading the "Simultaneously Calling SubVIs from Multiple Places" section of Application Note 114 in the DevZone: http://zone.ni.com/devzone/conceptd.nsf/webmain/D2E196C7416F373A862568690074C759?opendocument Regards, John Lum National Instruments
[W] Data link Serial port
Friends I am writing a data link to communicate between a PC running LV 6.0.2 and an industrial computer. The link on RS232C will run @ 9600 baud and the throughput is such that I'm using 1/4 to 1/3 of capacity. The industrial computer sends the data and has a 500 byte buffer each for send and receive. But the data is all one way from the industrial computer to the PC. The PC will save this data to disk continuously and also present displays etc. It sounds like there are many ways to operate the serial port in LV (maybe VISA, maybe direct port manipulation, more likely old-fashioned serial port VI's?. I haven't done much checking but I wondered what the consensus was for the best method for this type of application. Since PC's only have a buffer of a few bytes, I would prefer to have something automatically handle the interrupts and have a big input buffer that I just read from time to time (say every 50 to 100 msec). I used to do that interrupt handler stuff in assembler in the DOS days. The LV application will be compiled/built to an EXE. I'm writing both sides of the link so I can impose whatever design I want. TIA R. Glenn Givens P.Eng. Innovention Industries Inc. Burlington, ON, Canada www.innovin.com
Re: Need help duplicating rows of 2D boolean array
Sorry, like I said, im fairly new to this also and im out of ideas. Perhaps you should repost your question and stipulate the version of VI that you using.
Re: how to control a digital projector with labview
Tristan J <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > John, > Unfortunately Labview does not offer the support to directly control a > second display device. I would recommend using the dual monitor > configuration and letting the operating system control what image is > displayed on the projector. > > Regards > > Tristan J > Applications Engineer > National Instruments Sounds like a good application for an ActiveX control.
Re: Does anyone know of resources for IBM ISA AD/DA cards?
Ben <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Hi Bill, > > Have you concidered using the microphone input? > > That will let you do analog in on most PCs. > > Still trying to help you get started. > > Ben The game port also provides analog input potential.
Re: Serial communication with Labview 7 and multiple COM ports
COM Ports have had problems in pc's ever since IBM's Peanut. Correct use depends on RS232 parallel communications as well as serial communications. UARTS, the IC's that provide serial connectivity, can lock up in ways that require power-on resets. Very few serial devices use the RS232 handshaking timing correctly. Your ports can be configured to cause IRQ and address conflicts. If you use USB devices or a modem, a conflicting IRQ may not be directly associated with the serial port. You can have two devices attempting to use the same IRQ--an idea that only works well in theory not generally in practice. Your ports and cards must be configured consistently in BIOS as well as Windows to operate correctly. In addition, some serial cards have straps or software configurable settings that must be addressed. Hope that this gives you a few places to look.
Re: How do I access existing visual basic modules (.bas) files in LabView
Dennis Knutson <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > I'm not sure why you want to access the .bas files. There is no way to > convert basic source code to LabVIEW. Some things like declarations, > memory allocation, are not required in LabVIEW or are done for you by > the LabVIEW compiler. Constants, local and global variables, user > defined types in the form of custom controls, all exist in LabVIEW but > in general, are much easier to use. Maybe if you post a snippet of VB > code, someone can translate it into LabVIEW. Labview provides a way to use custom ActiveX controlls. This would be the preferrend interface. Marty
Re: Controlling Second Computer Keyboard using LabVIEW
craigr54 <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Is it possible for my computer with LabVIEW installed on it to control > a different computer booted only from a floppy (the floppy contains > programs written in FOURTH used to test hard disk drives therefore the > second computer has no operating system) The hard disk drive being > tested is connected to the IDE 1 connector of the floppy booted second > computer. Currently, the operator has to enter the FOURTH commands > via the second computer's keyboard. I recall a device called a "Wedge" that was inserted between a keyboard and pc to provide input from a barcode scanner. This device should also provide access from a second serial port on the Labview pc. Marty
properties of XY graph
Dear list, I have a multiplot XY graph. Is there a way to make all plots blink? (the 'binking' property seems to work only for the 1st plot). also, is there a way to change the line and point types of all the plots using properties? (again, I seemd to be able to do it only to the 1st plot). thanks. -- Timothy Wen Applied Physic Lab/U of W 1013 NE 40th St., Seattle, WA 98105 206-543-1300 (Voice)/543-6785 (Fax)
Re: Alternative info-LabVIEW list
On 03/22/04 14:04:17, "Bookwalter, Dan" wrote: > I would like to see Info-LabVIEW on a news (NNTP) > server. I sure hope this doesn't happen... I have tried and tried to get our IT guys to open up NNTP for me. They simply won't do it... I am sure there are many others in the same situation You can use Google for reading and posting. I've only used it for reading/searching archives so I can't comment on its ease of posting. Does this settle your connection problem? Let me know of any other obstacles using a news server. -Kevin
USB-serial
Hi, has anyone used a USB-to-mulitiport RS232 adaptor with LV ? i need up to 8 serial ports, or 2 of 4-ports. thanks. -- Timothy Wen Applied Physic Lab/U of W 1013 NE 40th St., Seattle, WA 98105 206-543-1300 (Voice)/543-6785 (Fax)
Re: WebCam vi?
This is exactly what I was looking for. Thank you for the info. Michael Noll-Hussong wrote: > In order to use USB-webcams with LabVIEW you might look here: > > http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=137&HOID=50650005002D5B0100&HTHREAD=88877&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
your suggestions for the list
Michael I like your idea of the person asking the question to summarize the general conclusions & alternatives in one final email (unless there were just 1 or 2 responses of course). I have done that sometimes and the response in my "Sent Items" folder is there for me as a summary too. R. Glenn Givens P.Eng. Innovention Industries Inc. Burlington, ON, Canada www.innovin.com
RE: Alternative info-LabVIEW list
Hi, I've been trying to follow the suggestions. It looks like two other, separate threads of a similar content have started up. I may be duplicating some of their comments. I'm not a big fan of mailing lists for a number of reasons. Searching their contents is never a trivial task. Threaded topics are easily broken. They get mail bombed, spammed, etc. I would like to see Info-LabVIEW on a news (NNTP) server. The beauty of comp.lang.labview is that I can read and post from a news reader and search its archives with Google. No need for a web interface. I know, news groups can also get spammed and flame wars are more common, I just like them better. I was looking into how to set one of these up for LabVIEW discussions. A group like alt.comp.lang.labview ... or something like that. Any plans for something like this? -Kevin
WebCam vi?
All, I'm looking for any information regarding the use of webcams with Labview. I'd like to design a face recognition/motion detection type vi. The sites I have found only provide sdk's for qualified developers. Can anybody point me in the right direction for such information. I'm using Labview 7.0. Thank you for any help you can offer.
RE: Let's have election!It is fun:)
Michael Porter Porter Consulting, LLC. " ... after all He's not a tame lion... " I guess my vote would fall on the side of maintaining the basic functionality the same (low-bandwidth). If somebody needs a way of posting examples of code or such there are at least two other LabVIEW-specific channels for that sort of traffic. Mike... Michael Porter Porter Consulting, LLC. " ... after all He's not a tame lion... "
Re: prorgam works in Diagnostics mode not in natural mode
GUys, thank you for your kind response. I am running an HP 4284A precision capcitance voltage meter and a keithley voltage control meter. regarding posting of the actual code, I wonder if I can do that because Labview programming in done in graphics mode (atleast dummys like myself do it in graphics mode).
Re: Capture and manipulate rs232 binary data
Use Number to Boolean array. "jorge" <[EMAIL PROTECTED]> escreveu na mensagem news:[EMAIL PROTECTED] > Hello, I am very new to lab view 7 and I need to do the following for > work. I am using the rs232 serial port on the computer to communicate > with a prototype circuit. The communication is a simple 8bit (byte) > of 1's and 0's to and from the computer. How do I take this byte and > sepearte it to individual bits, so I can display the results in the > front panel? I would need to both create the byte from 8 individual > controls then concatinate the bits, and send through the serial port. > Also take the byte from the serial port and seperate the individual > bits. Thanks alot for any help I can get in pointing me in the right > direction.
Re: Let's have election!It is fun:)
( Sorry in advance to all the international list reader who probably won't get this joke, but... ) I heard a rumor somewhere that there are many world leaders who have privately told Michael A. that they hope he takes over the list... Michael Porter Porter Consulting, LLC. " ... after all He's not a tame lion... "
moving the list
I think Scott & Michael and, if necessary, a few of the main contributors to the list should get together (electronically) & decide who will take over the list. We need to make sure there's just 1 list. R. Glenn Givens P.Eng. Innovention Industries Inc. Burlington, ON, Canada www.innovin.com
RE: LabSQL
The answer to your question depends on the database you're inserting into.
For example, you can pass data to Oracle in any format you want as long as
you tell it what the format is (and I would suspect that other DBMS are
similar--though the particulars may vary).
Assuming a table called "blah" with a single column "blah_dttm", in Oracle,
the SQL syntax for an insert would be something like:
INSERT INTO blah
(blah_dttm)
VALUES
(to_date('00:50:29 18/03/04','HH24,MI,SS dd/mm/yy'));
The part in the first set of single quotes is the string specifying the time
and date. The part in the second set of single-quotes is a string telling
Oracle how to interpret the first string. In this case:
HH24 = 24-hour clock hour
MI = Minutes
SS = Seconds
dd = Day
mm = Month
yy = 2-digit year
Hope this helps...
Mike...
Michael Porter
Porter Consulting, LLC.
" ... after all He's not a tame lion... "
Re: Let's have election!It is fun:)
At 2:51 PM -0500 3/17/04, [EMAIL PROTECTED] wrote: >Let's have election! Primary?? It is fun:) > I'm from Florida, so I'll count the votes! Kathy Harris taught me how to do it! -Scott
Hello again...
To paraphrase the old movie... "...I'm ba-a-a-ck..." Things have been crazy in my world the last year and am just now getting back to getting reconnected to the list (not sure how I got off, perhaps an email weirdity). In any case, the guy with the tag line about tame lions is back, and hoping everyone has been well in my absence. Mike... [EMAIL PROTECTED] " ... after all He's not a tame lion... "
Serial Protocol Analyzer
For port monitoring, look for portmon in google. R. Glenn Givens P.Eng. Innovention Industries Inc. Burlington, ON, Canada www.innovin.com
RE: Alternative info-LabVIEW list
Ok, I will be public about this. I have offered to take over at least two of Tom's lists and host them here at the lab using the same software that he uses to host them. If Michael wants to do this that is fine, since I also use the Igor list I figured that I could do this with the least disruption. I (and all of us) are waiting for Tom to decide what is the best way to transfer this. In the meantime the system seems to be chugging along (those dang Macs just don't quit!). -Scott At 8:39 PM -0500 3/16/04, Michael Aivaliotis wrote: >As far as we can tell, it's just a matter of time since Tom's personal >server that hosts info-LabVIEW goes "tits up". In the long-term we just >want one list of course. Since Tom has asked for help in transferring >the list, I am just stepping up to the plate and making the first move. > >If there is anyone out there that wants to host the list or has any >other prior arrangement with Tom then please feel free to say so. I can >assure everyone that the new list will follow in the same footsteps as >the previous one and maintain the independence that was inherent in the >previous list. It will also stay a text based list and prohibit >attachments. In addition, it will be monitored and maintained on a daily >basis and will be in the hands of active LabVIEW users.
RE: Alternative info-LabVIEW list
OK, my turn... I believe that Michael Aivaliotis would be an excellent info-labview list administrator. He has repeatedly demonstrated that he is technically capable of this task through his management of the LAVA mailing lists, discussion forums, and the NI Week Blog. I have found him to be very accessible by email/IM and ever-present on the various LabVIEW community forums. I am sure that he would keep the info-labview list up and running like clock-work. Best Regards, -Jim Kring Scott Hannahs <[EMAIL PROTECTED]> said: > Ok, I will be public about this. I have offered to take over at > least two of Tom's lists and host them here at the lab using the > same software that he uses to host them. If Michael wants to do > this that is fine, since I also use the Igor list I figured that > I could do this with the least disruption. > > I (and all of us) are waiting for Tom to decide what is the best > way to transfer this. In the meantime the system seems to be > chugging along (those dang Macs just don't quit!). > -Scott > > > At 8:39 PM -0500 3/16/04, Michael Aivaliotis wrote: > >As far as we can tell, it's just a matter of time since Tom's personal > >server that hosts info-LabVIEW goes "tits up". In the long-term we just > >want one list of course. Since Tom has asked for help in transferring > >the list, I am just stepping up to the plate and making the first move. > > > >If there is anyone out there that wants to host the list or has any > >other prior arrangement with Tom then please feel free to say so. I can > >assure everyone that the new list will follow in the same footsteps as > >the previous one and maintain the independence that was inherent in the > >previous list. It will also stay a text based list and prohibit > >attachments. In addition, it will be monitored and maintained on a daily > >basis and will be in the hands of active LabVIEW users. > > --
Re: LabView 7 Express and Imaq Vision Builder 6.1
Mike, 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. Minty
Re: Controlling Voltage Ramp Time
Russell, Thanks for the reply. What I am trying to accomplish is creating a test fixture with variable voltage ramp times of the +5VDC output of my power supply... so yes, I am trying to create custom waveforms using Labview. Any more expamples you have access to are greatly appreciated. Thanks Again! Ziad "Russell G." <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Ziad > > There is a great example in Labview called Output DC Volts.VI. Go to > Help > Find Examples. If you search on DC you should be able to > find it. > > This example will at least give you an idea of how to start outputting > DC voltages on your power supply. You can then modify your program > accordingly. > > What do you mean when you write that you want to Control ramp times > of +5V up to 500ms+ ? Are you trying to create a custom waveform with > your DC power supply? Any other information you can provide would be > helpful. > > Russell G. > NI Applications Engineer
prorgam works in Diagnostics mode not in natural mode
HI genius people of Lab view, Here is a situation that will test your wiz. A labview program that was working fine in a slow computer--333MHz does not work in a 2.4GHz computer. However, if I run it in diagnostics mode (ie with that little light bulb on), then it works fine. I have tried putting delay all over the place but it was of no use. Could you please suggest why the program is acting funny and how I may be able to get around it. Thanks. Best wishes. Roshan.
How do I determine available COM-ports in LabVIEW 7?
Hi! I need a nice and easy way to determine available COM-ports from my LabVIEW application? Best regards Thomas Gajda Joergensen YORK Marine & Controls
Re: How do I determine available COM-ports in LabVIEW 7?
Hi Michael! Thank you for your answer. I think I did not express myself clear enough so I will rephrase my question: How do I determine the available COM-port at runtime? I need to get a list of available COM-port programatically (or what it is called in english) Thomas "MVestjens" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Hi > > Take the "Visa Resource Name" Control. > On the front panel -> all controls -> I/O -> Visa Resourse Name. > > You will have a pull down menu which lists all available COM (and LPT > ports). These are derived from the settings in the Measurements and > Automation Explorer. > > I hope this helps, > Michiel.
Controlling Voltage Ramp Time
I am new to LabView and am currently running 7.0 professional. I am looking for guidance, reference design, etc. that will enable the following: 1. Use of an HP (now Agilent) E3631A power supply 2. Control ramp times of +5V up to 500ms+ I have installed all the required drives and have established communication with the E3631A. Best Regards, ZA
RE: Table cell width: settable programattically in terms of number of characters?
Don, Unless you use a fixed-with font, any kludge you come up with will be inexact. You may get pretty close to the actual width, but there will always be times when you will over or under shoot the size. And if you want to change font size, etc., you'll have to revisit your algorithm or account for it up front. Fortunately there is a function that will give you the dimensions of a text rectangle. It is "Get Text Rect.vi" and is located in the Picture Control tools (Functions>>Graphics & Sound>>Picture Functions). It should be self-explanatory from there. Good Luck, Scott -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Don J Roth Sent: Tuesday, March 02, 2004 10:40 AM To: Info-LabVIEW Mailing List Subject: Fwd: Table cell width: settable programattically in terms of number of characters? >Date: Tue, 02 Mar 2004 11:39:44 -0500 >To: "Info-LabVIEW Mailing List" <[EMAIL PROTECTED]> >From: Don J Roth <[EMAIL PROTECTED]> >Subject: Table cell width: settable programattically in terms of number of >characters? > >I am currently have a table control with column headers and I would like >to have all of the cells of any particular column to have their widths >equal to the number of characters in the header string of that column Is >this possible to do programmatically? > >Currently, I see the cell width and height may be settable (despite what >property help says) but only in terms of pixels. I suppose I could >determine the ratio of pixels to character size so as to cludge a way to >come up with cell width in terms of number of characters. Any comments? > >Thanks, > >>Don
Opening and Reading
Bruce Thanks, I missed that the connection (bad pun). I tried your suggestion on my test vi and it worked as you predicted. I will check carefully the write function before I change anything. Paul -- Paul A. Rochefort Chalk River Laboratories AECL -Original Message- From: Bruce Ammons [mailto:[EMAIL PROTECTED] Sent: 01 March, 2004 15:33 PM To: 'Rochefort, Paul'; 'Info-Labview (E-mail)' Subject: RE: Opening and Reading The 1 is actually wired to the deny mode, not the open mode. I would probably save a copy of the vi with a new name and change the open mode to read only. I suspect that would fix it. You would need to be careful though, because you would have to use the original version when writing files. Bruce -- Bruce Ammons Ammons Engineering www.ammonsengineering.com (810) 687-4288 Phone (810) 687-6202 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rochefort, Paul Sent: Monday, March 01, 2004 2:47 PM To: Info-Labview (E-mail) Subject: Opening and Reading My problem is opening read-only files using the waveform file open vi. At the heart of this vi in the "Open file" primitive with mode input set to 1 (open). When I try to open the file, I get the following error "Error 8 occurred at a Open File in Myvi". To confirm my assumption Open file primitive was the source of the problem, I did a quick test trying to open a .txt file set to read-only and got the same error message. (The file are set to read-only because the file were burned to a CD and then transferred to another computer for analysis.) Obviously I am not first to discover this behaviour so I checked the Info-search without any luck. Is there a good way or utility to opening and reading this type of file while preserving its protective state. I running Windoze 2000 with LabVIEW 7.0 (Oh how I wish I could use my mac) Paul A. Rochefort Chalk River Laboratories AECL
[w] making elements of a Boolean array invisible or disabled
Friends How do I make individual elements of a Boolean array invisible or disabled but not the entire array? I have LV6.0.2. I thought I did this a long time ago but can't find it. R. Glenn Givens P.Eng. Innovention Industries Inc. Burlington, ON, Canada www.innovin.com
LabView 7 Express and Imaq Vision Builder 6.1
I'm new to Labview and Imaq Vision, in fact, they were installed only a few hours ago. I won't bore you with the reasons why my company has purchased this software, but I'm the one stuck with learning to use it. Does anyone on this board know how to make Imaq Vision work with a non NI capture card? I have a non NI card installed but, as Imaq Vision doesn't recognise the card I can only run simulations. Thanks in advance for any help. Minty
Re: BUGs
> But what metric is used on the space of cost/risk/benefit? Of course, > ultimate responsibility of the corporation to its owners means that > cost/risk/benefit are all judged in terms of fiscal income. The argument > that this is bad or good is irrelevant, but this is the standard against > which those terms are judged. The point of the interview I posted was that > bug-fixing is low benefit, high cost using that metric. For me, the high > cost is mistakes controlling equipment which for one of the long standing > bugs (which is high cost, low return) is that valves get modified on actual > equipment at times the operator did not intend to actuate things. This > involved a rather kludgy chunk of code to get around, and then it is high > cost (to me) to maintain, since explaining this obscure code takes > time/effort/cost.This end user cost needs to be translated to cost to NI. > This information about causing a user to unintentionally modify a valve is exactly the type of information that I was talking about at the bottom of my post. The metric isn't a numerically accurate technique, but the bug reports are classified as product liability, crash, internal error, incorrect behavior, cosmetic, and suggestion. This is often something of a guess until the bug can be reproduced, and even then, it is a fuzzy classification since under the right circumstances, anything could be elevated to a product liability. So, this is where the human element comes into play. You look at the typical result of this bug on the Average user. If many users will be affected, you may round up. If the user has to stand on their head to even find the feature that the bug is in, then it is rounded down. It is common for the values to wiggle around as a bug is investigated, and one possibility is that a bug gets deferred to be fixed in a later release. Before release, the deferred bug reports get reviewed by some pretty picky members of R&D management, and again, a balance is struck between delaying the schedule and shipping with known bug reports. I understand that nobody likes being a squeaky wheel, especially you, but giving a good explanation so that the right triage choices are made is once again the best advice I can give. To try and draw an analogy, designing defect-free software is hard and expensive, sort of like designing rockets or planes that never fail. And even with big budgets and big brains, NASA and the other space agencies around the world aren't even able to achieve that goal. What we can do is set up a system that makes sure that bug fixing time is as effective as possible, then set up a cost system that encourages the fixing of bugs and innovative products. That system includes forums like this, web sites that list pesky bugs that continue to get deferred, etc. Like I said, this is a difficult conversation to have over email. If you have specific questions, I'll try to answer them, and if you make it to NIWeek again, we can have a better medium for philosophical discussions. Greg McKaskle
Re: text selection - text color bug?
> It may not be considered a bug, but it is a royal pain in the you know what! > It essentially makes the ability to add color highlighting to changing text > too difficult to be worth the effort in most cases. (in my opinion) > This is doable with the reference to the string and the string to place into it. The problem really comes down to one of policy. Are the character locations of the colored text what is important, the line count/word count, or is it the phrase that needs to be maintained. In the end, for UI, probably the right thing to do is support html or some other markup codes within a string. The issue here is that this string is likely to head from a terminal or connector pane to file or serial port or file. Marked up strings are not too nice for that, so having separate formatting codes allows for fancy UIs, but it makes it difficult to apply new text and keep the old formatting. Greg McKaskle
RE: Converting integers to binary
David, In the odd case the software you're using is expecting full zero-padded 8-bit data (such as 00011001,1110, etc.) then use %08b as your format string. Regards, Scott Menjoulet -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Hannahs Sent: Wednesday, February 18, 2004 2:46 PM To: David Macleod; [EMAIL PROTECTED] Subject: Re: Converting integers to binary At 15:47 + 02/18/2004, David Macleod wrote: >Hi there, > >I'm a new LabVIEW user and I'm using it in my final year University project (an ultrasonic scanner). Basically I am storing an array of data in LabVIEW and I want to convert it to a suitable state for the imaging software. The software requires a text file which contains the data in 8 bit binary numbers, comma seperated. The array I currently have stores integers. Is there any way that you know of to convert integers to binary in LabVIEW? Or if there's some function that writes binary to text files? I'd appreciate any suggestions anyone has on this. "array to spreadsheet file", function and give it a %b format string with a "," (comma) delimiter. Convert your array to U8 first so it is only 8 bit values. -Scott -- Dr. Scott Hannahs, Head of User Research Instrumentation http://sthmac.magnet.fsu.edu National High Magnetic Field Laboratory, Florida State University 1800 E. Paul Dirac Dr., Tallahassee FL 32310, (850)644-0216/FAX 644-0534 "Mac users enjoy a love-hate relationship with Microsoft--in which love is defined as 'resigned tolerance' and hate as 'lava-hot rancor fueled by the fire of a thousand burning suns.'" -- Macworld
Serial comms
Mona Here is a software port monitoring program for Windows. They also have file monitor and registry monitor. http://www.sysinternals.com/ntw2k/freeware/portmon.shtml R. Glenn Givens P.Eng. Innovention Industries Inc. Burlington, ON, Canada www.innovin.com --- On Feb 13, 2004, at 11:30 PM, Scott Hannahs wrote: > Many systems have a way of snooping on serial port communications. I > can give you a good way for Mac OS X.. But I am going out on a > limb and guess that isn't your host system! :-) Others can suggest > software for various winders versions. Okay, I give... what is the good way with Mac OS X? cheers, Mona PS Funny about the various (repeatedly reported) unfixed bugs... I believe in the tooth fairy and that the bugs will get fixed one day
MAC driver for PCI-MIO
Hi Is there anybody who has written a driver for MAC OSX10.2 for the following cards PCI-MIO-16XE-50 and DIO 96 Any help Jürgen GKSS research center Jürgen Buhrz Max-Planck-Str. 1 21502 Geesthacht Germany Tel. +49 (0)4152 87 2708 FAX +49 (0)4152 87 2727 Mail [EMAIL PROTECTED]
Re: Datasocket, Linux, and C
"George Gatling (Contractor)" <[EMAIL PROTECTED]> said: I have a datasocket server (WinXP) that is currently handling six labview applications (also WinXP) quite happily. I want to add one more app, written in C and running on linux, that will publish to the datasocket server. Being a simple labview programmer I don't know much about the ins and outs of include files and all that stuff. Beside me is a C programmer that doesn't know diddle about Labview. heh, what fun. Can someone bridge our knowledge gap and explain what we need to get a C app on linux talking to my datasocket server? I'm on the WALUG mailing list. Last month we had a DS discussion. Perhaps some of the URLs that came up could be of some use to you. We were mostly interested in what DS actually was: TCP or UDP. Turns out it's unbuffered TCP. (Sorry about the long URLs, you may have to paste them back together) Greg explains what DS is: http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=3CB758BF.809%40austin.rr.com&rnum=1&prev=/groups%3Fq%3Dlabview%2B%2522data%2Bsocket%2522%2Budp%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26selm%3D3CB758BF.809%2540austin.rr.com%26rnum%3D1 Discussion of DS benefits and application: http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=50650005002E110100-1042324653000%40exchange.ni.com&rnum=6&prev=/groups%3Fq%3Dlabview%2B%2522data%2Bsocket%2522%2Btcp%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26selm%3D50650005002E110100-1042324653000%2540exchange.ni.com%26rnum%3D6 Using DS through a firewall: http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/fcf8a1464bd2f6d686256b59007c9a6f?OpenDocument -Kevin
Re: OFF TOPIC:Test Chamber advice
Hi Dan, I haven't used one of Thermotron's chambers yet but I know of others that have. The website doesn't show the specs for the thermal shock chambers but it's worth checking out. I use a piece of junk Blue M and a 20+ yr old Ransco. What you're looking for is definitely top-shelf. Expect to pay big $$$. http://www.thermotron.com/ther.html Good luck, -Kevin
Opening and Reading
My problem is opening read-only files using the waveform file open vi. At the heart of this vi in the "Open file" primitive with mode input set to 1 (open). When I try to open the file, I get the following error "Error 8 occurred at a Open File in Myvi". To confirm my assumption Open file primitive was the source of the problem, I did a quick test trying to open a .txt file set to read-only and got the same error message. (The file are set to read-only because the file were burned to a CD and then transferred to another computer for analysis.) Obviously I am not first to discover this behaviour so I checked the Info-search without any luck. Is there a good way or utility to opening and reading this type of file while preserving its protective state. I running Windoze 2000 with LabVIEW 7.0 (Oh how I wish I could use my mac) Paul A. Rochefort Chalk River Laboratories AECL
ActiveX Events
How can I transfer data from an ActiveX Event Callback back to the main program? Regards SDC
SysTray icon
Where can I find an ActiveX Control to control a systray icon with labview? Thanks.
LabVIEW PDA for iPAQ HP 5550
Hi Is there someone who has experience wit LabVIEW for PDA with iPAQ HP 5550 (Windows 2000) My problem is that the emulator does not work I have already installed the update for PDA Any help Jürgen GKSS research center Jürgen Buhrz Max-Planck-Str. 1 21502 Geesthacht Germany Tel. +49 (0)4152 87 2708 FAX +49 (0)4152 87 2727 Mail [EMAIL PROTECTED]
RE: data comparison for custom indicator
Bret You need to work out which direction your motion system is going. One easy way is to create a while loop that reads the position periodically and loads the value into a shift register. The direction is determined by comparing latest measured position to the last value form the shift register. Feed comparison result to Boolean arrow indicator and voila. If you want to be fancy, use a separate conditional so that when the values are equal the indicator disappears (create a property node and write to the "visible" property). Be sure to put an appropriate delay in the measurement loop (say 100 to 250 ms) so you do not load down your system. Cheers Paul A. Rochefort AECL Chalk River Labs Ontario, Canada -Original Message- From: Brett Scott [mailto:[EMAIL PROTECTED] Sent: 25 February, 2004 4:13 AM To: Info-Labview Subject: data comparison for custom indicator Wireworkers How can I do a comparison in that, I have a machine witch travels up and down and the linear transducer sends this data position (displacement) to my application, I have a vi witch will accept a t/f and will flash arrow pointing down or up . I want to wire this up to the rest of my app so when the displacement increases it makes the arrow flash accordingly, Basically have done everything except the bit were I make a comparison and send the T/F ,to my little custom indicators. Any help or example code in V6 Base would be greatly appreciated.
Problems since upgrading to XP, License manager
Hi, Since my machine was forcibly upgraded to Window's XP strange problems have been occuring. Sometimes when I launch a vi that lives, not on my local machine but on the network it takes about 1-2 minutes for the vi to open. During that time if I use the Window's Task Manager it says that Labview is "Not Responding", if I wait it out the vi will eventually open. An IT person here informed me that XP does not keep network connections open for longer than a few minutes or something like that. A seperate problem, I was installing LV 6.1 onto my newly acquired desktop yesterday and the installation failed. Now there is a "nilm.exe Application Error" dialog box that will not go away. If I say "ok" another one appears, then another... Not sure who to contact about this. Any ideas? -- Jim Lewandowski Stanford Linear Accelerator Center [EMAIL PROTECTED] (650)926-4909
Indexing Event structures
Hi, I'm wondering if its possible to index the data in an event structure. I want to be able to click on a list of data and have each click write the data to an array. Right now I have the event structure inside a while loop, that is indexing, and it seems to work ok. It would be nice to eliminate the "while loop" from the process. Thanks, -- Jim Lewandowski Stanford Linear Accelerator Center [EMAIL PROTECTED] (650)926-4909
Reading file names from a directory
Hello, I'm trying to read all file names from a directory into an array and then choose the ones to process. The "List Directory" vi implies that it will do this but I'm not having much luck. The vi will produce a list of my available drives if I do not give it a path name. Any hints on making it work? Thanks, Jim -- Jim Lewandowski Stanford Linear Accelerator Center [EMAIL PROTECTED]
PC time
Hi, does anyone have a VI or DLL that can read PC (windows) time to millisecs? thanks. -- Timothy Wen Applied Physic Lab/U of W 1013 NE 40th St., Seattle, WA 98105 206-543-1300 (Voice)/543-6785 (Fax)
RE: LV Scripting Forum at LAVA?
Well, I just couldn't resist. Sounds exciting, here it is: http://forums.lavausergroup.org/index.php?showforum=29 Thank You Michael Aivaliotis http://forums.lavausergroup.org -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of PJ M Sent: Monday, March 22, 2004 10:57 PM To: Jim Kring; LABVIEW INFO Subject: Re: LV Scripting Forum at LAVA? Jim and all. >Perhaps a LAVA discussion forum could be created for >the purpose of investigating these newly discovered Scripting toys. That >way the Advanced LabVIEW user-community could help provide basic >tech-support and documentation. That sound like a great idea ! PJM Do you Yahoo!? Yahoo! Finance Tax Center - File online. File on time.
Re: LV Scripting Forum at LAVA?
Jim and all. >Perhaps a LAVA discussion forum could be created for>the purpose of investigating these newly discovered Scripting toys. That>way the Advanced LabVIEW user-community could help provide basic>tech-support and documentation. That sound like a great idea ! PJMDo you Yahoo!? Yahoo! Finance Tax Center - File online. File on time.
Time-Dependent Function
I need to create a triangle wave that will be time-dependent. In other words, if the time is between 00:00 (midnight) and 12:00 (noon) I want my function (temperature) to increase linearly from the minimum at 00:00 to the max at 12:00. Then, from 12:01 to 23:59 I want my function (again temp) to decrease linearly from max at 12:00 to min at 00:00. Ideally, whenever I initiate the program LV would know what time it is and determine the target value for temperature. IS THIS POSSIBLE IN LABVIEW??? Is there any way to convert those ridiculous seconds into meaningful time???
Re: Wrong solutions using Non
Olih, I see that your test Y data was derived exactly from the function you're "guessing" at here, so indeed your example should return the exact values that you expect for a0, a1, and a2. (it does for me when I run your test) The answer almost certainly lies in the "Target Fnc & Deriv NonLin" VI that is a subVI of the main Nonlinear Lev-Mar Fit. On the block diagram of that subVI, I would guess that you--or some other user--has entered a different function into the "Function f(x)" formula node than the default/shipping y=a0*exp(a1*x)+a2 function that you're expecting to be there. This is the heart of the fit, and if the functional relationship specified there is some other equation than the above, then LabVIEW is simply doing its best to return coefficients that provide the best match to the Y points in your test--horrible though that match may be. Now to get up on my soapbox: though powerful and useful, the Lev-Mar fit that ships with LabVIEW is very nonintuitive in that it's one of the only functions that requires you to modify _shipping_ code in the vi.lib folder before it is of any practical use. If this is part of your confusion, then I advise you to search for LabVIEW and Lev-Mar in the forums and elsewhere and examine other examples of the tool in action. One good solution (in my book) is to leave the shipping pair of Lev-Mar VIs alone and make copies to modify and use in your various curve-fitting exploits. If I'm wrong about the problem you're facing, then go ahead and follow up with more information. Best Regards, John Lum National Instruments
Re: Manipulating RS232 data into array of boolean
Actually there is one more thing, I would like to lable the array, but what I have read, and tried, if I change the label on one, they all change. Could I have done the previous manipulation of address and data using a cluster as the indicator, so that I could easily label the indicators? Thanks.
Re: Manipulating RS232 data into array of boolean
Thanks to both of you. That is exactly what I was after, now I can move on, hopefully I will not run into anymore problems, but if I do I will know were to come for help, thanks guys.
Re: Scanning an array.
See answer in the "Extracting numbers from a file" answer thread that Ajit asked previously. http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500080090C8&USEARCHCONTEXT_CATEGORY_0=_49_%24_6_&USEARCHCONTEXT_CATEGORY_S=0&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0 --John Lum National Instruments
LV Scripting Forum at LAVA?
That's pretty cool, David! The possibilities really makes the mind wander and wonder. I'd be interested in hearing about and seeing some examples of other neat utilities people have been able to put together using these "exposed privates". Perhaps a LAVA discussion forum could be created for the purpose of investigating these newly discovered Scripting toys. That way the Advanced LabVIEW user-community could help provide basic tech-support and documentation. Regards, -Jim Kring > -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of David Edwards > Sent: Monday, March 22, 2004 6:16 PM > To: [EMAIL PROTECTED] > Cc: [EMAIL PROTECTED] > Subject: Warnings & coercion dots (Was - All those things) > > > Stephen: > > LabVIEW now has the very nice warnings feature that is very good for > improving code reliability. Unfortunately, coercion dots do not show > up as warnings. > > Finding the "diagram" property in the code Norman pointed to, allowed > us to write a nice utility to scan a complete project for coercion > dots. > > David Edwards > FemtoTek, Inc. > > > Standard warning that anything "that we try to hide" > > a) may or may not be supported in the next version of LV > > b) probably has never been introduced to tech support so > they won't be > > able to help you c) may break (read: crash) if used outside of very > > specific context. > > > > Proceed on the theory that if you're using it, you're on > your own. We > > don't typically hide things that we think customers can actually > > safely use. > > > > Pojundery, > > Stephen R. Mercer > > -= LabVIEW R&D =- >
Re: flatten to xml from variant
Mathis, Refnums (especially VISA/DAQ/IVI refnums) are tricky. We'll work on it. I have generated a feature request. You can track progress here: http://sourceforge.net/tracker/index.php?func=detail&aid=921506&group_id=52435&atid=466835 Cheers, -Jim
Re: Need help duplicating rows of 2D boolean array
ARRGGGH!!! When I tried to open the first VI you posted, it couldn't b/c it said that version 7 is newer than version 6.i. Now it won't open the 6.1 VI b/c it says that 6.1 is newer than version 6.0!!! So apparently I guess I need a version 6.0 VI??? I'm really sorry for the trouble! If you have time to post a 6.0 version, great, if not, I understand! Thanks! (and I hope I can repay the favor one day!!!)
Let's have election
As there is to be a handover of the list management, I believe that this could also be a good time to upgrade the software so that we can have a "running no" for the list - in this manner we can tell immediately if we are missing any of the list, as sometimes they appear not to come through (probably due to servers being down for example). Thank you Bill
FPGA extended memory initialization
I've been given someone else's FPGA vi. It contains a 32x16K memory block sub vi and returns error code 6 when I try to compile it. I've downloaded the extended memory files from ni, but I don't know what I need to run to initialize this memory block. Do I need to create the block from scratch or can I use the memory block vi that they have sent me?
How to use a USB-to-parallel adapter to communicate with my switch device?
My computer doesn't have a parallel port, so I must use the USB port and a USB-to-parallel adapter to communicate with my switch device. Unfortunately in WindowsXP printer configure that show USB001 Virtual printer for USB. How should I control my USB-to-Parallel converter to send the Pin1 and Pin3 high? How should I decide that I/O address in Labview (traditional LPT1 is 378AH) ?
RE: Make current values defaults
As you found out, you can't save the default values in run mode, because that's an edit operation. You would be changing the way the VI is stored on disk. Even if it were possible, you might not want to store user values as part of your source code. Whether or not you are not using formal source code control, it's useful to know when a VI has changed, so it's better to store user data somewhere else. There are some excellent (and free!) OpenG Tools for saving configuration items like this. http://openg.org Jason Dunham SF Industrial Software, Inc. -Original Message- From: Yang Yang [mailto:[EMAIL PROTECTED] Sent: Monday, March 22, 2004 5:07 PM To: [EMAIL PROTECTED] Subject: Make current values defaults Dear List, How to use VI's "Make Current Values Defaults" method inside of program? I just want to call and open a subVI, let the user modify some control values, and when the subVI closes, set the control changes to default values. I think the process is in run mode. "Make current values defaults" only works in edit mode? So how to do it? Thanks yang
RE: The Future of Igor and Info-LabVIEW Lists
Well, I would like to thank YOU Tom for setting up the info-lv in the first place. I know it was a valuable resource for many first-time LV users (like myself) way back when there was nothing else out there. I'm glad the decision has been made and now we can all move on to talking about the usual. Take care Tom and again, Thank You. Michael Aivaliotis http://forums.lavausergroup.org > Good afternoon, all. As you know, there have been a number of > problems which have impacted the availability of the Igor and > Info-LabVIEW mailing lists recently. I've asked the readers > of both lists for their support in moving those lists to > another server and in taking over the administrative tasks > I've been performing. > > As I fully expected, given the fine caliber of folks who use > Igor and LabVIEW, a number of folks threw their hats in the > ring. I'd like to start by publicly thanking Michael > Aivaliotis, Scott Hannahs, George Gatling and Arlen Walker > for doing so. I'm quite sure that all of them are fully > capable of taking on the job and making sure that it will all > happen. I have asked Scott Hannahs to take the reins... > > As I slowly fade from the scene, I'd also like to thank all > of you for making this a really great experience. Way back > when I was a heavy Igor and LabVIEW user, the lists made a > tremendous impact on my ability to do my work here. Time has > marched on and I do different things now, but the value of > user communities like these is clear and real. You all can > give yourselves a big pat on the back for making that happen! > > Take care... > > Tom Coradeschi > Excalibur Systems Engineering > [EMAIL PROTECTED]
Re: how to send data as a stream to web site
you are correct i was refering to labSQL. I need to better understand how how to write the labview to connect. i use mysql alot and the terms used from the labview side are not always the same or are better known by a different term. ie. DSN for one I have the latest odbc drivers including myodbc3(mysql) I know SQL. beyond this i'm lost at the moment. I am used to logging on to the db from linux. if you had an example of how to connect to a db other than a micrsoft one that may guide me better or a location of a how to.
Re: Anybody using Zetron 1730/1732's using LabView 7
Thanks.. kinda have gotten the feeling that Looout was the software of Choice!! But, as this got dumped on my lap 2 years after we bought the software, I'm trying to figure out a way to make this work, and soemwhat easily for myself. I'll continue to look at the OPC item in Lookout and see if I can figure it out!! Thanks for your help!! Rod
Re: Urgent! Web browser ActiveX control size messed up.
inhaler, I still wasn't able to reproduce your situation regarding ActiveX containers displaying with the wrong size. However, the problem has been reported and is beening investigated. In the meantime it seems as though this problem does not exsits when using LabVIEW 6.0 or 6.1. This might not be a viable option for you but I thought I'd relay the information. I will continue to attempt to replicate the problem and update this thread if I can find anything. Regards, Shea C Applications Engineering
Re: Anybody using Zetron 1730/1732's using LabView 7
Hello Rod, As you may have found out, the Zetron controllers use Modbus protocol for communication. Your objective will be to establish a communication between LabVIEW and the Zetron controllers using this Modbus protocol. There are several options for this: 1. The recommended solution is to use the Modbus Server from the Lookout Protocol Drivers (LPD; which are nothing but OPC Servers) with LabVIEW-DSC (which has a built-in OPC Client). 2. You can also use DataSocket from within LabVIEW (instead of LabVIEW-DSC) as an Client. Again with LPD serving as the Modbus OPC Server. 3. Implement the Modbus protocol yourself in LabVIEW. This will not be easy, but is doable. People have done this. You may search the NET for some Modbus VIs. I hope this gives you a big picture of what needs to be done. Write back if you have questions. Regards, Khalid
Re: RPC + LabView
Hi, >From what you're saying, I understand that you'd like to use RPC calls in LabVIEW to communicate with a VXI-11.2 compliant instrument via an ethernet connection. If you're interested in doing such ethernet communication, then you can install the appropriate VXI driver and use LabVIEW VISA VI's to communicate with the device. VXI drivers can be downloaded from www.ni.com/drivers, and information about VISA communication is available at the following url: http://zone.ni.com/devzone/conceptd.nsf/webmain/790B808B320DCF6F86256BE2006965E6?opendocument If this information doesn't answer your question, then please clarify the issue and I will try to resolve the matter. Thanks for contacting NI! Marcus G. National Instruments
Re: How do I access existing visual basic modules (.bas) files in LabView
I'm not sure why you want to access the .bas files. There is no way to convert basic source code to LabVIEW. Some things like declarations, memory allocation, are not required in LabVIEW or are done for you by the LabVIEW compiler. Constants, local and global variables, user defined types in the form of custom controls, all exist in LabVIEW but in general, are much easier to use. Maybe if you post a snippet of VB code, someone can translate it into LabVIEW.
Re: Fw: [W] Sentinel SupePro Automatic Protection
> - Original Message - > From: "Reed, Christopher" > <[EMAIL PROTECTED]> > To: "LabVIEW Mailing List (E-mail)" > <[EMAIL PROTECTED]> > Sent: Monday, March 22, 2004 1:41 AM > Subject: [W] Sentinel SupePro Automatic Protection > > > Dear List, > A while back there was some talk about using LabVIEW > drivers > for Integrated Protection with the Sentinel Security > Key from > Rainbow Technologies. > > But has anyone managed to use Automatic Protection > (ie. wraps > a security shell around the LabVIEW executable) on a > LabVIEW > program? > > Everytime I try to run a "protected" LabVIEW > application it just > displays the message. > "This is the application template and cannot be run > alone" > > Technical support from Rainbow are a bit baffled > with this since > they have not heard of a programming language called > LabVIEW > and so are not really sure what the problem is. I read this text from the "Developer's Guide" "If you are shelling an application and you try to encrypt a .DLL which is a dependency of the application you are shelling, the .DLL will not be decrypted at runtime because the operating system tries to load the .DLL before the shell has a chance to decrypt it." So I guess maybe at runtime, LabVIEW try to load the application before it's decrypted. Irene = Irene He Yahoo Messenger ID: [EMAIL PROTECTED] www.geocities.com/irene_he www.hytekautomation.com
Re: Analog Output buffer delay
Hello, I=92m certain of what you mean when you say that =93the waveforms in output have a delay equal to output buffer length=94. Do you mean that the output waveform values should be changed and the buffer size should stay the same size? Or do you want to add new waveform data to the end of the waveform you created with the Initialize Array VI? Thanks, Ken S. National Instruments
Re: I am getting time lag between NI 4452 and NI 6602
Daniel, What you are seeing is expected and you were almost exactly right with your formula. The DSA boards use a digital filter to remove frequency components above Nyquist. This introduces what we call Filter Signal Delay. This spec for the 4452 is 42 samples, so the formula is actually: (time lag)=42/(sampling rate) The good news is that you can always expect this when you are using digital triggering, so you should be able to account for it since it is essentially a constant. Just use the formula you figured out to adjust the time stamp in software and you should be all set. Let me know if the work around is not so simple in your case and we can think about other solutions. Best Regards, Jeremy R. NI - Applications Engineer
How do I access existing visual basic modules (.bas) files in LabView
First post here so be nice. For several years I've used Visual Basic as the test platform for production tests. In addition to the form code there are typically several modules (.bas files) associated with a given project. I'm attempting to prove to management that LabView is a better long term solution for production test and VART test. I'm new to LabView and am trying to get up to speed quickly. One thing I haven't figured out is how to access the .bas files from LabView. There are several user defined types, public functions, constants, declarations, etc that I don't think can be done in the graphical environment. I would really appreciate your feedback. thanks, todd
Has anybody built a BERTS generator and detector over a network?
I'm using LabView 7.0 and I was wondering if anybody had developed a BERT's generator and Detector using LabView 7.0. I will be using it over a TCP/IP network.
Re: how to send data as a stream to web site
Okay, then from one of your other answers, I understand that you don't have the database connectivity toolkit and are having problems with a free version. Is this LabSQL that you're trying? If so, what are help do you need? Have you defined a DSN for connecting to the db? Do you need help with the SQL statements? Do you have the latest version of Microsoft's Data Access Components?
Controlling Second Computer Keyboard using LabVIEW
Is it possible for my computer with LabVIEW installed on it to control a different computer booted only from a floppy (the floppy contains programs written in FOURTH used to test hard disk drives therefore the second computer has no operating system) The hard disk drive being tested is connected to the IDE 1 connector of the floppy booted second computer. Currently, the operator has to enter the FOURTH commands via the second computer's keyboard.
Can I create an ActiveX DLL from Labview?
I am new to ActiveX, and have only found examples related to activeX servers for Labview exe's. I would like to create the equivelent to an Visual Basic ActiveX DLL. Is this possible?
Re: Repeatedly Launching Reentrant Front Panel
Would you happen to have or know where i can find any examples of this would you?
Re: I am getting time lag between NI 4452 and NI 6602
Hello Daniel, I have a couple of questions regarding this problem. 1) What kind of signal are you using to trigger the counter and the analog signal (Is this the pulse train that you referred to?) 2) Do you have the DSA device set as the master? The DSA device must be set as the master for the triggering to function properly because it cannot accept external sample clocks. 3) How are you connecting the RTSI signal in software? Are you using DAQmx or Traditional DAQ? What version of NI-DAQ are you using? NI-DAQ is up to version 7.1 now, and DAQmx has built-in functionality for using RTSI cables to synchronize two devices. 4) How are you obtaining the timestamp for your counter? What are you using as your timebase (t0)? If the t0 value is somehow inaccurate, then that would throw off the time measurements by a constant value. If you could give this information, it would help to provide a reference for solving the problem. Scott Romine National Instruments
A baffling File delete problem under LV 6.1
Well, folks, I'm stumped. This bug defies all logic and any attempt to kill it. Here's the scenario: Setup.vi launches Acquire.vi dynamically. Acquire.vi creates the file Temp.dat which is used to store data until it can be safely written to the final data file (time consuming scans are occurring and if the computer crashes for whatever reason, Temp.dat is used to recover what was already acquired and to continue scanning from there). Acquire.vi creates Temp.dat using the New File function (with Overwrite = True) and stores the reference in a cluster which is accessed to write to the file and then close it and delete it at the end of the acquisition. Because the reference is in a cluster and because I always use Unbundle by Name, I was able to change the name of the reference in the cluster to find every instance of it (thus verifying that Temp.dat wasn't being opened more than once). However, no matter what I do, after I Close the reference (which returns with no error), I cannot delete the file (error 8). Acquire.vi exits (unloading it from memory). If Setup.vi is still running, I also cannot delete the file from Windows Explorer. Once I exit Setup.vi (with LabVIEW still running, but Setup.vi loaded but not running), I CAN delete Temp.dat in Explorer. All of this is in LabVIEW 6.1. Now here's the kicker: the same code loaded into LabVIEW 7.0 DOES manage to delete Temp.dat without any problem. I cannot understand how this can be. Even if I didn't close the reference, once Acquire.vi stops running and is no longer in memory, I should be able to delete the file in Explorer (I confirmed this by creating a small VI which creates a temp file- as long as the VI is running I can't delete the file- once the VI stops running, I can delete it even if I don't close the reference to the file in the VI). Furthermore, Setup.vi only accesses Temp.dat once- when it starts up it looks to see if Temp.dat exists (if it does, it reads from it, stores it in a real data file and deletes it). How is it possible that Temp.dat cannot be deleted while Setup.vi is running when Setup.vi has no reference to Temp.dat? None of this makes any sense. If anyone has ANY idea why this might be (setting permissions didn't seem to help), I would be most grateful. One last comment: Acquire.vi also creates a file called TempHdr.dat (which holds a temporary copy of the data's header- it is located in the same directory as Temp.dat). However, this file is created and closed immediately and is deleted successfully (in LabVIEW 6.1) before Acquire.vi exits. Other than having Temp.dat's reference open all the time and written to at the end of each scan, there's no difference between how the files are created, closed and deleted. If you've made it this far, I'm impressed. If you have ANY idea what's going on, I will be eternally grateful... -E. Blasberg iDAQ Solutions Ltd.
Re: Simulate serial signals in LabVIEW 7.1?
Thanks all for the pointers! - CB Conseils <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > If you have a P.C with two serial ports or an old P.C. > > 1) Write a Labview application to 'simulate' the external device. > > or > > 2) Use the Terminal Program and load a text file. > > 1 has the advantage of ensuring that you understand the protocol > before implementing. > > For a project I worked on I did this and then made the simulation > program available for others.
Re: Repeatedly Launching Reentrant Front Panel
Sure, it is possible assuming that there is no shared resource between them cannot be accessed concurrently.
Re: How disable and groyed the bottom until i want appear it!
Thank you dennis for the fast reply. Simply perfect!. regards.
Re: how to send data as a stream to web site
On the other server is a web page that will read a mysql db and post the last 10 readings
Re: Can I search and remove a specific string/text from a queue as you would from an array?
You could use the get queue status to return the array of elements in the queue then search the array then if found remove the elements you wish to remove. The flush queue could be used to remove all items from the queue then index the new array of information back into the queue. The flush queue could be used in place of the get queue status if you plan to remove an element each call. Unless you are set on using the queue method another choice may be to create your own version. You could write a vi that includes a state machine allowing you to handle all your array manipulations based on the call to the vi. Various states could be insert, search, remove, sort. Use a shift register on a while loop to hold the array and an enumerated control to signal the state to execute. Use a string control and indicator to pass information in and out of the vi. I hope this helps. Randall
Re: Implace Array Functions
Thanks John, It is ok. This was kind of a shot in the dark. I know that there has been lots of questions about this concept in classes and on the developer zone. I just wanted to help students understand and contribute to the LV community the best I can. I do agree that the posting is probably an internal KB entry. If you can find any info I would appreciate it. Thanks. Brandon Dineff Certified LV Developer/Instructor www.dsautomation.com
Re: Alternative info-LabVIEW list
Jean Pierre et all, > I don't mean a public USENET newsgroup but maybe a private news server accessible > only to the list subscribers. I like that idea. PJM Do you Yahoo!? Yahoo! Finance Tax Center - File online. File on time.
Re: All those things - UPDATED
Standard warning that anything "that we try to hide" a) may or may not be supported in the next version of LV b) probably has never been introduced to tech support so they won't be able to help you c) may break (read: crash) if used outside of very specific context. Proceed on the theory that if you're using it, you're on your own. We don't typically hide things that we think customers can actually safely use. Pojundery, Stephen R. Mercer -= LabVIEW R&D =- |-+> | | "Norman Kirchner"| | | <[EMAIL PROTECTED]| | | m> | | | Sent by: | | | <[EMAIL PROTECTED]| | | a.army.mil> | | || | || | | 03/22/2004 02:23 | | | PM | |-+> >--| | | | To: <[EMAIL PROTECTED]> | | cc: | | Subject: All those things - UPDATED | >--| I found the specific unprotected files in the LV70 Dir C:\Program Files\National Instruments\MAX\Assistants\LVCGen\LV70\ Looks like someone forgot to protect the clusters mxwScript_CleanUpWires.vi mxwScript_ClusterConnector.vi
Re: Alternative info-LabVIEW list
> >I would like to see Info-LabVIEW on a news (NNTP) server. > > I sure hope this doesn't happen... I have tried and tried to get our IT guys > to open up NNTP for me. They simply won't do it... I am sure there are many > others in the same situation > Scott, Would it be possible for the mailing list to be mirrored on a news server? This way one could browse messages by threads with one's favorite news client. I remember having read somewhere that some company (is it NI?) does that internally to distribute the Info-LabVIEW mailinig list. I don't mean a public USENET newsgroup but maybe a private news server accessible only to the list subscribers. Jean-Pierre Drolet Avensys
Can you have nested event loops?
Can I design my program to have nested event loops?
Re: LV crashes while loading my llb, but the built app. functions correctly???
Hello, As I understand it you=92ve basically got several subVIs which cause Labview to crash (on two different PCs) when they load, regardless of whether these subVIs are in an llb, etc. The only exception to this is when you build an application using these VIs or you use your splash screen program to load them into memory. One thing to try to fix this would be to do a Mass Compile on the llb which contains these VIs. To do this, open a blank VI in Labview (you don=92t have to open the llb to do this), and from the menu choose =93Tools->Advanced->Mass Compile=85=94. It will then prompt you for the location of the llb file. After choosing the llb file hit the =93Mass Compile=94 button. If this doesn=92t fix the subVIs, could you post one of the offending subVIs so that I could see if I can repeat the issue you=92re seeing? Thanks, Ken S. National Instruments
Can I search and remove a specific string/text from a queue as you would from an array?
I need to enter text into an array in a specific order, so queues are great for this, but I also need to remove specific text from the array (that may be in the middle of the list or anywhere)thus I need a search and remove for specific strings. Please help...
