How can I display a TTL-Signal immpressed at a parallel port?

I get a real TTL-Signal from a resolver which is connected at the parallel port. From this parallel port I would like to read the frequency of the signal coming in. The resolver is connected at the parallel port at only one data pin and at a ground pin, without using a DAQ. (In past I used the InPo

Re: Selling Useful routines

John, you asked on Mon, 14 Jun 2004 14:52:32 -0400: I have ... set of VI's to manage configuration files and parameter data as functional globals. > ... I'd like to get some feeling for the most suitable way to earn some money this way. Selling routines without diagrams seems a chancy business fo

"Insert Teletext"

Hi all, I am sending this mail again as I did not receive any response for my previous posting. I have an application wherein I have to insert teletext or video images during the vertical blanking interval of the composite video signal. I am looking at NI 5431 Video signal generator card which ca

Re: "Insert Teletext"

- Original Message - From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, June 15, 2004 8:59 AM Subject: "Insert Teletext" > Hi all, > > I am sending this mail again as I did not receive any response for my > previous posting. If you don't get a reply, it generally means no

Can I resize function icons on the diagram ?

I want to publish a diagram on a journal. Unfortunately function icons (like the sum operateur) are too small. After printing it is thus not possible to read correctly the diagram. Is it possible , like for objects on the front-panel, to resize objects on the diagram (line connexions and operators)

While loop in subVI

Hello I have a doubt about using while loops in VI and subVI. I have a VI, with two loop that are executed in parallel, and stoped with the same button, by using property nodes and references. One of the while loop executes a subVI. If the Block Diagram of the subvi there is a while loop covering a

HSB <---> RGB in LabVIEW ?

Hallo, I'm looking for some vonversion VIs or function to convert RGB color values into HSB color values and vice versa. Can LabVIEW do this by default or does anyone know if anybody has written anywhere in the world something like a "Color toolbox". I'm running LV7 Express Thank you Oliver

Re: DDE in loop

Hi LV Newbie, The answer that the other user posted on the forum is what you need. I have access to a copy of Labview 5.0 and I'll try to convert his code to 5.0 for you. Chris M National Instruments (UK)

search special character

How to search for special characters (peculiars) in the developer exchange, e.g. "[" "]" or whole phrases like "controls[]" Stefan Pofahl

Re: How can I display a TTL-Signal immpressed at a parallel port?

You also can use the serial read function or VISA read function to read the parallel port. But before you have to set a porrt no. for your LPT in the labview.ini to access to the LPT. This is documentated somewhere on ni.com. wimmer franz wrote: > I get a real TTL-Signal from a resolver which

Re: problem with 2 COM ports working parallel

It is not so easy, because the applcication is realy complex, so I have to reduce it a lot. But I can tell you so far, that the the write commands to the two COM ports happens nearly at the same time. Maybe windows does not like this. So I will change the timing. Unfortunatly I does not have the

Fw: Ramp meter.

- Original Message - From: "Daniel Alejandro Moyano" <[EMAIL PROTECTED]> To: "Info LabVIEW Mailing List" <[EMAIL PROTECTED]> Sent: Thursday, June 10, 2004 7:49 PM Subject: Ramp meter. > Hello very nice people: >In a virtual instrument, I have choosed

Re: arithmetic average with LabVIEW 6.1

The easiest ways are always the best !! Thanks for helping me.

Re: running under fedora 2 kernel 2.6

Dear LouisP, Thanks for your help. I've upgraded to Labview 7.1 but I still get the same problem. Labview crashes with error message: LabVIEW caught fatal signal 7.1 - Received SIGSEGV Reason: address not mapped to object Attempt to reference address: 0x27ebe4f4 Segmentation fault

Re: If i use a sub-vi 3 times simultaneously in my main program....

if i make my sub vi's as reentrant, do I lose any process speed, in other words are there any limitation for using the reentrant execution? and thanks for your reply.

Re: 2d cross-correlation (for image correlation): some questions

Hi Michael: Thanks for looking at this for me. The other issue is that when I use the IMAQ VISION cross-correlation fx (which allows me to do direct image correlations without having to do the fft steps), I get different answers than what I get with my LabVIEW routines. I believe that most of th

Re: Fw: Keystrokes

Nuno asked: ... any help on sending keystrokes to other application? I'm attaching (private email only) my collection of snippets from this forum about capturing and forwarding keystrokes. -- Paul F. Sullivan SULLutions

Re: Reusable Code

how about using the subpanel feature? create 20 subpanel vis for your setups an splash them on your screen?

Re: How do I create an emergency stop custom control in LabVIEW that looks like an actual E-stop button

Thank you very much

Re: How do I create an emergency stop custom control in LabVIEW that looks like an actual E-stop button

The Application Note on Custom Controls is most helpful - thank you also.

Re: Reusable Code

And yet another idea Use a tab control or a set of tab controls. You can drive a single tab control with 20 tabs for 20 views, or use 20 single page tab controls. Ben

Re: If i use a sub-vi 3 times simultaneously in my main program....

My "NO" was to Mudda Q. I am the same page as Ed. Ben

Re: If i use a sub-vi 3 times simultaneously in my main program....

If the subvi does not contain data that are dependent on a previous run , such as local variable or shift register data, then there is no need to make the vi reentrant.

Re: Important question: I have got a PXI-4472 and I am able to...

First: yes, the operation is correct. Second: yes again. When you consider a multi-channel acquisition, your sampling rate must be shared among the channels. Third: when you specify a list of channels you want to acquire from, the channel considered for analog triggering is the first you put in the

Re: Can I resize function icons on the diagram ?

Hello, You can modify the view of functions in diagram by right-clicking then selecting "view as icon". Nevertheless,this option is only available for VI express and standard functions. Standard functions are functions which have this own diagram and front-panel. You cant expand simple arithmetic

Re: If i use a sub-vi 3 times simultaneously in my main program....

No! You may pick some up. What you will loose is debugging. The main "gotcha" is the seperate memory space issue mentioned earlier. This means that if your sub-VI's use local storage (like shift register that store results from the last call for use in the next) are distict for each occurence o

Re: If i use a sub-vi 3 times simultaneously in my main program....

As far as I know, making a subvi reentrant would have no performance difference over having multiple VIs with different names. Maybe an app eng could verify this. Each time a reentrant VI is called from a new location in the code, it creates a separate area for it in LabVIEWs dataspace, the same a

Re: error using coupling property for analog input in LabVIEW DAQ

You get the unsupported error because the daq card you're using does not support AC coupling. It is DC coupling only.

Re: Case Statements

Thanks for clearing up my mistake. Kura Altenbach is correct. After reading your question again I realize I was wrong. sorry for that, thanks again altenbach.

Re: If i use a sub-vi 3 times simultaneously in my main program....

If the sub-VI is CPU intensive, and you do not want one call of the sub-VI to delay another call to the sub-VI Then re-entrancy is very useful. Ben

Re: How do I fit a curve with two independant variables

The model equation (where x is a function of C and of T) is as follows: x=K1+K2/(C+K5*T*C)+K3/(C^2+C^2*K5*T+C^2*K5^2*T^2)+K4/(C^3+2*C^3*K5*T+2*C^3*K5^2*T^2+C^3*K5^3*T^3) The example that you kindly provided would not open due to an error message stating that I needed LabVIEW 7.1: I am running the

Re: Can I resize function icons on the diagram ?

> I want to publish a diagram on a journal. > Unfortunately function icons (like the sum operateur) are too small. > After printing it is thus not possible to read correctly the diagram. > Is it possible , like for objects on the front-panel, to resize > objects on > the diagram (line connexions an

Re: While loop in subVI

> If the Block Diagram of the subvi there is a while loop covering all > the code, it's the same to put it in the main VI with another while > loop, or it's not necessary? > it's the same if this subVI has a while loop covering itself that if > the subvi doesn't have this while loop because the loo

Re: Insert teletext

Bipin, You need to look at what you want to do in more detail I think. First off I do not think the NI 5431 will be able to take the .trp files in a MPEG-2 format and generate composite video test patterns. You will have to convert the files to the format needed by the 5431. Second to insert te

Re: Fw: Ramp meter.

Although it isn't as convenient as having the feature built in, you can paste any graphic you want into LV's ramp control. Simply design the color ramp you want in your favorite graphics program, save it to a file (.gif, .png, .jpg, .bmp) then use "Edit >> Import Image from File" to put that im

Re: If i use a sub-vi 3 times simultaneously in my main program....

In principle, Yes, However, how much true that is depends on how LabView (R/D)developers are implementing it, and things have been changing between LabView versions, to different degrees, all the time.

Re: I have a problem using COM

Hi Chris As promised I have done some further investigation. If I remove the vi that registers all the events and associates the callback vi's with an event then the app closes down ok. It looks as though the callback vi's themselves are not closing down.

Re: search special character

> How to search for special characters (peculiars) > in the developer exchange, e.g. "[" "]" > or whole phrases like "controls[]" Some of the search functions do not use regular expressions or wildcarding and you can simply search for the phrase. If you are using match pattern, which does use r

Re: If i use a sub-vi 3 times simultaneously in my main program....

Yes sir! >From what I have read about LV 7.X and hyperthreading, two of these re-entrant sub-VI's can be executing simultaneously without having to resort to dual-proccessors. Ben

Re: Returning an array of strings to LV from activex.

> I have an ATL project on the go which returns an array of strings to > labview, which is working fine, with no problems, exept I cant 'probe' > the returned VARIANT data for some reason, so me thinks its the wrong > variant type!, but it works :) > > Is it a "variant containing a safearray of ty

Re: I have a problem using COM

Hi Stephen, Thank ypu for the extra files and information. I've been investigating your code further and I understand from your comments that the problem lies in the 'InletKernel_RegisterAllEvents2.vi', is this correct? However I still need the .dll, executable or control wh

How can I control PIC programmer with LabVIEW

I need to control a PIC Programmer (MPLAB PM3) with LabVIEW. How to do this?

Re: Creating an exe with 6.1 and VISA

Hello, NI-SPY is installed with NI-488.2, NI-CAN, and NI-VISA. There is however a known issue where if you install NI-VISA 3.1, the first time you run the installer NI-SPY doesn't get installed, but if you run the installer again it will install NI-SPY. Hope this helps! Regards, Steven B. Appli

Re: I need to read an unsolicited serial variable string.

Thank you for the response. I have the capability to reprogram my serial device to output any format. What format would be preferable from a LabVIEW point of view?

Re: switch 1127

What is the problem with niswitch_32.dll?

Re: Can't use the Measurement & Automation Explorer in the dl eval version

Can I download an evaluation version of MAX? I'm trying to setup an application to read measurements from a Micrometer and show them on display and save to disk. I really need to setup a working example so I can convince my company to buy the software.

close datasocket connection

Hello It's the first time I use DataSocket, and DataSocket server. I have developed an application, using the examples "DS Writer" and "DS writer" as a base. In my application one of the subVI has a while loop, and is subscribed to a DataSocket variable. When I stop this subVI from the Main VI, wh

Re: How can I control PIC programmer with LabVIEW

Check the following link: http://www.calbay.com/ProgramIC%20Data%20Sheet.pdf This toolkit might support the PIC Microcontroller. Robert

Re: If i use a sub-vi 3 times simultaneously in my main program....

Thanks to all of you for your comments, Mudda.

Re: I need to read an unsolicited serial variable string.

Thank you for your assistance. You have been very helpful. Cheers!

Error opening file:"The file XXX.vi is not a VI. Select Another?" Whats wrong?

When I try to open a .vi file that someone else made on my computer, I get the message from LabVIEW: "The file *.vi is not a VI. Select another?" What does this message mean, and how can I open these files? I am running LabVIEW 6i on Windows 2000 Professional inside an office network. Thank yo

Re: how to control the subvi front panel

Hey Fred, There are two different VI Server properties that I think may be useful to you. If you haven't used VI Server before here's a link to some general information on it. http://zone.ni.com/devzone/learningcenter.nsf/03f7c60f17aad210862567a90054a26c/371c4fea97121ea686256c4e0062de8a?OpenDocum

Re: I need to read an unsolicited serial variable string.

Baud, stop bits etc. is purely personal preference. LAbVIEW can read in basically any format, but I have a personal preference for tab seperators between values and newline/carriage return as a termination. This way the text can be streamed to a text file and is readable afterwards in Excel usw..

Re: Passing data from subvi's several levles down to top level vi

Is 100 msec too slow? I have loops that update the indicators this fast.

Re: Reusable Code

Err.. alright, but how do I get all of the property nodes into a subvi?

API's & drivers

Hello. I'm already a bit confused when reading about drivers and APIs... What's the difference between an API and a driver???(because sometimes texts refers to some of them without distinction). Once known the difference, which is which? NI-DAQ is a... driver or API??? And this for NI-DAQ, NI-DAQ

create an application with Labview 7 express

how to create an application which can run without the motor of Labview. I have the developper toolkit and application with I can build run also with the motor of labview on the computer Is it possible to crreate an application which can run without this motor?

Re: Creating an exe with 6.1 and VISA

I can't run VISA 3.1 because the target system is W98. I installed VISA 3.0.1 run-time. Is NI-Spy included in the run-time? It doesn't appear on the start menu or in the add/remove programs panel. -Jim

Re: application builder is missing in labview under tools

Hey Paul, DD is correct the full system does not include the application builder. Refer to the following link for a comparison of what the different versions include. http://www.ni.com/labview/how_to_buy.htm#compare>Compare Development Systems If you have questions on the different versions or wa

Re: close datasocket connection

Do you close the DataSocket connection using the DataSocket Close function and by passing it the connection ID? If not, do this outside the While Loop. Regards, Khalid

Creating reference of a subpanel to pass to a subvi

It does not appear to be possible to creat a reference to a subpanel (to pass to a subvi). Can someone confirm this? Can a subvi in anyway access the subpanel of another vi? This will make my code much more object oriented. Does anyone else feel this is a desired feature? Thanks. Zuolan

Re: While loop in subVI

Hello, I hope I understood you correctly... In general, it's better to use sub VIs to organize and modularize your code. So, if you can separate part of the code into a sub VI, do it. And if your main VI is calling the sub VI in a loop, the sub VI executes every iteration of the loop. So, you

Re: Error opening file:"The file XXX.vi is not a VI. Select Another?" Whats wrong?

Anyone can take any file and rename the extension to *.vi. This still does not make it a VI, right? You need to ask the author of the files what they are. There is no other way. Have you tried opening them in notepad to get some clues? (a true VI file typically starts with a few upper case charact

Re: Writing data from a multicolum list box to .lvm file

Hey Todd, The Write LabVIEW measurement file express VI is built on top of other LabVIEW VIs for writing to file. If you open the help for the Express VI it lists the VIs and functions the Express VI utilizes. If the data you want to write does not work with the Express VI you can always use the

Re: Subpanel.vi

Phil, The help file suggests that the main vi has to be running to prevent the subvi from being removed. You can add a pause at the end of the program so that it can be viewed. Or it might be possible (I don't know how) that you grab a picture of the front panel of the subvi and overlay it in front

Re: OPC et Drive Server OPC

Bonjour, Les VIs dits de compatibilit=E9 se trouvent au chemin suivant: C:\Program Files\National Instruments\LabVIEW 7.0\vi.lib\platform\dataskt.llb Vous trouverez =E9galement des exemples standards de programmation OPC/DataSocket dans LabVIEW: Menu Aide >> Recherche d'exemples... Cat=E9gorie "N

Re: How do I determine the fastest data acquisition speed (Hz) a user can select in program?

Hello! The main factor that determines how fast you can acquire is the type of data acquisition board that you have. In the user=92s manual of your board, under the specifications section, the maximum sample rate is listed and you cannot go any faster than that. Once you have written your data ac

Re: create an application with Labview 7 express

Every built LabVIEW application requires the run-time engine installed. Just like the on-line help states. Much older versions of LabVIEW included the run-time engine in the executable which resulted in large exe files. Now, the exe's are smaller but the engine is still required. A separate engine

processing of aquired signal during aquisition (arrays?)

Hello, I'm aquiring a voltage signal from a thermistor using DAQ and Labview. I'm using "for-loop" in Labview for that. Is it possible to take my previous readings of the voltage signal (through A/D channel), say, V(i-1), compare it to its current value V(i) and if a comparison condition holds - "f

VI Server error 63

Hi I have two remote systems which are supposed to remain connected with VI Server. Sometimes, when one computer starts LabVIEW and tries to connect, it gets error 63, connection refused by server. Since the systems are remote, I'm having a hard time figuring out exactly what causes the proble

How can I easily step through Matrix Combinations in Labview 7.1?

I have a 2D matrix of test parameters that I'd like to step through, hitting all possible combinations. I'd like the system to be dynamic so that I can input a matrix of any size. The obvious solution is to use nested for loops, but I don't think that will allow me to handle dynamic matrix sizing

Re: How do I fit a curve with two independant variables

Your code is awesome. I have taken a number of informal cracks at making a 2d lev mar function and have given up. I also want to complement you on your nice UI in the toplevel VI. It is clean and intuitive (plus it has directions if it is not so intutive for someone). Great Example!

RE: VI Server error 63

Just a thought but if this is starting Labview after a Boot, perhaps it is starting Labview before the network services are completely up and running. In other words maybe this is not truly a server issue, maybe its all within the remote box. Just a thought... Rick M LMC Syracuse NY -Origin

I need some documentation of wire data types

I am new to LabVIEW and I am having trouble finding some information. Specifically I would like to know what the different wire data types correspond to on the block diagram. For example the thick pink wire is for errors, etc. The manual says to look at the Quick Reference Card for this informati

How to use Digital output to turn on sensor for Analog Input?

I am trying to use a digital output to turn on an array of sensors that I then wish to read on 16 analog input lines. I have a 6024E DAQ card. I am planning to take data at 10-20 hz, so not terribly fast, but I will be acquiring for long periods of time (days) so I will be streaming data to disk.

Re: I need some documentation of wire data types

The color of the wires is the same as the Terminal Data Types that's on the quick reference card. Clusters such as the error control are a mix of data types and are represented by the thick pinkish, sort of dashed wire. Clusters of numeric data type are brown and dashed. Arrays are thicker and of t

Re: I need some documentation of wire data types

And while you are playing around, switch to the wiring tool with the help window (ctrl-h) open. Floating over the wire will tell you exactly what is in the wire. Ben

Re: Compatibility issue with PXI1031, 64bit processor and windows xp

LabVIEW does not yet officially support 64 bit XP. We have done some basic testing, which indicated that the environment generally runs, but we have not tested extensively, so it's quite possible that there are bugs or unexpected behavior. Regards, Ryan K. NI

How do I determine the appropriate buffer size to use to generate a particular frequency waveform?

I am trying to generate a continuous waveform at all frequencies ranging from 100Hz-20kHz. The standard buffer size of 1000 works well for multiples of 100 between 100 and 1000Hz and for multiples of 1000 from 1kHz-20kHz. However, when I try to generate waveforms at intermediate values such as 1800

Re: Compatibility issue with PXI1031, 64bit processor and windows xp

Hello, National Instruments does not currently offer or support products that are certified for use with 64-bit processors and corresponding Windows operating systems. Note that the 64-bit versions of Windows are not compatible with previous 32-bit Windows drivers. All National Instruments hardwar

Virtual memory

Hi, I get this message sometimes when I run my program: System is low on virtual memory My program has two loops, and I use shift registers on these two loops. I have a loop for data array and a loop for graphing the data array. My data when put into excel is more than 1500 rows. Is it gi

Re: Is the SVT Zoom FFT really more accurate than a regular full FFT with a large sample?

What are the basic differences between Baseband, Subset, and Zoom FFTs and when should I use each? Enjoy!!

The sub VI does not pass statistic vi data to the main VI numeric indicators.

The subVI is a Daq AssistantVI with a Statistic VI. Numeric indicators are wired to the statisic VI. A graph indicator is also wired to the signal from the Daq Assistant. The SubVI works by itself. Can not figure out why the numeric indicator and graph, that are wired to the connector pane, do n

Re: I need some documentation of wire data types

Thank you.

Re: mozilla

Hello Emiliano - What version of LabVIEW and what Platform are you using? Refer to the LabVIEW Release Notes for the version of LabVIEW you are using for the required version of Mozilla. Also, if you installed Mozilla in the default location, the LabVIEW installer automatically installs the brows

system low on virtual memory

Hi, I get this message sometimes when I run my program: System is low on virtual memory My program has two loops, and I use shift registers on these two loops. I have a loop for data array and a loop for graphing the data array. My data when put into excel is more than 1500 rows. Is it gi

Re: UDP problems when building executables

There could be a number of reasons for this behavior. It may be that the function is not working properly on the run time engine (RTE). The best fix for this is to see if the problem persists in LV 7.1. It is the best version of LabVIEW to date. If you can post code that shows the problem then i

Re: Cannot open Labview 7 without "not enough memory" error

I figure there are two possiblities. LabVIEW is poorly installed on your system causing the error or your VIs are corrupted. You can test the former by installing LabVIEW on another computer. If you can open the VIs there, consider contacting NI for ways to more throughly remove NI products fro

Wanted: #define

From my days as a C programmer (shudder) I have to say I do miss the #define. I realize LabVIEW cannot really have an exactly analogous feature because the scope of .vi is too different from the scope of .c, but there must be some way to get the same functionality. I figure a global might be

Re: Wanted: #define

Hi; I think config files can also be considered. You can initialize a particular variable (I32, Bool, etc) using config files Just my thought + Dr. Hamid R. Yazdi Federal Mogul Manufacturing technology 3935 Research park drive Ann Arbor, MI 48108 Tel: 734 222 4108

Re: Virtual memory

Lai, Ann wrote: > Hi, > > I get this message sometimes when I run my program: System is low on > virtual memory My program has two loops, and I use shift > registers on these two loops. I have a loop for data array and a > loop for graphing the data array. My data when put into excel is > m

Re: Wanted: #define

[EMAIL PROTECTED] wrote: > Hi; > I think config files can also be considered. You can initialize a > particular variable (I32, Bool, etc) > using config files > Just my thought strict typedef? -- Dr. Craig Graham, Software Engineer Advanced Analysis and Integration Limited, UK. http://www.aail.c

Re: Error opening file:"The file XXX.vi is not a VI. Select Another?" Whats wrong?

The author of the files is a professional who wrote a program for me a couple of years ago. If I try to open the file in Notepad, I get a Windows ! message that says "Access is Denied". I am trying to open the file directly from the LabVIEW startup screen, I am fairly sure that the process I am u

how to pass stop button's boolean value to subvi's subvi

There is a stop button on my main vi and the boolean value could be passed to subvi using control reference. So the subvi could stop when the stop button on main vi's front panel is pressed. My question is how I can pass that boolean value to nested subvi, so once the stop button in main vi is pres

Re: how to save my 3 channel data like this

I have a problem. When I tried to combine my vi with yours there was a error. It says 'Array to spreadsheet String:contains unwired or bad terminal,you have connected two terminals of different types' I am not well experienced with Labview. Thus , I need your help at this point.You can find the pic

Re: Converting html documents to plain text using LabVIEW

Hi Jim, Very efficient VI. Is there an OpenG version of this? Regards, Khalid ps: I'm sorry if this spams "notification" mail to all others on this thread.

Re: Wanted: #define

At 16:23 -0400 06/15/2004, George Gatling (Contractor) wrote: >From my days as a C programmer (shudder) I have to say I do miss the #define. I >realize LabVIEW cannot really have an exactly analogous feature because the scope of >.vi is too different from the scope of .c, but there must be some

Re: Wanted: #define

I thought about using an file to store the values in and doing elaborate sorts of things to make it "easier" to update the values, but in truth that is all overkill for what I am trying to do. These are not values that the user would ever want to mess with... things that are currently just con

How to get rid of LabVIEW icon from EXE shortcut I created on the desktop?

After I create shortcut for my LabVIEW application=92s EXE on desktop, LabVIEW icon shows up. This default LabVIEW icon also shows up in Windows explorer window. ( This is not the one which I create in Labview icon editor. Icon created in Icon editor only shows up on toolbar) How to get rid of t

Re: Is there any way to have more than 28 connection terminals?

Hey Gonzo, My first thought is that you really might want to reconsider this VI that you are developing. Is there another way that you could design it such that it does not require more than 28 inputs/outputs? Some other information that could be useful: what do you plan on calling this dll from?

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