How can I use Labview to create a graph of digital voltage signal vs. Time?

I am measuring a digital voltage signal and I need to generate a graph vs. Time and be able to add user controls to start/stop the graphing and be able to export the graph to other programs such as MS Excel. Any help you could give would be much appreciated. Thank you.

You probably want to use a chart. Place it inside a while loop that runs continuously. The chart should be in a case structure so it is bypassed depending on the boolean pause/continue switch.
To save the data, get the "history data" of the chart via a propery node and save it to a file. It is probably easiest to save it to an ASCII file. Most other programs will be able to read it.
See how far you get. If you get stuck, post your VI and we'll help you.
LabVIEW Champion . Do more with less code and in less time .

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How can I use LabVIEW to send the equivalent of a CTRL D (in VT 100 format) out the serial port of my computer?

I am trying to write a vi that interfaces with a piece of OEM equipment that is set up to talk with a VT 100 terminal. I can't seem to locate the ASCII equivalent string (if there is such a thing) of a CTRL D. Is there a vi that emulates VT 100 commands?

If I recall, CTRL-D is EOF on most ASCII tables.
You'd probably have to use an escape sequence
or if you can use an unsigned 8-bit that might be
easier.
In article <[email protected]>, TLS
wrote:
> How can I use LabVIEW to send the equivalent of a CTRL D (in VT 100
> format) out the serial port of my computer?
>
> I am trying to write a vi that interfaces with a piece of OEM
> equipment that is set up to talk with a VT 100 terminal. I can't seem
> to locate the ASCII equivalent string (if there is such a thing) of a
> CTRL D. Is there a vi that emulates VT 100 commands?

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Hi Zannat,
Don't get scared. Cookies are the small file which stores your settings for a website, such as location details, login details, language details and so..
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How can i use the same front panel graph in more than one events in an event structure?

i want to display the signals from my sensorDAQ in a graph.but i have more than one event in the event structure to acquire the signal and display it in the graph.the first event is to acquire the threshold signals and its displayed in the graph as a feedback.after the first event is executed, i will call the second event,where the further signals are acuired and compared with the threshold signals from the event 1.my question is how can i use the same front panel control in more than two events in the event structure?please answer me i'm stuck.
Solved!
Go to Solution.

Hi,
I have attached here an example of doing the same using shift registers and local variables. Take a look. Shift register is always a better option than local variables.
Regards,
Nitzz
(Give kudos to good answers, Mark it as a solution if your problem is Solved)
Attachments:
Graph and shift registers.vi ‏12 KB
graph and local variables.vi ‏12 KB

New to LABVIEW. How can I use one analog channel to trigger acquisiton of a signal on another analog channel?

I am new to using Labview and have been tasked to write data acqusition program for my company. We are attempting to log 6 machines, each with their own asynchronous trigger (I can't use one trigger for all 6 machines). I have the idea to use (for example) ai0 for the measurement and ai1 for the trigger (for one machine), yet I see nothing in the documentation on how this is done. I have tried playing around with the DAQ express VI (I am using Labview7) but still don't see a way to have the setup I am looking for. I'm sure this is a relatively easy question, but I'm unsure where to go to look for an answer. Any helpful pointers or guidance in the right direction
would be very helpful!

If what you want to do is start the acquisition of channel 0 when channel 1 reaches the trigger condition and not start channel 2 until channel 3 reaches it's trigger condition, then no, you cna't do that unless you have multiple daq devices. What can be easily done is continuously acquire all channels and monitor your trigger channels. When the trigger condition is met, then perform the analysis/logging. On the Analyze>Waveform Monitoring palette is the Basic Level Trigger Detection function. Use one for each trigger channel and have it return either the index or relative time of the trigger occurance. This value can then be used to idex that portion of the measurement channel that you're interested in.

How can i use labview for communicating with pic18 microcontroller through usb port?

Hi all,
I want to make a DAQ card using pic 18 microcontroller which has a built-in usb protocol. I have the firmware of this
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Which labview version do you have. Up to labview 7.1 it was no USB raw communication options. I have heard it did not work well in 7.1, but from 8.x most of the errors were fixed.
Here is a link it should be useful http://forums.ni.com/ni/board/message?board.id=170&message.id=340676&query.id=365864#M340676
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How can i use labview.tlb to control Labview from an external application?

Hi,
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Thanks

Hi,
> Hi I am fighting a similar problem and so far I found this: Calling
> LabVIEW from C++ Using ActiveX
>
> http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?>p_guid=B45EACE3E21356A4E034080020E74861&p_node=DZ52051&p_submitted=N&p_rank=&p>_answer=&p_source=External
Thanks for the link, i actually already found this link before. I've
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of the project, it was probably too easy for me at that time:-) But
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How can I use iWeb to create website that contains a lot of downloadable audio files?

Hi
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How can I use a manually created help file

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Hi,
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How can I use LabView to control Altera Scripting

Hi
I have kind of run into a stone wall. I am building a production test executive based on LabView. Part of this process includes loading an FPGA image on to a CFI flash that is in the JTAG chain. I am trying to make so that the production operators don't have to open a second application, select the right FPGA and Flash navigate to the file then load it, then go back to LabView and run the rest of the tests.
Altera has a command line interface that will let me load .cdf file. The problem is that nowhere in Altera’s documentation does it show me how to first load the “Parallel Flash Loader IP” into the FPGA. The flash loader acts as a temporary bridge between the JTAG input and the CFI Flash. I have looked on Altera’s Forums and have had an open ticket with Altera’s support engineers for more than a week.
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C:\altera\12.1sp1\qprogrammer\bin>quartus_pgm -c USB-BLASTER -m JTAG S_FPGA.
cdf
Info: *******************************************************************
Info: Running Quartus II 32-bit Programmer
    Info: Version 12.1 Build 243 01/31/2013 Service Pack 1 SJ Full Version
    Info: Copyright (C) 1991-2012 Altera Corporation. All rights reserved.
    Info: Your use of Altera Corporation's design tools, logic functions
    Info: and other software and tools, and its AMPP partner logic
    Info: functions, and any output files from any of the foregoing
    Info: (including device programming or simulation files), and any
    Info: associated documentation or information are expressly subject
    Info: to the terms and conditions of the Altera Program License
    Info: Subscription Agreement, Altera MegaCore Function License
    Info: Agreement, or other applicable license agreement, including,
    Info: without limitation, that your use is for the sole purpose of
    Info: programming logic devices manufactured by Altera and sold by
    Info: Altera or its authorized distributors. Please refer to the
    Info: applicable agreement for further details.
    Info: Processing started: Thu Oct 03 18:16:53 2013
Info: Command: quartus_pgm -c USB-BLASTER -m JTAG S_FPGA.cdf
Info (213045): Using programming cable "USB-Blaster [USB-0]"
Info (209060): Started Programmer operation at Thu Oct 03 18:17:19 2013
Error (209062): Flash Loader IP not loaded on device 1
Error (209053): Unexpected error in JTAG server -- error code 5
Error (209012): Operation failed
Info (209061): Ended Programmer operation at Thu Oct 03 18:17:21 2013
Error: Quartus II 32-bit Programmer was unsuccessful. 3 errors, 0 warnings
    Error: Peak virtual memory: 376 megabytes
    Error: Processing ended: Thu Oct 03 18:17:21 2013
    Error: Elapsed time: 00:00:28
    Error: Total CPU time (on all processors): 00:00:03
Solved!
Go to Solution.

Hi Eric,
I got it figured out today, basically you have to load the Parallel Flash Loader first into FPGA ram. It is a special .sof file (pfl_epXXXX.sof) based on your FPGA. Code is actually pretty straight forward, using the Sys Exec VI. Use the windows based programmer to generate the .cdf file that identifies your FPGA, attached Flash and .pof file .
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I used a 2 element array going into a four loop
cmd /cquartus_pgm.exe -c USB-BLASTER -m JTAG -o P;pfl_epXXXX.sof
cmd /cquartus_pgm.exe -c USB-BLASTER -m JTAG S_FPGA.cdf
Defining the working director C:\altera\12.1sp1\qprogrammer\bin
And added match string with "Successfully performed operation" on the output in the loop to make sure everything loaded correctly then adding the array to give me a overall P/F
To anyone doing this same thing Altera's documentation is poor to say the least. It took most of a week to figure this out Not allowed to upload code, so anyone wanting details just post here and I will try to help. This was painful, with lots of lessons learned.
Thanks for the interest though
Best regards John

How can I use LabVIEW to ground floating SCXI-1520 channels (in order not to lose scanning capabilities from the multiplexer)?

Currently I am reading quarter bridge strain with several SCXI-1520s. When in MAX I noticed my values were no longer reading after a certain gage and as I attempted to troubleshoot, found out that the multiplexer in this module will not scan past any open channel (or if it does, channel results are not consistent) for a very logical reason. If I lose a gage, I usually lose any data from any subsequent gages which we really cannot afford.
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How can I use LabVIEW 6 on a SCXI-FRQ8 module?

Hi, here is a description of our problem. We hope that you will be able to help us.
We bought from NI, a few years ago, some SCXI-FRQ8 modules. (Those modules were made by a company called Developpement Ingenierie in France) The problem is, we can not update to the version 6 of labview since we do not have the drivers to install Labview 6. The drivers we have are for Labview 5.x and 4.x.
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We would like to be able to install Labview 6 on these modules and if we can
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The driver for the SCXI-FRQ8 provided by DI originally did not include the block diagrams. So if you try to use them in a newer version of LabVIEW, you will receive error messages because LabVIEW needs the source code to recompile the code into the newer LabVIEW format.
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LV 7.1 - How can I use installer to create folder with its files included w/o adding each file?

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How can I use Labview to create a graph of digital voltage signal vs. Time?

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