2 digital signals keep using pxi 6544

Similar Questions

• How to read the digital I/o using PXI-7813R?

  Hi guys,.

  I'm reading a digital signal by using one of the ports in the PXI-7813R. The 7813R has 5 digital ports or 39 lines for playback of digital data. I have connected a SCB-68 as the physical hardware interface for 'plug-in' a 5V adapter, which will act as my signal at the moment.

  After you configure the PXI via MAX, I wrote two codes, one for my host pc and the other to control the FPGA through the host. But I think, I can have more complicated or completely gone in the wrong direction.

  Any help in the drafting of these codes would be well appreciaetd.

  Thank you, Anoop

  You need the FPGA to sample the signal how often you expect the device to send the data.

  If you write your data in the FPGA for the DMA, then on the side PC you just have to read the DMA.  I like to think of the DMA as a queue.  It makes it easier for me to understand how it works.

• Graph of digital signal using binary numbers.

  I need to generate digital signals 4.
  I have created a binary number which represents the 4 signals. (I don't know if I integrate it properly).

  Issues related to the:

  1. How can I represents the binary number (4 signals) in a digital chart?

  2 - is the right way to generate digital signals?

  I need something like this:

  

  Your code is meaningless.

  • Why you build an array with one element is there is always only one item?
  • Why are you doing floating point operations dealing with whren of integers?
  • Your VI does not have a digital signal graph.

  Try something like the joint to rotate the pieces...

• Analog input problems using PXI-6232

  I tried to solve this problem for a while now without a bit of luck. Solution suggestions are welcome.

  I use a PXI-6232 with LabView 8.5.1 to accept signals analog several of my sensors. Based on the signals as a PWM signal is generated and the output using PXI-6713.

  Some of the analog input signals have spikes in them, which occur at all times during the tests. I watched the same signals on an oscilloscope - without crampons. I change my hardware configuration, and the spikes still occur in the same places. It seems that the program makes some resets resulting in measurement errors.

  I have attached the VI and a JPEG of measured inputs.

  Thanks in advance

  Concerning

  Vadim

  I was first confused of your time scale but it seems that these spices occur every 20ms (not s) what to a line 50 Hz noise due to switching power converters (or a diode without compensation bridges )

  Another clue was the measure of the scope. While using the application scope, you opened a groundloop so the spikes because of the dI/DT through the groundloop are another way to get around.

  So I'm pretty sure this isn't data acquisition (in this case) this is your configuration.

  Provide a cleaning (low R AND L low) path of power (keep them close and twist slightly if possible), add a filter to down the dI/dt, identify the ground loops.  (Use your scope with a little as a sensor at the entrance to reel and catch magnetic fields can open eyes)

  THEN to clean the last ears (on the acquisition of data) to get the last ppm use selfs

• How do I configure other digital ports except port 0 of daq 6351 acquisition of digital signals

  Mr President.

  I can acquire digital signals using 8 lines of port 0, but I have to get the waveform Digital 24-bit. So please tell me how to configure other DIO ports so that I acquired digital signals using these DIO line also

  You should be able to create a task DAQmx to read Port0, Port1 Port2.  When you read the DAQmx data, you must combine the port if necessary data table.

• frequency of the digital signal 6009

  Hello, how to generate the digital signal with frequency 50 Hz using NI USB-6009?

  You can take a look at this:

  Can I use a generation of impulses with the counters on the USB-6008/6009 case?

• Generation of digital signals through external trigger pulse on PCI 6251

  Sir I want by NI 6251 because I read it has the ability to generate and acquire digital signals on port 0. I want to know that can I generate external clock wave triggering (providing impulses to a line on the acquisition of data)?

  Hi Ali211,

  Yes, you can use a source of sample for the digital input/output clock external clock. You can connect the external clock source to one of the lines PFI (PFI0-PFI15) and specify the source clock sample like this outer line of PFI.

  There are some shipping DAQmx examples that you can start with. Find the examples by clicking Help > find examples in LabVIEW.

  DAQmx continually reading digital channel with External Clock

  DAQmx channel External digital writing Clock

  Hope this helps.

  Chris G

• Can I use PXI embedded controller connected to the PC under LINUX operating system

  Hi all

  We ara tries to connect to PXI8106 (in 1042 chassis) to PC under LINUX via ethernet (cable cross at the moment), is the version of labview 8.5.

  Can I use PXI embedded controller connected to the PC under LINUX operating system?

  If Yes, where can I find its configuration in the .ini file?

  Thanks in advance.

  Hello bachir_elec,

  I'm sending you two links that I don't provide the information you need.

  Using Linux on an Embedeed PXI controller:

  http://digital.NI.com/public.nsf/allkb/821E0C115A3B4EF286257069004B8352?OpenDocument

  Configuration of your PXI Linux system:

  http://digital.NI.com/public.nsf/allkb/5CEEC941FB7B0488862573F700653B21?OpenDocument

  You can take a look?

• How to draw a part of a digital signal

  Hello, I have a digital signal, and I would like to draw just the 10 first or second 10% of the curve on a digital chart. Could you please help me on this. What is memory, and the effective, faster way to do this.

  Thank you

  Use GET subset of waveform:

  http://zone.NI.com/reference/en-XX/help/371361K-01/lvwave/get_waveform_subset/#Instance7

  There is a polymorphic digital version of it.

• PCI6120-acquire an analogue signal on each edge of a digital signal

  Hello

  I have the card PCI-6120 and Labview 7.1.

  I have a digital signal of the encoder. Am interested in buying an analog voltage on each rising edge of the digital signal. In addition, I have another digital signal (index) between which I wish to make the acquisition.

  I tried several options. But I can't get on the digital dashboard via the hardware. Please help urgently. Alternative, I migrated to the acquisitions acquisition high speed analog and two digital channels and deteting change in software programming and then find the analog voltage. Which is heavy and inefficient.

  Kindly guide correct programming technique.

  Concerning

  Marie-Hélène

  Hi, Maud.

  Thanks for the update and I hope that your well today.

  Sorry for the delay but it was the Easter holidays!

  Thank you for your congratulations.

  I put your sampling frequency at the maximum rate of the clock source (encoder). The DAQmx driver uses the sampling frequency (and the number of samples per channel) information to perform various calculations and set sizes for the buffer.

  If you set it too high, nothing will happen-guests still just on each edge of the unit receive. If you set it too low, your stamp could be too small and you may lose data.

  Hope this helps,

• MyDAQ - generation of a digital signal and display on an analog waveform graph

  Hello

  I use the MyDAQ OR generate a digital waveform with a Frequency adjustable. This is implemented in a program, I already wrote it, which generates a TTL 'like' impulse out of the sound card. I display the result on a graph of analog wave form, and I would like to be able to display the digital signals generated by the myDAQ on the same graph. (Not in the same time, one or the other, activated by a button). I've been messing around with tables and conversions, but I can't really do with all this.

  It's the vi, I did to generate the digital signal of frequency with MyDAQ. Any suggestions on how to do this if the following is false, would be great too, as I just got the MyDAQ a few days ago. I think there must be a better way, but it's the best I could come up with so far.

  

  Hi Jonny,

  The General logic, that you use to create a digital pulse train is very good. This VI you wrote should work and create the pulse train based on timing of software (which is fine because you have not DIO clocked by the material on the myDAQ anyway). However, it is generally advised to start the DAQmx task just before your time loop and then disable the task after the while loop when you press stop.

  For reference, there are a few examples of good enough LV that I recommend you watch too much for this application. If you try just to create a digital pulse train, the example Gen dig Pulse Train - Continuous.vi is a good example that uses a counter to create a digital pulse of your desired frequency train. It is generally the preferred method to create a pulse train, if you have equipment available to do (the myDAQ there a meter). Otherwise, there are a few examples DIO who write continuously in a digital line / port.

  If you are unfamiliar, you can find the examples by clicking Help > examples find... into LV then navigate to hardware input and output > DAQmx > generating digital impulses or the digital generation.

  Also, here is some additional information on the myDAQ and its counters:

  myDAQ counters

  myDAQ manual

  Hope this helps.

  Chris G

• time extraction of the digital signal

  Hello

  If I have digital signals from optical barriers and to extract the time (for a body that passes these 2 obstacles) how can I retrieve this day there using Labview.

  THX

  I have chata,

  Thanks for the answer, and I hope that your well.

  Here's an example I've done for a client, eager to discover the time of a flat section of its waveform.

  In your case, you must make a detection of pic on both codes, then less locations and a few x with the number of the sample to get the time.

  Let me know what you think.

  Kind regards

  James.

  PS Sorry code is a bit hasty.

• How to generate a digital signal on a negative slope of the clock?

  Hello

  I need to get out a finished length of the Digital pulse which will begin on request to the negative of the clock slope import (or export).

  I try to get the clock, exported or imported, but in any case, I can trigger output signal on the negative slope.

  What is the trick?

  Thank you

  Pawel

  What camera you use to build your digital signal.  What is the source of the clock?  You can attach your vi?  Normally, there is a function of data acquisition for configure the trigger where you choose the source of the trigger and the trigger slope (rising or falling), should be declining to a negative slope.

  

• How can I get digital signals (interface UART) with a microcontroller with NI USB-6008?

  I have acauired a few analog signals by A/D (3 channels). I put each scanned data on 3 digital output with a microcontroller. I want to see if it is possible to import these digital outputs 3 to a PC via a USB-6008? It's like the connection of the output to the digital input of the USB-6008 and import the 3 channels simultaneously to LabView? Do I need to use some other hardware like USB-8451 and connect the clock of the MCU to USB-8451?

  Saraydin,

  The digital I/o on the USB-6008 is a software program only, so unless your signals are rather slow, it probably will not work for you.  In general, the procedure would be to connect each signal to one of the digital lines on the map and then set up a digital entry into LabVIEW task to read the three channels.  If you use a device that has clocked by the digital i/o hardware, you then your input clock signal and use it as the sample for the task clock.  Here is a list of USB devices supporting DIO clocked by the hardware.  Also, there is an example that comes with LabVIEW, which shows how to do this.  You can get to it in LabVIEW by going to help > find examples.  When the example Finder window opens, navigate to hardware input and output > DAQmx > digital measures > Cont read dig Chan-Ext Clk.vi.

  The 8451 is specifically for I2C and SPI, and would be great if you try to make one of these protocols, but otherwise I would recommend the devices in the list I linked above.

  -Christina

• Acquire 2 digital signal of custom scale (Engg units)

  I am a newbie to the world of DIO.

  I write a VI to acquire 2 digital signals. one of a load cell and others for engine rpm (legumes). I need acquire these two signals and then convert them to engg units using the custom scale and write it in a txt file with timestamp.

  Please suggest the best ways to accomplish this task.

  Thank you

  DAQG

  Look at the examples on DAQmx in the finder of the example.

  You would not really acquire 2 digital signals.  You would acquire an analog signal of the load cell.  A digital acquisition or against, this is what would make you the acquisition of the motor.  Looking for analog and the counter measures in the finder of the example.  Some of the example should show you how to apply the custom scale.