continous digital output of NI 9476

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  Jasonwaterz wrote:

  I then had the red light coming out of the helmet but now its does not come in red and in the sound settings in system preferences its impasse on "optical digital output Port.

  Try resetting the NVRAM/PRAM http://support.apple.com/kb/ht1379 memory

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  First of all sorry for my English, I will try to explain what I want to do.

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• redeclenchables strange behavior digital output

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  DAQmxCreateDOChan(_taskHandle,"/Dev2/port0/line6","",DAQmx_Val_ChanPerLine);
  DAQmxCfgSampClkTiming (_taskHandle, "" / Dev2/Ctr0InternalOutput ", _clockRate, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, static_cast (_sampleCount)");
  DAQmxCfgOutputBuffer (_taskHandle, static_cast (_sampleCount));
  DAQmxCfgDigEdgeStartTrig (_taskHandle, "/ Dev2/PFI4", DAQmx_Val_Rising ");
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  DAQmxWriteDigitalLines (_taskHandle, static_cast(_sampleCount), FALSE,-1, DAQmx_Val_GroupByChannel, _pDigital, NULL, NULL);
  DAQmxStartTask (_taskHandle);

  sample clock:

  DAQmxCreateTask ("", & _taskHandleCO);
  DAQmxCreateCOPulseChanFreq (_taskHandleCO, "/ Dev2/ctr0","", DAQmx_Val_Hz, DAQmx_Val_Low, 0,0, _clockRate, 0.5 "");
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  DAQmxStartTask (_taskHandleCO);

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  Thank you.

  It disappears after reset configuration. Might be interesting for future reviews.

• Is it save to use the digital output as a digital input for another channel signal

  Hi all

  I know it's a stupid question, but I don't have another generator of signals by hand. What I want to know is, can I use the signal digital output of my USB-6001 as an input for the same signal device, but on other digital port? I wasn't directly because I don't want to burn the device...

  Thank you

  Done all the time. No problems.

• take the digital output USB-6001 always high or low in c

  Hi all

  I am new to the NI DAQ interface. I have a USB-6001 and I am trying to use this device to control some flowchart in C. What I want to do is:

  * set digital output lines with high and low intensity and change their status as needed (in C).

  I tested the device NEITHER Max--> Test panels and found that the device is capable to do that. Then I try to do in C. I have checked hace examples and function I use is one called "DAQmxWriteDigitalU32". I have problem in the understanding of its input parameters. I tried something with my own knowledge, but it does not work as I expected. Here is a test I did:

  data uInt32 = 1;

  Int32 wrote;

  TaskHandle taskHandle = 0;

  DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
  DAQmxErrChk (DAQmxCreateDOChan (taskHandle, "Dev1/port0/line7", "", DAQmx_Val_ChanForAllLines));
  DAQmxErrChk (DAQmxStartTask (taskHandle));
  DAQmxErrChk (DAQmxWriteDigitalU32(taskHandle,1,1,10.0,DAQmx_Val_GroupByChannel,&data,&written,));

  taskHandle = 0;
  DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
  DAQmxErrChk (DAQmxCreateDOChan (taskHandle, "Dev1/port0/$line0", "", DAQmx_Val_ChanForAllLines));
  DAQmxErrChk (DAQmxStartTask (taskHandle));
  DAQmxErrChk (DAQmxWriteDigitalU32(taskHandle,1,1,10.0,DAQmx_Val_GroupByChannel,&data,&written,));

  I just want to set ' Dev1/port0/line7' and ' Dev1/port0/$line0"at a high level, but only ' Dev1/port0/$line0' answer me. The second parameter of the DAQmxWriteDigitalU32 function is numSampsPerChan. If I replace (currently 1) with a higher value, such as 100, I see that "Dev1/port0/line7" sends a number of 1 output, then back to 0. So I guess that the problem is just that I understand not all parameters for the DAQmxWriteDigitalU32 function. Is someone can you please tell me how I can set up a line of digital output 1 or 0?

  Thank you!

  Hongkun

  Hello

  I finally find a way to do it! The feature works very well, and my problem was not set the data value to write correctly. It seems that if I want to write a 1 to the port0/line1, I put "data = 2 ^ 1" rather than "data = 1", because by default it is the second bit of the port.» Similarly, "data = 2 ^ 7 ' high level to port0/line7. I find that this setting is surprising when you want to control an individual line. It seems more reasonable when you control the whole port. In any case, is to solve the problem!

  Thanks anyway!

  Hongkun

• NI USB-6501 digital output problem

  Hello

  I use DASYLab v.11 and I'm working on an interface with the NI USB-6501 where I'm putting a digital high on four ports.

  With the module "NOR-DAQmx - digital input", I managed to read the digital inputs of the ' NI USB-6501 ".»

  It's only the "NOR-DAQmx - digital output" I can't go to work.

  Using 'NI MAX' of NOR I have easily can emmit my four LEDs in the way of my High/Low ports.

  But not with DASYLab. When you use DASYLab tension on the ports remains unchanged.

  Now, I have a switch module, generating 5/0, directly connected to the digital output module, which is assigned to my four output ports for my task.

  I also tried with a module of relay between the two without success. I also tried to use 1.5 above instead of 5 without success.

  I use the option 'Bus (0/5 supply) for the module "Digital output".

  "NI Max", I configured the ports as "active drive.

  Any suggestion of what I might be missing?

  Thank you

  Martin

  Hmm, four ports, or four lines?

  A port consists of eight lines. Each line can control an LED (ON / OFF ~ 0/5V).

  If you have created a task to dig-out to control a port, 5V to this port sending sets all lines of this port to 'high '.

  You need to 255 for each line one too high port (at the bit level: 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1).<- eight="">

  Or, you can create a dig out tasks to control four lines of a specific port.

  Four lanes of the EEG DAQmx DigOut module.

  Each of the channels of the modul will feed a single line of the task/device.

  Four switches will then turn the lights, or turn off.

  Make sure, that the 'bitposition' is the number of correct line (see picture).

• NI 9474 digital output errors

  Hello

  I'm playing with NI 9474 to learn how the outputs digital work with labview. However, I can't even the basic element down. I have a 9v battery connected to the unit and an element of resistance hung on one of the terminals of the device output. So, I just try to get labview to produce a digital output.

  However, I get an error when I try to run the labview program. I tried to search my error on the knowledge base, but has been unable to find it. So if someone could help me understand how digital material output works with labview, it would be awesome!

  I have attached my diagram!

  Thank you

  It's pretty basic. If you make an entry, you must specify the values to be written. For digital, values are true/false or 1/0.

• CV 1457RT and VBAI: Double digital output

  I have a problem with the CVS 1457RT and the VBAI.

  I configured two steps with the VBAI for the CVS.

  The first step: I've read about the digital input which should trigger my second step.

  the second step: I acquire an image (with an ACE of the Basler) and then I measured 8 distances and count 2 edges. After this, I generate a pulse on the digital output once.

  After that I did a VI in LabVIEW that measures the time between the IO.

  In this VI and on the module which is connected to the digital output, I see that the putput pulses twice but only a few times.

  I guess you get noise on your digital input and trigger twice, so that it works the inspection twice, giving you two pulse output.

  You can implement a digital filter, where the value that comes out of the filter does not change until entry remained at the same value for the N samples.

  Bruce

• separation of two edges using a digital output

  I am using a DAQ, PXI-6229 map and programming in c# .net.

  I'm claiming a falling edge on PFI12 used as a digital output, and I need to measure the time between this edge and a second front on PFI8 used as a digital input.  I have implemented the code using some examples I found.  I don't know when to to argue the signal on PFI12 in order to be read at the right time.  Playback must be put in place before the signal is asserted, but I do not know how to set it up it up properly.

  Here is the code I have so far:

  Public Sub MeasureAcquisitionTime()
  {
  DigitalSingleInputTask = new Task();
  CIChannel counterSetup;
  firstEdge = CITwoEdgeSeparationFirstEdge.Falling;
  secondEdge = CITwoEdgeSeparationSecondEdge.Rising;
  Double minTime = 10-3;
  Double maxTime = 60F-3;
  String auxCounterInput = "/" + CardName + ' / PFI12 ';
  String gateCounterInput = "/" + CardName + ' / PFI8 ';
              
  counterSetup = DigitalSingleInputTask.CIChannels.CreateTwoEdgeSeparationChannel)
  CardName + ' / ctr1 ', 'counter',
  minTime,
  maxTime,
  firstEdge, secondEdge, CITwoEdgeSeparationUnits.Seconds);
  counterSetup.TwoEdgeSeparationFirstTerminal = auxCounterInput;
  counterSetup.TwoEdgeSeparationSecondTerminal = gateCounterInput;
  DigitalSingleInputTask.Control (TaskAction.Verify);
  runningDigitalTask = DigitalSingleInputTask;
  counterInReader = new CounterReader (DigitalSingleInputTask.Stream);
  Double data = counterInReader.ReadSingleSampleDouble ();
  }

  I'm glad to hear it.

  paofthree wrote:

  Is there a way to make a measure of separation of two edges on the analog inputs of the PXI-6229?

  The only way would be to constantly acquire the analog input voltage and calculate the separation of the two edges in the software.

  Best regards

• Low 6343 USB digital output

  Hello

  I use the digital output to USB-6343.

  Sometimes when I stop writing (clear the task) the rest at high output pin (I see it in the oscilloscope).

  Is it possible to set that after earasing task output pin will always be low?

  Thank you

  Leonid

  Thank you

• Measure the time difference between a digital output and an analog input that responded to the questionnaire

  Hallo,

  I use the following system:

  • OR PXI-1044 with controller NI PXI-8109
  
  
  • OR PXI-2564 switch module to turn on the monitor of my test device
  
  
  • Data acquisition multifunction NI PXI-6259 to measure the signal that responded to the questionnaire jump

  The two cards are the same - PXI trigger bus. For both, PXI-2564 and PXI-6259 I use DAQmx to set the reading and writing of the channels.

  Now, I want to measure the time between the digital output, my unit turns and the analog input, which measures the response of my system.

  I can't do work by myself, please help me!

  I thank Ludwig.

  Hi Ludwig,.

  If you can't give us any VI we have difficulties with to help you.

  Because I Donat knowledge how your program is mounted it is not easy to know where you should enter signals.

  Here's a question similar to yours:

  http://forums.NI.com/T5/LabVIEW/best-way-to-measure-time/TD-p/178704

  and 2 external links:

  http://www.ehow.com/how_8698983_measure-time-LabVIEW.html

  http://objectmix.com/LabVIEW/385152-how-can-i-use-LabVIEW-measure-time-between-analog-pulses.html

• NI 9474 digital output

  Hello

  I am trying to learn labVIEW DAQ and right now I'm trying to understand how to use NI 9474 with labview. NEITHER 9474 is a device with digital outputs. I am attaching a (badly drawn) diagram of how I have my real wired circuit. For some reason, the voltage at the terminals of the resistance is 9v instead what that either the digital output should be when I put assistant daq for 1 sample on request. When I change to continuous samples daq assistant, it reads 4.6v. So I wonder what am I doing wrong and what should my digital output be?

  I've attached my vi file, if someone can you please help me understand how to use NI 9474 with labview?