Repeat the Scans with DAQmx read/write

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  Simple question.  I have currently not creating a task or starting a task, I simply create a channel and reading that chanel.

  It is...  Why I don't get a timestamp when you do and do I create a task to get one of this?

  There is a timestamp when you use the DAQ Assistant or when you choose to return a data type of waveform with DAQmx Read.

  You can't do a reading without a blemish. You don't have to create the task in MAX, however.

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• Synchronization with Serial read/write problems. can not get the functionality of the terminal emulator

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  I am writing a VI to control PWM with a microcontroller via a serial port. I wrote a simple code for the microcontroller that allows me to set the ratio of duty cycle on a scale of 0-65535. It works very well with Termite of Compuphase (RS-232 plug); The microcontroller invited me to an entry, expected that I would one, updates and expected another entry when I decided to send him. Now, I'm trying to get the same functionality on a LabVIEW vi but hit a snag.

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  I was also the frequency of timeout errors; Error-1073807339 at VISA Read, reason Possible: VISA Hex 0xBFFF0015. I removed the option to stop the while loop if there is an error so I can run but always pops up an error on the judgment occasionally. Could the problem of synchronization always cause me problems?

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• has triggered the numerical sequence of read/write

  Hello

  I'm pretty sure it's impossible to do in Labview, but thought I would ask the question just in case:

  On a digital falling edge I need to define a digital line on a highest PCI-6224 and a low, then read sixteen lines as a port.  Output high and low lines should change status then and sixteen lines should be read again.

  The process is repeated on the edges of successive falls.  The time between edges may be as short as 11 microseconds (90kHz).

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  Thank you.

  Hi Simon,.

  I have an idea how to do that using the DAQmx card.  This has not been tested, but I think it should work with just a few tricks with DAQmx.  There are three tasks that will be required:

  Meter output
  ==============

  This should be a task redeclenchables meter.  Take a look at the example in the example finder LabVIEW under Hardware Input/Ouput > DAQmx > generating digital pulses > Gen dig Pulse Train-finishes-redeclenchables.

  1. This should generate two pulse whenever the external trigger is received so your 11us impulses are the trigger for this task.
  2. these impulses are then for each reading of digital lines:

  Rising edge - changed lines to enable
  Falling edge - read data.

  By making these large enough pulse (> 140ns) that will take care of the running lines.

  3. the gap between pulses must be long enough for any delay required between the readings.

  Digital output
  ==============

  It must be a regenerative continuous power - see example material entry and exit > DAQmx > digital generation > Cont writing Dig Ext Clock.vi - Port.

  1. the clock source should be set by right-clicking on the source control.  Select i/o filtering name and then check the box advanced terminals.  You can then select him appropriates the in-house production of counters.

  2. you need to set the clock for the front edge.

  3. the entrepreneurs that the buffer with two outputs that we require for example 10 and 01 and then sending a pulse to the clock pass effectively between the two.

  Digital input
  =============

  This should be a task of standard continuous input as in the example of the input and output material > DAQmx > digital measures > Cont read Dig channel-Ext Clk.vi

  1. set up the VI of timing almost identical to the output task.  Same source, but this time on the front clock down.

  2 do with the data you want!

  Overall program
  ===============

  The main consideration is that you should start the meter output last as soon as it runs other can start synchronization of data.

  I hope this helps and is clear enough.  I would like to know if it makes sense or if you would like more information or even no matter what assistance this program construction.

  Kind regards

• How to synchronize the start of IT and relaxation the Scan list (DAQmx Switch)

  Hello

  I want to measure samples of N to the AI0 of Council NI PXI 4461. The measurement starts on a rising edge of a digital triggering provided to the PFI0 of the same Board. The measure is configured with samples of N/2 pretrigged. So far, everything is under control...

  Using an NI PXI 2567 Board, the signal applied at the entrance the 4461 (AI0) switches between a V2 and V1 signal. I would like to synchronize the switch between the two signals with the trigger signal applied to the input of the PFI0 Governing Council 4461. In order to obtain samples of N/2 of V1 and V2 samples N/2. Synchronization of 1 to 5 ms would suffice!

  My question is how to synchronize the start of acquisition of AI pretrigged of 4461 with the switch control given by the Council of 2567?

  Thank you in advance for your help...

  PS: the configuration of the system is:

  -LabView 8.5

  -Chassis PXI-1044

  PXI-4461 on slot 2

  Module 4-slot PXI-2567

  Hi Frederic,.

  I came back to this recently and used the following examples to run the desired synchronization.

  PXI-4461: Acq & graph tension-Int Clk - dig Start & Ref .vi

  Samples per channel = 1000

  Rate (Hz) = 10000.00

  Start the trigger Source = / [name of the instrument DAQmx] / PXI_Trig0

  Onboard start = fall

  Reference Source Trigger = DAQmx Device Name] / PXI_Trig0

  Reference edge = fall

  Trigger samples = Variable (100, 500, 900)

  PXI-2567: Switch Scaning-SW Trigger.vi

  Advance the output terminal full = / [name of the instrument DAQmx] / PXI_Trig0

  Scan list = / [name of the instrument DAQmx] / ch0-> com0.

  Scan list = / [name of the instrument DAQmx] / ch1-> com1;

  Hardware configuration:

  The PXI-2567 module controls an external relay that switches between the voltage of 5 V on ch0 and ch1 0 V.

  The PXI-4461 connects to the COM of the external relay and therefore reads 5V when ch0 is connected; 0 v when ch1 is connected.

  Procedure: The above examples are used in the following procedure.

  1. run the PXI-4461 VI.  A start trigger (falling edge) is necessary to start collecting samples before firing.

  2. launch the module, PXI - 2567 VI.  When ch0 is initially (and immediately) on com0, a trigger is sent to PXI_Trig0.  The PXI-4461 will begin to acquire samples before firing.

  3. - click on the "Connect to the next" button on the front of the PXI - 2567 VI module.  This sends a trigger to entry software for the PXI-2567 module and the transitions of the scan for ch1-> com1 list.  Once the PXI-2567 module remains (debounced), advanced complete relaxation is sent on PXI_Trig0 for the PXI-4461.  The PXI-4461 will begin to acquire samples after outbreak.

  Note: Instead of the trigger of the software entry, an external input trigger can be used (e.g. PXI_Trig1).

  Results:

  > Before instant release of samples = 100

  Delay is caused by the time of actuation of external relay.

  

  > Before instant release of samples = 500

  Delay is caused by the time of actuation of external relay.

  

  > Before instant release of samples = 900

  Delay is caused by the time of actuation of external relay.

  

  I hope that the attached screws and the explanation above helps you and/or other customers who have this problem.

  Best regards

  Chad Erickson

  Switch Product Support Engineer

  NOR - USA

• With a sampling of the data with DAQMX, error-200279 occurs when making 2d array dbl

  Hello

  I did a system of simple analog voltage with DAQMX data acquisition.

  It is made for reading of capacitance, where output capacitance value out of a circuit in the periodic voltage signal.

  What I want is to get data from four capacitors simultaneously through four channels, using samples n n (dbl 2d).

  The structure of my VI is almost similar with examples of continuous sampling of voltage in LabView, with the exception of a few other calculations in the loop.

  And for the synchronization of the trigger, I've corrected the edge of release with the external signal from the capacitance reading circuit.

  Version no. 1 has a channel for data input voltage. Version n ° 2 has four channels for the input data.

  While ver.1 can get accurate reading of four capacitors circuit data each (a single channel at a time),.

  ver.2 acquires four channels of data, with a single thin data channel, all the others were wrong.

  I saw a 200279 error occur in the DAQMX read part 2d dbl, so I tried increasing the buffers by changing the sampling frequency or the number of samples, but it wasn't everything.

  I rose for most of the forums with the 200279 error, but the solution would not work on mine.

  Anyone can find the problem? I will attach my screws it may include a bit of Korean language, but most of them are in English, shouldn't be too hard to recognize. Sorry for the inconvenience.

  Oh I forgot, my DAQ is NI USB-6259, and it works in Win XP sp3 and LabView 8.6.

  Thank you.

  Hello Azurenight,

  The 6259 is a DAQ card of the M Series Multiplexed, which means that it is not possible to sample each signal at the same instant, rather the channels are all sent through the ADC even and must be sampled in order. More information on this can be found here:

  LabVIEW Help: Multiplexing compared with simultaneous sampling

  http://zone.NI.com/reference/en-XX/help/370466W-01/mxcncpts/multisimulsamp/

  It may still be possible to get the data you need with the card you have - could you give more information about the maximum eligible period between samples on different channels?

  If you require * real * simultaneous sampling, you will probably need different hardware.

  Kind regards

• What is READ the array returned by the DAQmx meter? How can I know the two functions DAQmx READ data stream in the same WHILE loop?

  I have a question about the order of execution.  In the WHILE loop, I have two things to measure, period and tension using the DAQmx READ functions for voltage and the meter.  In the end, I want to collect these data as points almost simultaneously as possible, as a pair and then send them together to another piece of code (not shown here) which them will result in some sort of command for an engine.  It would be run, and then I want to perceive the tension and the period at a time later and do the same thing.

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  2.) Will this WHILE loop execute as it gathers tension and a "period table ' (remains to be understood by me) by TIME running in a loop?  In particular, we want that the value of the tension associated with the value of the AVERAGE of the period "array", so we can use two data items to create orders of next control every time that the two values are reported.  The structure for the delivery of vi will be attached data in pairs like this?  I understand that one of the READING functions run not before the other function of READING in the WHILE loop.  I want that the period "means" and "strain (Volt) collected at the same pace. This vi will he?

  Thank you

  Dave

  Hi David,

  I suggest including the DAQmx Start Task function. If it does not start before the loop, it starts the loop and work very well, but it is not as fast and efficient. In the model of task status, task wiill go to run the checked each iteration of the loop and then back the time checked running when it restarts.

  The status of the task model: http://zone.ni.com/reference/en-XX/help/370466V-01/mxcncpts/taskstatemodel/

  Kind regards

  Jason D

  Technical sales engineer

  National Instruments

• Slow loop with DAQmx read

  Hello

  I'm reading 8 channels at once using the NI9213 and DAQmx (see attached image). With this configuration, the loop takes ~ 500ms each iteration. What can I do to improve this?

  Thank you

  JP

  You have not coded anywhere, anytime, so it runs at default speeds.  Look at the examples DAQmx as Thermocouple - continuous Input.vi.  Your module even has a mode high speed, that you can use for a very fast acquisition.  Read the manual.

  BTW, the wires DO NOT your mistake byte of WILL in the end to end eventually.  Always connect them so you can control the errors during debugging.

• Repeating the trigger with Start.Retriggerable

  I have a DAQ PCI-6259 (M-series card) card I am programming with DAQmx. I would like to know if there is a limit in terms of how close together you can use Extensible triggers. I intend to use a frequency of internal clock to 1us. An asynchronous external TTL signal will be used to trigger a finite sequence of digital output of the 6259. The finished digital sequence is 4 samples of long, so it will take 4us. The edges of the asynchronous trigger will happen on every 100us. I intend to use the property Start.Retriggerable = TRUE trigger so that I can repeat this generation 4 sample every time the external TTL signal is received.

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  Is it possible to know if my card PCI-6259 even supports the property trigger Start.Retriggerable?

  100 US will be very well (time to rearm is the order of a tick or two, 10 timebase s ~ ns).

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      long t0, t1;
      long waittime = 5000;
      BufferedReader reader;
  
      public synchronized void connectCommPort() {
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                  sock = new Socket();
                  InetSocketAddress endpoint = new InetSocketAddress(IPaddress, commPort);
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                  commportconnected = true;
                  errorstatus = false;
  
              } catch (IOException ex) {
                  logwriter("LabV: WARNING - network connection to Labview command port failed."+ex.toString());
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                  try {
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                  } catch (Exception ex) {
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                  }
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      }
  
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          String message = null;
          t0 = System.currentTimeMillis();
          t1 = System.currentTimeMillis();
          boolean donereading = false;
          while ((t1 - t0) < (waittime) & donereading != true) {
              t1 = System.currentTimeMillis();
              try {
  
                  while (reader.ready()) {
                      message = reader.readLine();
                      logwriter("LabV: [received] " + message);
                      if (message.contains(".")) {
                          potvalue = Float.parseFloat(message);
                      }
                      donereading = true;
                  }  // close reader-ready-while
              } catch (Exception ex) {
                  System.err.println("Exeption in potlistener() "+ex.getLocalizedMessage());
              }
          } // close timeout while loop
  
          return potvalue;
      }

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  Here's what I thought, something like:

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                  message = reader.readLine();
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                      potvalue = Float.parseFloat(message);
                      donereading = true;
                  }
              } catch (Exception ex) {
                  System.err.println("Exeption in potlistener() "+ex.getLocalizedMessage());
              }
          } // close timeout while loop

  (a) No, but I would look into the configuration of the network itself rather than the Java code.

  (b) the correct way to enforce a timeout of read is through Socket.setSoTimeout ().

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