USB-6211 w / DAQmx

Similar Questions

• Digital magnification of output using USB-6211

  Hello

  I'm trying to use the example of LV "Cont writing dig port - Int clk.vi" to generate a model.

  But I get the error-200077 on the sample clock. The popup error message suggests

  using "we demand", but it doesn't have the choice with the DAQmx.

  Any clue?  Thank you.

  It is correct. USB-6211 case doesn't have a digital time - analog base only. That's why the (63xx) X series cards are supported only for this example.

• USB-6211 - digital output not supported?

  Hi all

  I can't use the USB6211 device port... I use daqmx with Delphi7 API functions.

  First of all, I tried this:

  DAQmxCreateTask('', @TaskDO);
  DAQmxCreateDOChan (TaskDO, PChar('Dev1/port0'), ", DAQmx_Val_ChanForAllLines);
  DAQmxWriteDigitalU8 (TaskDO, 1, 1, 1, DAQmx_Val_GroupByChannel, $FF, @written, nil);

  I had an error in the DAQmxWriteDigitalU8:-200012 (= digital output not supported). (???)

  OK, I tried to disable autostart option based on DAQmxWriteDigitalU8 and insert a 'manual' start in the code:

  DAQmxCreateTask('', @TaskDO);
  DAQmxCreateDOChan (TaskDO, PChar('Dev1/port0'), ", DAQmx_Val_ChanForAllLines);
  DAQmxStartTask (TaskDO);
  DAQmxWriteDigitalU8 (TaskDO, 1, 0, 1, DAQmx_Val_GroupByChannel, $FF, @written, nil);
  DAQmxStopTask (TaskDO);

  Now, I got the same error in DAQmxStartTask:-200012 (Digital Output not supported, once again). (?????)

  I don't understand.. 'Digital output not supported "? USB-6211 has 4 lines! What is the problem?

  I want to just turn on and off the lines from code...

  -Cs George-

  Well, finally I figured out...

  Here is the solution:

  DAQmxCreateTask('', @TaskDO);
  DAQmxCreateDOChan (TaskDO, PChar('Dev1/port1'), ", DAQmx_Val_ChanForAllLines);
  DAQmxWriteDigitalU8 (TaskDO, 1, @dummy, 1, DAQmx_Val_GroupByChannel, @bitmask, @written, nil);

  Digital output lines are on port1! Corrected parameter.
  And the part of the interface of DAQmxWriteDigitalU8 had to be changed (in nidaqmx.pas).
  I don't know why, but the AutoStart (dummy) parameter in the DAQmxWriteDigitalU8 function is ignored: function always starts task automatically, regardless of the value of autostart. But this isn't a problem for me.

  -Cs George-

• USB 6211 measuring range

  Hello

  I am curious about the measuring range of the DAQ USB 6211 box, and specifically how it is defined. In the manual for the device, an array of ranges of input supported is listed here http://www.ni.com/pdf/manuals/371932f.pdf containing the same information to be redone in full UNAMA in article 4-3; However, in MAX and Labview configuration entry is completely arbitrary! In other words, I can whatever values I want to finish up and ranges of minimum entry as long as they are not superior to 10V. Of course, I'm a bit skeptical that this variable configuration continuously on the software side causes sensitive side material changes. My questions are: should I stay an of these ranges of measurement? Happening actually on the material side when I put the input range to something other than one of the recommended ranges of entry? If I put +/-250 mV, is still sensitive in the output?

  Thank you for your time and help,

  Matthew Berwind

  The DAQmx driver accept all values in the range, but will check against the specified material and gives an error, a warning, or just simply adapt to a next higher range that match.

  So after a configuration, you can use the property node or the DAQmx vi to read the chosen effective range by the driver.

• AI data seem to be fallen on the NI USB-6211 case

  Hi all

  It seems that, after a thorough inspection, I am having some problems with a DAQ USB (USB-6211).  I try to read and to capture a series of samples to a fixed dt for a fixed rate (i.e. 50 ksps / s to 50 kHz for 1 s).  At every point I have retrieve the data (using the vi DAQmx Read), I add the (recovered as a waveform) data to all previously retrieved data (using the vi Append waveform).  After that I captured my 50 kS, I then ship the data off the coast in a queue for processing in the frequency domain using one of the FFT routines. Pretty easy, right?   However, according to what is happening on the desktop, it seems that the data acquisition time can vary at least +/-20 we tell me that some of the sampled data may have been deleted (if only a few samples) and is irregularly spaced out in time.  It is a problem like falling none of the data is likely to skew the results in the frequency domain.

  If you have a thought, please let me know.

  Thanks, Matt

  Thanks for the timely response, kikiduu and I apologize for the delay in responding.  It turns out that I've implemented my evil FFT and it was question thereal I deal with.  Briefly, I was generating a tophat in the shape of signal in the frequency domain, and then using the IDFT to convert the singal to a time field that could be sent to the DAC.  When I got the signal that I had generated, depended on the result of the where the AO signal was sampled.  The simple answer to why it happened was with the windowing feature that I used.

  However, as you pointed out, my use of the DAQmx Read and add waveforms is unnecessary and causes data drops that I demanded a fixed number of samples each time.  I have since implemented the reading as you suggested and everything works perfectly (and uses a lot less time CPU).  Thanks for the comments.

  Cheers, Matt

• Code C++ for USB-6211

  Hello

  I was wondering if the code examples provide with the DAQm base driver software, written in C, is fully compatible with C++.

  I'm trying to develop my own C++ program, that will record the tensions of 3 different sources using the box USB-6211.

  Hello burned,

  I know a lot of code written in C can be compiled in C++, but I can't promise that the DAQmx Base code written in C will work.  Have you tried to compile an example of C in C++, and if so, did that work for you at all?

  Kind regards

• Data acquisition high speed (200 ksps / s) with pci-6224 or usb-6211 is possible?

  Hello

  I need assistance to complete a task.

  The task:

  Record a switch contacts twists every 5 microseconds (200 ksps / s).  DAQ cards I have at my disposal at the present time are PCI-6224 and the USB-6211. The two cards are rated up to 250 kech. / s. I only watch 1 channel that will monitor the voltage.

  Here are the settings I use:

  CSR

  Continuous samples

  Sampling rate of 200 kech. / s

  Analog DBL1 1 sam chan

  timeout of 10 seconds (Read DAQmx)

  The problem:

  (1) every time I try to taste 200 kech. / s I get an error that reads

  Measurements: Tried to read samples that are no longer available. The requested sample was already available, but has since been replaced.

  Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

  (2) when you try to taste at a much slower pace of 50 kech. / s, the speed of the loop iteration is not realizing this speed setting.

  My question is this: are these 2 cards (PCI-6224 or USB-6211) DAQ fast enough at my request and I do something wrong? OR

  I use the wrong hardware to accomplish my task?

  Thank you in advance,

  Gerardo

  The number of iterations has nothing to do with the number of samples if you do it right. You specify the rate and the number of samples you want and number of samples returned. You DO NOT loop 200,000 times. If you ask for 200 000 s/s and 200,000 samples, you will get this number of samples every second. It's really as simple as that.

• USB-6211

  Hi, recently, I ordered the DAQ USB 6211, I wonder how do I connect a quadrature encoder to the DAQ meter, I would like to only use a single meter, pin 1-4, my encoder has two channels only, CH A and CH B.

  Best regards;
  Jamal

  Hi jm56789.

  I think that the information you are looking for is located on Via MAX (Measurement and Automation Explorer) by creating a task of angular Position for your device.

  The default screen that should come has the Configuration tab selected.  In the middle of this component, there is a box that lists the "connections".  In my case, it says channel should be on PFI0 and canel B on PFI1.

  I hope this helps.

  Michael G

• OR USB-6211 is used to count climbing on board TTL

  Hello

  I'm new to NOR-DAQ cards, and so before buying whatever it is would like to know if it is possible to use a device, NI USB-6211

  County and bin amounting to edges of a TTL signal.

  What I want to do is to count how many rising edges of a TTL signal I get in a period of 1 ms; a 20 Mhz sampling frequency should be fine.

  I would like to use Matlab to control and read the number of edges that are counted as well as in the meantime write and read digital IO ports from the USB-6211.

  Is it maybe possible to leave the external TTL signal trigger a 6211 counters, an output then periodically (1 ms) and reset the value of the counter?

  Is it possible and if yes, is it a good idea?

  Thanks and regards,

  Manual

  Manual Hi

  In order to generate this signal, I could use a second timer mode continuous pulse Train generation, right?

  -> Right. You can choose between 2 options

  (1) get the signal to another device, for example signal generator or something like that. If you cannot use such a device, you must select the second solution->

  (2) generate the 1ms period square wave with the meter of the USB-6211 seconds

  I don't know a smart way to generate the 1ms period signal without the software side. You need the software to configure the second counter, route the signal to the second counter for the first counter and so on.

  Maybe you can use what is called "panel test" inside the Explorer Measurment & Automation to generate signal. The Measurment & Automation Explorer is a tool provided with the driver for the DAQ cards. The original purpose of this software utility is to configure your hardware, test and so on.

  I don't know if it works, but I imagine that the following solution:

  You use the test panel called inside the Measurment & Automation Explorer to generate the 1ms period signal (see attached screenshot and http://www.ni.com/white-paper/4638/en). You have no additional program to run the test Panel. Box USB-6211, you use a wire to connect the signal output of the meter of second at the entrance to the first counter. After that, you run Control Panel to test the generation of signals for the seconds counter. At the same time, you start your Matlab program and configure only the first counter. You will need to run the Testpanel all the time if you want to run your measurment.

  Not very nice, but maybe the only solution.

  Best regards, Stephan

• How I ouptut a digital waveform, it has collated and compare it to the original with a usb-6211 box?

  I want a digital waveform to a circuit of output, read the return signal and compare the original to the read signal. I use a usb-6211 housing is it possible and if so, how?

  Use a comparator "equals sign", mark the post as a solution if you have the makings of what you wanted.

• Bad first USB 6211 data samples

  I work with the USB-6211 and Signal explicit, and for one of my sensors that I will receive entry incorrect for each sampling period. My sample rates and capture rates is at 44 kHz. The first attachment shows the first few samples each period. At the beginning of each sample is the same as the image below, and this only happens on my device of the accelerometer. My other devices do not exhibit this behavior.

  You see, this is explained in your chart title:

  FILTERED entry

  It is an artifact of conventional filter (the step response of the filter you use coarsly)

  You can try to reduce it by mirroring the first ms (?) of data, but usually you just capture some data more and cut.

• USB-6211 noise problem

  Hello
  I use an NI USB-6211 device, Windows XP, and I have the problem of blood (photo attached).

  My analog differential signal (signal DC to DC power supply) is connected to an analog input in box usb-6211 (AI1 and AI9 ports).

  The signal I get is evolving between 0V the Volt of entry (in the attached photo - 4V) instead of 4 v DC.

  It might be a good idea to test it with a 9V battery using a differential connection with wiring configuration described in the manual (photo and link below). I know it sounds Basic, but re-seats black connector of i/o to the device might help. Make sure you reference GND AI as well.

  

  http://www.NI.com/PDF/manuals/371931f.PDF

• Lack of charges, USB-6211 with linear gauge Mitutoyo (542 series)

  I use a USB-6211 box with a race of 10mm Mitutoyo Linear Gage (542 series, model LGA-110). The Mitutoyo has output similar to an encoder without the time by rev signal quadrature. (B has a phase shift of 90 degrees of A). Signals A and B are airline pilots. I have a k 2 5V to A resistance and another 2K to 5V to B, gives me a minimum of 0.05v and a maximum of 4.75V.

  The problem I encounter is that I seem to be missing certain counts that I can't always zero.

  I found that if I caress the complete range of meter and the return to zero in 20 seconds, I get a value close to 180 meter microphone. If I press the complete range of meter and the return to zero quickly in a second, I get a value close to 800 micrometer.

  If I caress the quick pledge on the compression and rebound more slowly, I find myself with a positive value. I caress the slow pledge on compression and quick on the rebound, I find myself with a negative value.

  As I said before, it seems miss me certain counts. With a pulse of each mic of 4 meters, it means I get only 2500 pulses per 10mm. This means that 10mm per second is only 2500 pulses per second. It seems slow for me, so I don't know what would be the problem.

  Does anyone have ideas for me to try?

  With this type of signal you should not missing any counts.  The time base on the box USB-6211 is 80 Mhz and therefore should have no problem to solve your two pulses per train.  I have a couple of steps that I would like you to try troubleshooting.

  1 to ensure that we plugged the inputs correctly to our DAQ hardware.

  2 ensures that we use both the non-reversed or two signals reversed.  Do NOT mix or 'type' of the signal.

  3 allows you to wire signals A and B in two inputs analog and we will try to read signals to ensure that the sensor is actually be set correctly by the sensor.  Be sure to taste pretty quickly--> 10 the frequency of the pulse train.  If you race through 10 mm in 1 sec--> 2500 pulses per second--> 25 kHz sampling rate.   Allows to check two things.  First we have a good TTL signals, and that we get the right number of charges.  If you reply to this thread plaese attach a screenshot of the present.

  4. we will try different encoder types x 1, x 2, x 4 in the DAQ assistant.  The x 2 and x 4 encoder allows the best sensitivity for small movements (which I'm not sure that it is the source of your proplem but it will be a good thing to check).  Types of encoder are discussed in more detail in the following developer area: quadrature encoder measures: How To?

  Let us know how it shapes to the top.

• PWM - output meter (PFI4) USB-6211

  I managed to control a motor based on PWM signal output via USB-6211 AO continuous. Now, I'm trying to use the Terminal counter instead.

  Can't seem to make it work. NA not get a signal when link the PFI4 terminal to an oscilloscope.

  I don't know wheather my coding is wrong or does not have my wiring (i.e. of USB-6211 for motor continuous). I need to use the terminal of meter that I used the analog output to a different measure.

  Please advice. Attached encodings.

  Thank you very much.

  Front of conneting to DC motor, make sure first that the PWM is get generated correctly... use oscilloscope.

  And have you changed the constant (physical terminals) for your device...?

  

  Change to:

  Dev1/ctr0 & Dev1/PFI4 and the scheme of connection must be:

  

• The PCIe for USB 6211 OEM replacement

  Hi you all,.

  We want to change our design to use PCIe card data acquisition, since we had a few USB driver problem in the past. Is the PCIe-6321 a good match to replace the capture USB-6211-OEM card

  Is there a better alternative?

  Thank you

  Fabrice

  Hello Fabrizio,

  Thank you for taking an interest in our line of PCIe cards DAQ. I took a glance at the USB-6211 OEM and PCIe-6321 to see if they are similar in specifications and capabilities. I would say the 6321 is a good match to replace your current USB card. As long as you intend to use no more i/o lines than expected or exceeds the designated sampling rate then it should be a good substitute.

  If you need high speed sampling or more i/o lines for various tasks, then another card can better meet your needs.

  The resources below compares several of our devices (USB and PCIe) X series.

  What is NI X Series? -1. Presentation of the product

  ---

  These links may also be useful during your upgrade:

  Major differences between series E, series M and material X NI DAQ series

  ---

  Guide to upgrade NI X series (USB to USB devices however)

  ---

  Kind regards
  Alex C.