Level of measurement OR-USB-6001 nosie

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• 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

• Simultaneous to the AO and HAVE with the acquisition of data NOR USB 6001/MATLAB Toolbox

  I am very new to data acquisition and bought a NI USB 6001 to start to learn. Because I can get free MATLAB through my University, I use Matlab data acquisition Toolkit as the data acquisition software.

  My problem is that I get the following error message when I try to generate an AO (an LED voltage) signal and measure a signal I (voltage of a battery of 9V) simultaneously.

  ATTENTION: This change is caused in the dump output data queue.  Use queueOutputData for the queue data before the start of the object.
  Hardware does not support the specified connection. Check the user manual of the device for the valid device routes and pinout.

  However to measure IA or by generating the AO each by themselves works perfectly well.

  My Matlab script looks like this:

  daq.getDevices;

  s = DAQ.createSession ('or');

  s.Rate = 1000;

  s.DurationInSeconds = 10;

  addAnalogInputChannel (s, 'Dev1', 'ai0', 'Voltage');

  addAnalogOutputChannel (s, 'Dev1', 'ao0', 'Voltage');

  aoVoltage = 1.8 + 0.1 * sin (linspace (0, 2 * pi, 10000))';

  queueOutputData (s, aoVoltage);

  s

  startBackground (s);

  Note that adding the channels HAVE and AO at the session also works, however I get the error mentioned at the start of the session. This is a limitation of my data acquisition hardware (I don't see something like that mentioned in the manual) or do I have to modify the script?

  The pins connected for the LED are AO0 (+) and AO GND (-).

  The pins connected to the battery are AI0 (+) and (-) AI4. (The problem is still there if I use the reference to the ground for AI)

  6001 cannot make simultaneous tasks.  Very standard limitation of the low-end hardware... just don't have on board computing resources to handle such things.  Even the 621 x boards have only limited multitasking abilities.

  Can intensify to a high range data acquisition ($$$) or buy a 2nd a low end and synchronize tasks in software (not as precise calendar).  I've done two approaches, one is "best" really depends on demand... If low-cost or high-performance is a priority.

• entry digital usb 6001 of nor

  I am trying to simulate a signal digital 72Hz to an external circuit. Attached below is the pattern that I use. I had to initially waveform graph to view the signal, but data types are different, so I ended up using a waveform digital chart vi. Once I run the simulation, nothing in the graph. Help, please. I use a hardware DAQ USB 6001.

  BTW, I tried to create a task in the DAQ Assistant, but succeeds only when the acquisition mode has been set to 1 sample (on request). When you do what I wanted, which was a continuous sampling, an error has occurred.

  Error-200077

  Requested value is not a vaalue supported for this property. The value of the property may be invalid because it is in conflict with another property.

  Property: SampTimingType

  Requested value: sample clock

  Possible values: on request

  Basically, what I want is to see the place in the graph of the signal waveform and perform a signal processing.

  Too bad. I already solved the problem. I used to analog rather than digital input

• for control voltage can we use usb-6001?

  where can I find the usb-6001 software and driver?

  You can certainly use a 6001 to control the tension... in line with the specifications of the device.

  Driver belongs to DAQmx, available here: http://www.ni.com/download/ni-daqmx-14.1/4953/en/

• Voltage of e/s-USB-6001

  Hello world

  The USB-6001 reference manual says on page 9 that I/O voltage is 5V.

  I think use to test a PCB where the microcontroller is powered from 3.3Vdc so the question is, first, is it possible to connect the I/O entrance to 3v3 rather 5Vdc os?

  Thank you and best regards

  The 5 v PIN is an output. The 6001 is powered by the USB interface.

• More and more common digital output on USB-6001 with ULN2003A

  I am ordering an engine step by step and the current required on the digital inputs of the stepper driver is close to 11mA (at 5V).  My USB-6001 is not capable of producing this high current.  I've seen people using the ULN2003A to control relay and it looks like it should work for my application.  It will work and then I use the 5V output to go to the ULN2003A because it can produce for a 150mA.  To associate the ULN2003A I use the 5V output and put the positive on the COM?

  As you drew it should be fine. Do not connect data acquisition + 5 V because the controller inputs are opto-isolated. That circuit is also compatible with the 11 current requirement my mentioned in your first post.

  USB-6001 digital lines are software timed so your maximum stage rates will be very high.

  Lynn

• ContGenVoltageWfm_ExtClk-USB-6001

  Hi all

  I just got USB-6001 and tried to go although the demo examples. The question is about the "ContGenVoltageWfm_ExtClk". To after my understanding, there should be no signal AO while no pulse train provided the sample clock source defined (/ PFI0). However, AO signal is always generated as if it is running an internal integrated clock. I use Examples\DotNET4.5.1. Support for USB-6001 external clock example? Any help will be appreciated. Thank you.

  Hello

  The Specification 6001 OR don't mention external trigger. To compare with another product, here's the Specifications NI USB-6211. On page 9, there is an external digital triggersection. for the analog output function, PFI can be used as Trigger Start, relaxing break, sample clock or time Base clock sample.

  This let me think that the external clock for analog output is not supported by NI 6001. Check if for example there are a list of supported hardware.

  Best regards

• What is the first version of labview can be used with a USB-6001

  What is the first version of Labview, which can be used with a USB-6001?

  According to the user's Guide, you must DAQmx 9.9 or later version.  The oldest version of support DAQmx 9.9 is LabVIEW 2010 (DAQmx and LabVIEW version compatibility).

• USB-6001 and LabVIEW 6.1

  I'm working on a project with LabVIEW 6.1.

  They just bought a NI USB-6001.

  I installed the driver NOR-DAQmx 9.9 and the device comes in OR-MAX and I am able to use the Test panels to read and put pins.

  In LabVIEW 6.1, the device does not appear.

  What should I do to be able to program this device with LabVIEW 6.1?

  You need tasks in order to use the DAQmx Read and Write DAQmx.  You can create tasks in MAX or do it programmatically with the available in the palette DAQmx screws.

• USB-6001 and linux

  Hi all

  I have a NI USB-6001 DAQ device that I'm doing work on linux. My distro is opensuse 13.1, and I am using nor-daqmx base 14 to talk to the device. After much bother that I have finally made was get the drivers installed, however I am not having any chance to communicate with the device. The output of dmesg shows that the device is connected and recognized, however the output of lsdaq does not list the device at all as you can see below.
  For the device user's guide suggests that it is supported by NEITHER-DAQmx 9.9 and later it is true that the doc is written from the point of view centered on mswindows, so I
  hope that this applies also for linux.

  If someone managed to get this device working under linux? If not, can anyone think why it is not detected?

  Thanks for any help

  > dmesg
  ...
  [1,605963] usb 3-14: new USB full speed number 4 from the device using xhci_hcd
  [1,617849] usb 3-14: new USB drive found, idVendor = 3923, idProduct = 76bf
  [1,617851] usb 3-14: new USB device strings: Mfr = 1, product = 2, SerialNumber = 3
  [1,617852] usb 3-14: product: USB-6001
  [1,617853] usb 3-14: manufacturer: National Instruments
  ...

  > lsdaq
  --------------------------------
  Detect of National Instruments DAQ devices
  Find the following materials:
  --------------------------------

  > uname - r
  3.11.10 - 25-Desktop

  > lsmod | grep ^ or
  663726 1 nimxdfk
  322143 1 nipxirmk
  441753 2 nipxirmk nidimk
  3 524901 nimxdfk nimdbgk, nipxirmk
  4 141747 nimxdfk niorbk, nipxirmk, nidimk, nimdbgk
  nipalk 1193476 8 NiViPciK, nimxdfk, nipxirmk, nidimk, nimdbgk, niorbk
  Nation 113161 6 nimxdfk, nipxirmk, nidimk, nimdbgk, niorbk, nipalk

  It is not listed in the Readme as being supported.

• I can measure analog USB supply voltage using Labview?

  I'm basically feeding a (nominal) 5V USB power sensor, but the output of full scale depends on the real for a particular measure input voltage - what I want to do is to get labview to measure the voltage at the USB port at the same time it samples the voltage of the output sensor and then that of full scale output for that instant in time can be calculated and thus give a measure more accurate. Is this possible in labview? Thank you very much.

  Haydn Barker

  Makes a lot of sense, actually - probably would see a few mV dropped from the point of measurement of the sensor point... then you work with equations/remedies just to work with an inaccurate level anyway. Okay well I'll write that off as a bad idea then and just stick to the system, because it isn't now - I don't know that it will be enough. Thank you for your answers and help.

• Is DAQ Measurement Computing USB - 1608FS compatible with labview?

  I have DAQ USB-1608FS from Measurement Computing company, and I was trying to see if it is possible to use

  This data acquisition with labview 2012. I tried to download the drivers from their company http://www.mccdaq.com/usb-data-acquisition/USB-1608FS.aspx

  but when I tried to use labview in the DAQmx the DAQ tool is not detect it by LabView. So, if anybody out there knows if this data acquisition

  really can work with labview, please let me know.

  Their driver seems to be ULx http://www.mccdaq.com/daq-software/universal-library-extensions-lv.aspx

  and he said that he supports LabVIEW 2012. I suppose you open a sample and the device does not appear? The device is displayed in the Windows Device Manager? It seems that this driver/device will work, there may be just a few questions it initialize properly on your machine (either with Windows or Measurement Computing software). You must be to open a debate on their forums or call their support help line.

  Good luck! Let us know some of the above and, of course, let us know if find you the solution.

  -gavin

• period measurement Semi USB 6221

  Hi guys,.

  I have a problem measuring the period of semi of a digital signal. I'm gernerating a pulse with my USB 6221 DAQ board and I use the counter 0 (9 PFI) for the period of semi. But I don't get all the values. Also, I tried to generate a signal of pluse using the 1 meter and measured the period using counter 0 and it worked perfectly fine. Take a look at the code can be I am doing something wrong.

  found the problem. I was reading more samples then I sent.

  

• Development of oscilloscope with NI USB 6001

  Hello

  IM planning to develop a virtual oscillpocope with Labwindows/CVI for my University project. I was wondering if its necessary to use the CVI real-time or not? I heavent much experience with CVI and this will be my first project, so if you have any advice that would be great. And also perhaps any similar project developed until I could take a look?

  Thank you

  Cards DAQ have deep pads. Looking just at intervals predefined. Use the callback function timer assync that it is precise to couple of Ms resolution.