How to create analog channels in Labview

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  I'm working on a program to fight the PXI-6509. The only area that I have problems with creates the string by calling the function DAQmxCreateDOChan. I get no errors during the first DAQmxCreateTask, but get an error when you try to create the channel. Exactly how to create the channel name? In MAX, I have named the "DIO" device, do not know if it matters. Any help would be greatly appreciated.

  Hi schelgr,

  Have you had a glance examples DAQmx in finder example found in help > find examples.  In input and output equipment > DAQmx there is a lot of examples that should be able to help with this query.

  Concerning

• How to view analog channels during an ongoing acquisition, what type of used wave form, table, or chart?

  I use Labview 8.5. and the NI USB-6210 device.

  I want to display the analog channels over the continuous acquisition.

  I can use the table of waveform or waveform graph. Waveform allows you to eat a history buffer. This function is very interresting and useful for my system, but I can't change this value to programming (if I do not mistake!). So, I was wondering if I can also use the waveform graph, but I do not have how to make a circular buffer to replace function "history buffer. I have to use the waveform as a data type.

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  Hello...

  Please helpe me for that matter

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  pjr1121 wrote:

  See picture attached.

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• How to create the channel listens for XML/web services line

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  N ° no additional configuration is required to receive files via HTTP. Just ask your TP to post files on one of the below URL.

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• How meter and analog value FIFO synchorize

  I use a card NI 6123.

  Anyone knows how to put 6 analog values and the value of the counter in FIFO with the same rate: 4 k.

  Thus, every second, there should be 6 * 4 k analog values and 4 k in FIFO counter value.

  The problem is:

  1. the counter is a numeric value, so I can't put a sampling on it. So how can I put the value of the counter in the FIFO every second of 1/4000

  2. how to sync analog channels and channel meter.

  -------------------------

  DAQmxErrChk (DAQmxCreateTask("",&datHandler));

  DAQmxErrChk (DAQmxCreateAIVoltageChan(datHandler,"Dev1/ai0:5","",DAQmx_Val_Cfg_Default,-5.0,5.0,DAQmx_Val_Volts,NULL));)

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  DAQmxErrChk (DAQmxCreateTask("",&ctrHandler));

  DAQmxErrChk (DAQmxCreateCICountEdgesChan(ctrHandler,"Dev1/ctr0","",DAQmx_Val_Rising,0,DAQmx_Val_ExtControlled));

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  DAQmxErrChk (DAQmxStartTask (ctrHandler));

  -----------------------------------

  Thank you

  It is possible to apply for a meter in the buffer.  (this is actually preferred).  Simply specify a sampling and source clock.  Given that you want the meter to "lock" data from the meter to the same rate as the sample analog clock to simply specify this sample clock as the sample for the meter clock.

  An example of event in the buffer (life-long) count can be found here by using an external clock (your HAVE sample digital Instruments\NI-DAQ\Examples\MStudioVC2005\Counter\Count Events\CountDigEventsBuffContinuous_ExtClk clock):...\National)

  Check out this example and I think he should get you operational.

• How to use DAQmx Read to measure several analog channels

  I have two analog inputs using USB 6221 and I want to measure the voltage of each of them.  I use vi DAQmx-read and I select input analog, 1 sample, several channels, but I do not know how to connect several channels at the entrance of the physical channel.

  Hello, Bernadette.

  For reference - I would recommend ad DAQmx questions here:

  NEITHER Forums: Multifunction Data Acquisition

  http://forums.NI.com/T5/Multifunction-DAQ/BD-p/250

  There are several ways to add multiple channels for a fast task-ni.com look for "select multiple channels DAQmx" gives me this like the hit albums:

  2X8D7F5Z knowledge base: How can I select more than one channel of NOR-DAQmx LabVIEW?

  http://digital.NI.com/public.nsf/allkb/A3A05920BF915F1486256D210069BE49

  Hope that helps!

• How to write table values to analog channel?

  Hi all

  If I have a table of values, is it possible to write these values as an analog voltage and then stop writing when he arrives at the end of the table? If so, how does do this?

  I have attached my code that generates a table of frequency swept sinusoidal voltages and I write that out to my analog channel, when I consult my output however, I get the same display of sinusoidal repetitive time and time again. I expect for example:

  writing of wave of 1 Hz, 2 Hz, 3 Hz etc...

  but I'm getting the 1 Hz wave over and over again, I selected samples in the sample clock and pretty much done a lot of trial and error and still no luck . Any help would be appreciated!

  Daniel

  Hi Daniel!

  Take a look at this example (you can find examples of LabVIEW):

  Gen CONT tension Wfm - Int Clk - no Regeneration.vi

  Here is an another VI I did (see table). It is slightly different from the example of the LV and it should help you.

  It could be that useful...

  Julien

• How to create a Labview Websocket client?

  Objective: Use WiFi to transfer analog readings of a Yun Arduino to a Labview graphical user interface.

  An Arduino Yun provides Websocket server capabilities and Allied standard used with a browser.   But I did not how to create a Labview Websocket client.  Where my question "how to create a Labview Webcocket customer?

  Howard

  Dennis_Knutson wrote:
  I think you need to better define the arduino interface.

  Dennis - the interface is well defined. WebSocket is a standard (with some variations). It uses the web server, although it does not strictly HTTP connections.

  I don't know of a free LabVIEW websocket client implementation. You might be able to detach the screws LabVIEW of HTTP to retrieve part of the initial connection and the logic of the handshake, but.