With the help of the cDAQ timers to repeat an impulse of finite samples clocked by train clock material

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• buffer size and sync with the cDAQ 9188 problems and Visual Basic

  Hi all, I have a cDAQ-9188 with 9235 for quarter bridge straing caliber acquisition module.

  I would appreciate help to understand how synchronization and buffer.

  I do not use LabView: I'm developing in Visual Basic, Visual Studio 2010.

  I developed my app of the NI AcqStrainSample example. What I found in the order is:

  -CreateStrainGageChannel

  -ConfigureSampleClock

  -create an AnalogMultiChannelReader

  and

  -Start the task

  There is a timer in the VB application, once the task begun, that triggers the playback feature. This function uses:

  -AnalogMultiChannelReader.ReadWaveform (- 1).

  I have no problem with CreateStrainGageChannel, I put 8 channels and other settings.

  Regarding the ConfigureSampleClock, I have some doubts. I want a continuous acquisition, then I put the internal rate, signal source 1000, continuous sample mode, I set the size buffer using the parameter "sampled by channel.

  What I wonder is:

  (1) can I put any kind of buffer size? That the limited hardware of the module (9235) or DAQ (9188)?

  (2) can I read the buffer, let's say, once per second and read all samples stored in it?

  (3) do I have to implement my own buffer for playback of data acquisition, or it is not necessary?

  (4) because I don't want to lose packets: y at - it a timestamp index or a package, I can use to check for this?

  Thank you very much for the help

  Hi Roberto-

  I will address each of your questions:

  (1) can I put any kind of buffer size? That the limited hardware of the module (9235) or DAQ (9188)?

  The samplesPerChannel parameter has different features according to the synchronization mode, you choose.  If you choose finished samples the parameter samplesPerChannel determines how many sample clocks to generate and also determines the exact size to use.  But if you use streaming samples, the samplesPerChannel and speed settings are used together to determine the size of the buffer, according to this excerpt from the reference help C DAQmx:

  

  Note that this buffer is a buffer software host-side.  There can be no impact on the material available on the cDAQ-9188 or NI 9235 buffers.  These devices each have relatively small equipment pads and their firmware and the Driver NOR-DAQmx driver software transfer data device to automatically host and the most effective way possible.  The buffer on the host side then holds the data until you call DAQmx Read or otherwise the input stream of service.

  (2) can I read the buffer, let's say, once per second and read all samples stored in it?

  Yes.  You would achieve this by choosing a DAQmx Read size equal to the inverse of the sampling frequency (during 1 second data) or a multiple of that of the other playback times.

  (3) do I have to implement my own buffer for playback of data acquisition, or it is not necessary?

  No, you should not need to implement your own stamp.  The DAQmx buffer on the host side will contain the data until you call the DAQmx Read function.  If you want to read from this buffer less frequently you should consider increasing its size to avoid the overflow of this buffer.  Which brings me to your next question...

  (4) because I don't want to lose packets: y at - it a timestamp index or a package, I can use to check for this?

  DAQmx will meet you if all packets are lost.  The default behavior is to stop the flow of data and present an error if the buffer of the side host DAQmx overflows (if, for example, your application does not pick up samples of this buffer at a rate equal or faster than they are acquired, on average).

  If, for any reason, you want to let DAQmx to ignore the conditions of saturation (perhaps, for example, if you want to sample continuously at a high rate but want only interested in retrieving the most recent subset of samples), you can use the DAQmxSetReadOverWrite property and set it to DAQmx_Val_OverwriteUnreadSamps.

  I hope this helps.

• How many quadrature encoders may be read together with the cDAQ-9188 chassis?

  We will record position periodically 8 engines (at the same time as we are to the corresponding samples entered analog).  It seems that the 4 built-in counters limited chassis to 4 encoders.  Is this correct?  I am familiar with modules of counter PLC which manage high-speed counting, and then the CPU posts periodically to update the total values.  This is how the NI 9401 card would work?

  Hi jtrout,

  You are right the 4 built-in counters than the cDAQ-9188 chassis 4 encoders.  The following article deals with the use of the NI 9401 card for encoder measures: http://www.ni.com/tutorial/7109/en/.

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  Hello world.

  I'm testing a material that I just got and I have some problems and questions, if anyone can help that would be great.

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  Hello
  I have a requirement to retrieve data based on a closer effective_date in the past.
  Here are examples of data
  
  Data in the table
  
  DESCRIPTION OF ARTICLE EFFECTIVE_DATE
  ---------------------------------------------------------------------------
  018885237 24 OCTOBER 09 DVD + R 47 10 PK
  DISC OF DVD + R 10 018885237 16 APRIL 10
  
  040706113 FLASH PLAYER 24 OCTOBER 09
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  032140640 26 FEBRUARY 10 8 GB USB
  032140640 24 OCTOBER 09 8 GB FLASH
  
  The power required
  
  DESCRIPTION OF ARTICLE EFFECTIVE_DATE
  ---------------------------------------------------------------------------
  DISC OF DVD + R 10 018885237 16 APRIL 10
  040706113 4 March 10 Micro USB 4 GB
  032140640 26 FEBRUARY 10 8 GB USB
  
  Can someone help me with the SQL please?
  
  Concerning
  Harsha

  SQL> --- generating sample  data:
  SQL> with t as (
    2  select 018885237 item, to_date('24-OCT-09', 'dd-mon-yy') effective_date, 'DVD+R 47 10 PK' description from dual unio
    3  select 018885237, to_date('16-APR-10', 'dd-mon-yy'), 'DVD+R 10 DISC' from dual union
    4  select 040706113, to_date('24-OCT-09', 'dd-mon-yy'), 'FLASH DRIVE' from dual union
    5  select 040706113, to_date('04-MAR-10', 'dd-mon-yy'), '4GB USB Micro' from dual union
    6  select 040706113, to_date('13-JAN-10', 'dd-mon-yy'), 'Flash Driv 4GB' from dual union
    7  select 032140640, to_date('26-FEB-10', 'dd-mon-yy'), '8GB USB' from dual union
    8  select 032140640, to_date('24-OCT-09', 'dd-mon-yy'), '8GB FLASH' from dual
    9  )
   10  --
   11  -- actual query
   12  --
   13  select  item
   14  ,      effective_date
   15  ,      description
   16  from ( select item
   17         ,      effective_date
   18         ,      description
   19         ,      row_number() over (partition by item order by effective_date desc)  rn
   20         from   t
   21       )
   22  where rn=1;
  
        ITEM EFFECTIVE DESCRIPTION
  ---------- --------- --------------
    18885237 16-APR-10 DVD+R 10 DISC
    32140640 26-FEB-10 8GB USB
    40706113 04-MAR-10 4GB USB Micro
  

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