DAQmx: (almost) synchronous Continuous Acquisition / how to trigger Council transfer buffer?

Similar Questions

• How to abort Continuous Acquisition (which is set to acquire a constant number of samples per channel each iteration)?

  Hi all

  I would like to continuously acquire an input channel analog and, if necessary, be able to stop the acquisition as quickly as possible.

  I use a card NI USB-6289. I implemented a DAQmx (voltage) analog input task, set the clock sampling DAQmx 'continuous samples' and the rate required (IE 1000, which is 1 kHz). For the acquisition, I used a while loop with inside the DAQmx Read with Terminal 'number of samples per channel', wired (IE 1000). The while loop waits until 1000 samples are acquired and therefore continuously reads the channel in uniform batches of 1000 samples every second ticking. The while loop can be easily interrupted when the DAQmx has completed the acquisition of the lot being 1000 samples, but it takes the DAQmx finish their current task.

  My problem is how to stop the loop while the DAQmx Read lies in the middle to get 1000 samples WITHOUT delay all 1000 samples are received? Is it possible to interrupt the DAQmx Read?

  I could reduce "the number of samples per second", increasing the responsiveness of the while loop, but this is not the solution I prefer. I tried to destroy the task (outside the while loop), but that does not stop immediately the acquisition, Read DAQmx still finish acquire 1000 samples. I've included an example Subvi. When I was using a PCI card, I used a timed while loop with inside the DAQmx Read with Terminal 'number of samples per channel' wired-1 (= which means ' read everything in the buffer "). In this case, it was easy to stop the acquisition at any time: the timed, while the loop is abandoned and the acquisition has ceased immediately. But it does not work with an NI USB-6289 map (see thread http://forums.ni.com/ni/board/message?board.id=170&message.id=386509&query.id=438879#M386509) because of the different way the data are transferred to the PC.

  Thank you very much for your help!

  Have a great day,

  LucaQ

  Hi LucaQ,

  Your solutions are decrease of the number of samples, or record the time you want to stop and remove samples that have been acquired beyond this time. There is no other way to stop the actual reading out of the hardware store.

  Flash

• LabVIEW statechart module of data acquisition error external trigger

  I have a 2 loop vi is the acquisition of data of a data acquisition instrument loop and the second is a loop to run my statechart of.  I would like to respond to an error in device of acquisition data if it occurs in transition out of my current state in my diagram States-transitions and enable management of custom unique business mistakes.  My States-transitions diagram is synchronous and send it external trigger.vi funciton will not work with it.  How to achieve this?  In addition, there is some confusion about this literature in http://zone.ni.com/reference/en-XX/help/372103F-01/lvscconcepts/sc_c_callervi/ at the bottom of the page it saidNote sending triggers for synchronous charts is optional. If you do send triggers, LabVIEW sends the NULL trigger for transitions. If you send a synchronous statechart triggers, you can send these triggers to the caller VI. »

  Is it possible to do this and if so how with the synchronous statechart?

  Thank you, it should work for me

• Continuous acquisition and synchronization of two scanners

  Hello!

  I use two scanners high-speed NI PXI-5124. I'm running a continuous acquisition as in the attached example. I have two questions:

  (1) is it possible to make life-long using another source of trigger software INSTEAD?

  (2) depending on the answer to the first question - how to synchronize two scanners? In the attached example scanners have the same source of the clock, and they receive the same synchronization synchronization signal so the sampling rates are the same, but there is a lag of random phase each time I start the acquisition.

  Thank you!

  IVA

  Hello, Mateusz!

  I just apply the idea in the examples, as well as ideas from here, and here is the solution that works.

  Thank you!

  IVA

• Error 50103 during continuous acquisition and triggering

  Hi all

  I'm ai0 data acquisition: 3 4 analog inputs (voltage) in continuous mode, display the data (tables and graphs) and data flow to TDMS files in a loop of the consumer.

  The same time, I want to be able to save "time windows" with my purchase. For example, I want to be probe ai1:2 and when the voltage exceeds a certain value, that is to say 0, 5V, I can trigger with analogue reference and get a certain amount of samples (finished samples) after and before (samples before). I am aware of how I can achieve this, an example of NOR is more useful: http://sine.ni.com/devzone/cda/epd/p/id/4840 .

  The problem is this: I don't want to stop the continuous acquisition which is already underway. If I try to start a new task (somehow "copy & paste" the example) that I get, as expected, error-50103, "the specified resource is reserved.

  So, is it possible to accomplish this task without having to fall on reserving resources problem? And if there is not a way could you suggest a way to make this front trigger and trigger sampling?

  Please find enclosed a snapshot of the code. I use a PCI-6254 with two SCB-68.

  Thank you and looking forward for you advice!

  Best regards

  Panos

  Have you seen this?

• How to trigger LR to throw standard previews?

  This is NOT intelligent overviews, but previews of library-module. There is no 1:1 previews, but standard previews.

  Situation: I use an external SSD as 'disk external catalogue', with my LR catalog and previews on it, in order to plug it in 2 different computers that I use also.

  Due to a poorly thought-out import synch-folder that I found myself with side effects and much too many images and previews, so I decided to go back to the last backup good catalog.

  So in theory I should have 100 GB of excess saw the version of catalog scrapped, rendered useless for the restored version of catalog.

  How to trigger LR to throw away them?

  I tried to trigger the generation of standard previews of files, which now contain pictures much less than before, hoping that this would get rid of them. To my astonishment said LR to rebuild almost all previews for the files selected. Why - they should have been here already? Usually, when a version of Catalog backup is restored as current (same name, same clichés), extracts are recognized?

  Once this is completed a night later, I still have the same size of the previews folder catalog!

  Any ideas?

  Before you suggest that I have delete all previews and leave the LR to rebuild from scratch: this is a catalog of 2, 2 GB size, 150'000 images and 190 GB of previews (more than 146 GB of previews smart, although they are not my concern at the moment). This operation will last nearly a week to rebuild... so I would prefer something more simple.

  Thanks, Cornelia

  Hi Cornelia - long time...

  Cornelia - I wrote:

  Do I understand correctly that LR would never get rid of previews, at least I have remove an image in the catalogue

  Yes, you understand properly - the only way to get Lr to remove standard previews is to remove the photo of the catalog (not sure of the part of the cancellation).

  Cornelia - I wrote:

  If the images are already missing the older catalog (through a restore from backup), your PreviewExporter Plugin would find their?

  Well, if the photos have been removed from the catalog, then PreviewExporter will find previews corresponding (there are only glimpses of the selected photos). (if the pictures are in the catalog, but missing disc, then it will find them). Interesting, even if idea - a function to remove all foreign previews - ' twould be easy enough to make, just has not yet done.

  Rob

• Foxfire runs when "Pac Man" plays continuously. How to stop it?

  It started this morning for the first time. He plays when Foxfire is activated, not with IExplorer. Foxfire runs when "Pac Man" plays continuously. How to stop it?

  This has happened

  Each time Firefox opened

  NA

  User Agent

  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.4; .NET CLR 1.0.3705; .NET CLR 1.1.4322;. Media Center PC 4.0; .NET CLR 2.0.50727; WWTClient2 .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

  Removal of CoolPreviews 3.1 seems to have solved my problem.

• How to trigger the dictation from the smart keyboard on the iPad pro.

  I use dictated on my iPhone and my iPad quite often.

  However on my new iPad Pro with the smart keyboard attached, I do not how to trigger the dictation from the keyboard.

  I don't see how to get the soft keyboard back to press the button of the microphone are there, such space suggested by some on this forum.

  This doesn't seem to work in the latest iOS Update 9.

  I would be fine with a hotkey, or have to invoke the keyboard of the shop, then press the button of the microphone, but I don't see how do either.

  When the Emoji button on the keyboard smart strike as the keyboard, the software keyboard emoji is displayed, the space but when I press the soft ABC capital but I cannot get to the regular keyboard with the microphone button.

  A possible alternative would be to use Siri to dictation trigger in recording a memo or another application, space but I didn't understand how to do this job either.

  Has anyone experience this problem and found a solution?

  Unfortunately I had to spend a good hour on the phone with technical support when they finally admit that it was an oversight by Apple.  I hope someone reads this post until they spend countless hours trying to understand something, but has no solution at the moment. Frustrated!

• Have been scanning documents and has reached 999, does not continue. How to be able to scan additional documents

  When scanned documents reached 999 img is unable to continue.  How additional documents can be scanned.  Thanks for any input.  Steve

  Hi Steve,.
  without knowing the details of your system, scanner, or scanner program, it is somewhat difficult to solve the problem.
  Right on the top of my head, there must be a way of compensation/reactivate this number in the scanner software. I would like to seem so your documentation or contact the manufacturer.
  B Eddie

• Apparently, my memory is almost full - no idea how to deal with not having a novice such am - sd card

  Apparently, my memory is almost full - no idea how to deal with not having a novice such am - sd card

  Hi sixty.

  It can also be a good idea to begin to transfer the content from your phone to a PC/Mac to help reduce the storage room.

  It is a process usually easy, just plug the unit to a PC, on the phone screen select MTP mode when it appears.

  Once finished, you just have to access the phone's internal memory and transfer pictures/videos from the DCIM folder.

  Let us know if you need help in this kind of task.

• How to trigger the new numbering of the lines in a group?

  Suppose we have an ORDER_DETAILS table with columns (ORDER_ID, LINE_NUMBER, DESCRIPTION).

  We have these lines:

  order_id, line_number, description

  17: 1, "A".

  17.2, 'G '.

  17.3, 'R '.

  17.4, "Q".

  Next, it inserts a new line

  17.2, 'K '.

  How to trigger the renumbering?

  This should be the result after renumbering.

  17: 1, "A".

  17.2, 'K '.

  17.3, 'G '.

  17.4, 'R '.

  17.5, "Q".

  Then we move the line 5 to line 2.

  How to trigger the renumbering?

  This should be the result after renumbering.

  17: 1, "A".

  17.2, "Q".

  17.3, 'K '.

  17.4, 'G '.

  17.5, 'R '.

  This question is related to another discussion:

  https://forums.Oracle.com/thread/1088303

  create the order_details table

  (number of order_id,

  number of line_number,

  Description varchar2 (30)

  )

  rowdependencies;

  Start

  insert into values order_details (17, 1, 'A');

  insert into values order_details (17.2, 'G');

  insert into values order_details (17.3, 'R');

  insert into values order_details (17.4, 'Q');

  end;

  Select * from order_details by line_number

  ORDER_ID	LINE_NUMBER	DESCRIPTION
  17	1	A
  17	2	G
  17	3	R
  17	4	Q

  create or replace renumber procedure (number p_order_id)

  Start

  Update order_details od

  Set line_number = (select rn

  from (select rowid, RID,)

  / * for autocommit APEX active, etc. * / row_number() on rn (order of line_number, ora_rowscn desc)

  / * for autocommit = OFF favorite above row_number() (line_number order, nulls first ora_rowscn) rn * /.

  of order_details

  where order_id = p_order_id

  )

  where rid = od.rowid

  )

  where order_id = p_order_id;

  end;

  Start

  insert into values order_details (17.2, 'K');

  RENUMBER (17);

  end;

  Select * from order_details by line_number

  ORDER_ID	LINE_NUMBER	DESCRIPTION
  17	1	A
  17	2	K
  17	3	G
  17	4	R
  17	5	Q

  Start

  Update order_details

  Line_number = 2 set

  where order_id = 17

  and line_number = 5;

  RENUMBER (17);

  end;

  Select * from order_details by line_number

  ORDER_ID	LINE_NUMBER	DESCRIPTION
  17	1	A
  17	2	Q
  17	3	K
  17	4	G
  17	5	R

  Concerning

  Etbin

• In fact, I have problem in adding music to be played across all folios, the problem happened when I simply lock the ipad and open it, the publication is always open and I can browse, but the music stops and cann't continue. How can I solve this t

  In fact, I have problem in adding music to be played across all folios, the problem happened when I simply lock the ipad and open it, the publication is always open and I can browse, but the music stops and cann't continue. How can I solve this problem to continue after the opening of the ipad and continue to navigate the digital publication.

  The background sound plays only if the application is open. Once the device is locked or the user switches to another application the audio will stop.

• My basket is empty continue Shopping - how to edit this page?

  My basket is empty continue Shopping - how to edit this page?

  I see that this question has been asked and answered in previous forums, can you plaese show me how to find the answer that I have redirected here?

  Thank you

  Hi Frank,.

  Here is an article that will help you to replace the entire page with a custom from somewhere page on your site http://forums.adobe.com/docs/DOC-2212

  See you soon,.

  Mario

• How to trigger a javascript validation

  I have a form that accepts volunteers information and uses spry fields, it works fine(DW CS4). My users have asked that, in addition to the validation of a field of e-mail to be a valid e-mail address format, they want the user to enter their e-mail address twice and then make sure that both are the same. I must be missing something blinding because I can't understand how to trigger the code js of edition to compare fields two e-mail.

  The page is here www.hollisterairshow.com/volunteerapp3.php

  Here is the js code change that appears in the header section of the page:

  < script type = "text/javascript" >

  If (form1.getElementById('email').value! = form1.getElementById ('email2') .value)

  {

  Alert ('-address Email and confirmation do not match\n');

  Returns false;

  }

  < /script >

  Here is the code for two e-mail fields in the form that appears in the body of the page:

  < b >

  strong e-mail address > < td > < <: facilities > < table >

  < td > < span id = "sprytextfield1" >

  < input name = "email" type = "text" id = "email" / >

  < span class = "textfieldRequiredMsg" > please enter your e-mail address </span > < span class = "textfieldInvalidFormatMsg" > Invalid format. </span > < / span > < table >

  < /tr >

  < b >

  < td > < strong > re-enter E-mail: < facilities > < table >

  < td > < input id = "email2" class = "cat_textbox" name = "email2" maxlength = "255" / > < table >

  < /tr >

  Here is the code for the button 'send '.

  < input type = "submit" name = "submit" id = "submit" value = "Submit" / >

  I know I'm missing something very basic, but I have not the slightest idea of javascript. Thanks in advance.

  Tony

  Nevermind - I fixed it after several hours of fiddling around with javascript. In case someone else has this problem here is what I did:

  I created a js function which compared the two fields and issued an "Alert" message if the fields were different. The function is shown below

  function displayResult()

  {

  var $em1, $em2

  $em1 = document.getElementById("email").value;

  $em2 = document.getElementById("email2").value;

  If ($em1! = $em2)

  {

  Alert (' email address and its confirmation no match\n');

  Returns false;

  }

  }

  In the body of the form, I triggered the function using the event "onblur" as shown below

  E-mail address:

  Please enter your email address Format invalid.

  Re-enter E-mail address:

• ODI: how to trigger the error return prior to loading in Essbase?

  Hi John... If you read my post, I want to say that you impress me! really, thank you for your blog.
  
  Today, my problem is:
  -J' received a poor quality of extract of ERP data file
  -J' saw the reference table (Source == > target)
  -> > How to trigger the error prior to loading in Essbase!
  
  My idea is this, (first of all, I don't know if it's a good thing, and also I have the problem to do in ODI!)
  -Step 1: make the JOIN between data.txt and cross-reference Table == > create a DATA_STEP1 table in the ODISTAGING schema (columns of DATA_STEP1 are adding data.txt columns than the table of cross references (... there more than 20 columns in my case))
  -Step 2: Control if there is no NULL value in the target column (NULL means that the data.txt file contains the value that are not defined in my Table of cross references) by using the filter (filter = Target_Account IS NULL or Target_Entity IS NULL or...)
  The result of this interface is sent to the queue of reject.txt - if reject.txt file is not empty, then a mail is sent to the administrator
  -Step 3: do the opposite: filter NOT (Target_Account IS NULL or Target_Entity IS NULL...) == > the result is sent in the DATA_STEP3 Table
  -Step 4: run correctly mapping: source: DATA_STEP3 (own and verified data!) with reference Tables and send data into Essbase - NORMALLY, it is not rejected record!
  
  My main problem is: what is the right IKM to send data in the DATA_STEP3 Table, which are the Oracle Table in my scheme of ODISTAGING or DATA_STEP1! I tone with Oracle IKM incremental update but I get error and in fact I don't need an update (which is a time trust), I just need an insert!
  "I'm just lookiing for a ' IKM SQL for Oracle...
  concerning
  Xavier

  Create a sequence in oracle, you use the sequence in the mapping of your target.

  < %="odiRef.getObjectName" ("l",="">","","< d="" ou="" w="">") %>.nextval"

  so, for example, it might be

  <%=odiRef.getObjectName("L","DATASEQUENCE","DATALOGICALSCHEMA","D")%>.nextval

  Make sure that you run the mapping target or intermediary.

  See you soon

  John
  http://John-Goodwin.blogspot.com/