Beginning DAQmx and reference trigger

Similar Questions

• How to read from the beginning to reference trigger?

  Hello!

  I develop a system a little on a NI DAQmx 6025 and want to know how can I get data from an early relaxation of reference.

  I use "AcqVoltageSamples_IntClkDigStartAndRef.2008" to control the unit in c#

  If I set up the Starttrigger only, I can trigger... (the measure is to start by climbing aboard PFI0)

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

  myTask.AIChannels.CreateVoltageChannel (physicalChannelComboBox.Text,"", (AITerminalConfiguration)(-1), rangeMin, rangeMax, AIVoltageUnits.Volts ");

  myTask.Timing.ConfigureSampleClock ("", sampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, 1000);

  myTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeStartTriggerEdge.Rising);

  Reader = new AnalogMultiChannelReader (myTask.Stream);

  ...

  drive. SynchronizeCallbacks = true;

  drive. BeginReadWaveform (-1, New AsyncCallback (myCallback), null);

  ... MyCallback...

  data = reader. EndReadWaveform (ar);

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

  Now, I want to stop my measurement by the trigger of the reference, so I set up the Referencetrigger on the same source (PFI0)

  myTask.Triggers.ReferenceTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeReferenceTriggerEdge.Falling, 10);

  (This line is after the configuration StartTrigger)

  If I start the task and give the triggersignal, the measurement starts. But now the measure must stop if I start PFI0 again!

  I don't know what I have to do to become a measure from the beginning to trigger Stop... I mean PFI0 PFI0 rising Edge edge

  Thanks for the support!

  Suchen für alle die noch immer nach einer Antwort, ich habs jetz!

  For all who are looking for this answer, I get it now!

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

  myTask = new Task ("aiTask");        Create a new task
  Initialize local Variables
  Double sampleRate = Convert.ToDouble (rateNumeric.Value);
  Double rangeMin = Convert.ToDouble (minimumValueNumeric.Value);
  rangeMax double = Convert.ToDouble (maximumValueNumeric.Value);
  Create a virtual channel
  myTask.AIChannels.CreateVoltageChannel (physicalChannelComboBox.Text, "", (AITerminalConfiguration)(-1),
  rangeMin, rangeMax, AIVoltageUnits.Volts);
  Set up sync Specs
  myTask.Timing.ConfigureSampleClock ("", sampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.FiniteSamples, 1000);
              
  Configure start and reference triggers
  myTask.Triggers.StartTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeStartTriggerEdge.Rising);
  myTask.Triggers.ReferenceTrigger.ConfigureDigitalEdgeTrigger ("/ PFI0/Dev1", DigitalEdgeReferenceTriggerEdge.Rising, 100);

  Check the task
  myTask.Control (TaskAction.Verify);
  Create the object reader
  Reader = new AnalogMultiChannelReader (myTask.Stream);
  Start the task, and set the playback position
  myTask.Start ();
  myTask.Stream.ReadRelativeTo = ReadRelativeTo.CurrentReadPosition;

  AnalogWaveform[temp];

  {while(!myTask.IsDone)}
  Temp = reader. ReadWaveform (60000);
  }

  myTask.Dispose ();

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

  Mit dieser Lösung kann man von mension zu messen mension.

  With this resolve you can measure from edge to edge.

• DAQmx: set up a digital acquisition continues with start and stop trigger

  Hi all

  I write because I can not find a solution to my problem.

  As written in the title, I just want to do an continuous (continuous sampling) a digital line. The fact that it's a digital line instead of an analog is no big deal, I guess. I want to start the acquisition on a rising edge of digital trigger (PFI0 for example) and stop acquisition on a trigger too (forehead down on the same signal (PFI0 even then) or a new front amount). This way I could precisely control the time of acquisition or of the start or stop other devices.

  Since this is a digital acquisition, you need to do first "something": create a fictitious analog input task and get the clock back to the digital input. I setting this analogue of the task to start on a trigger. It works but I can't find a way to stop it on another trigger.

  Do u hav no idea how to implement it?

  Finally I have not found an easy way to break cautiously the VI to wait for a trigger (in case you want to start an acquisition with different settings for example). Do you use the task to Abort or is it better to set a deadline to playback digital channel VI until the outbreak occurs?

  Any help would be appreciated!

  Thank you

  Config: LV 2010, latest version Daqmx and USB card or 6251.

  Hi Chris,

  One way is to use counters as Kevin described. For me, it's usually easier to create the dummy task that has the timing engine (as I HAVE), but it depends on what resource you have on your board you will not need .

  In fact, the example is the same thing that you need to measure continues - just what you need to do is remove the counter part and replace the trigger reference to be external (your stop trigger).

  with this approach, you should be able to do the continuous measurement - I noticed that you need DI - in fact with few changes you should be able to use this example. DI does not have its own timing engine, that's why you should use the external sample clock. If we use the example to create dummy HAVE to provide the sample clock, and we start DI task until we start to HAVE fake, then we can get pretty much continuous clock which begins start trigger and stop the trigger of reference.

  Take a look in the change - once again, I have not tested, but logic seems to be OK.

  

  with sincere friendships.

  s9ali

• How to understand the reference trigger as a trigger to stop?

  Hello

  I tried to use an external signal how the trigger works / stop for analog data entry. I had looked for solutions and above all that they suggest to use a reference trigger. But I don't really understand how it is applied. For example, why it should be set to the number of samples before release? For me, the number of samples that are taken are those between the market trigger / stop... I don't really have it.

  Migne

  Hello master,

  As see you, there is no trigger stop easily available with DAQmx. Indeed, you will need to use the reference if you want to trigger the end of the acquisition. What actually a c of reference trigger on a task must begin a kind of continuous acquisition until the trigger occurs. Then by default you will get a certain number of samples before (before) and after (after release) edge relaxation when you read the buffer after the triggering event.

  To read data continuously during the acquisition, you must change a property to change the access mode during playback. You will also need to manage properly reading the buffer has you will certainly get the same amount of samples during the last reading.

  Detailed explanation again as long as there are for example--> http://digital.ni.com/public.nsf/allkb/BA775B0E445BFA79482571FE0032CCEB?OpenDocument

• Digital start and stop trigger with restart HW

  Hello

  I am trying to write a program that reads continually samples based on the rise and fall of a digital triggering.  I want the measure to start on the front of the trigger and stop on the falling edge of the trigger.  I want the data that are read to be preserved and then added with the next set of data that the trigger rises again.  I have read the tutorial "Digital start and stop trigger" and can use the reference to stop the measurement process and I looked at the example "Acq & chart voltage - Int Clk - HW Trig restarts ' that comes with LabVIEW and I can get the two of them working separately with my request.  I'm quite confused however try to put the two together (see attachment).

  If I put a "Start.vi" icon inside the while loop then I get an error "you can do this while the measure is still ongoing".  If I put it out of the loop and then the process only runs once.  I tried to put a loop structure case for restart only if necessary, but this has produced another error which the source escapes me.  Is there a standard way to do this and if so someone can point me in the direction of an example?

  See you soon,.

  Glen

  I think that in this situation, it would be preferable to use a Pause trigger.  You can use the break to stop the acquisition when the trigger was low and start when the trigger is high.  In this way, served only for the duration of your trigger pulse.  I've attached a screenshot of a VI that illustrates this principle in action.

• Compatibility DAQmx and NOT USB-8451

  NEITHER USB-8451 is compatible with NOR-DAQmx?

  The USB-8451 housing does not NOR-DAQmx; It uses a separate driver and API (OR-845 x; ( the latest version is 2.0).

  It is compatible in the sense that you might have OR-DAQmx and NOR-845 x installed at the same time, because they are two independent pieces of software. It is not compatible in the sense that you cannot use the USB-8451 with the API OR-DAQmx case.

• DAqmx and IMAQ pallets do not appear in my palettes of LabVIEW 2011

  Hello

  I use LabVIEW to my University via a Campus license since 2005. I installed it on several computers.

  My problem is related to a new LabVIEW installation on a brand new computer.

  I have the license Site LAbVIEW 2011 Academic just installed and validated (via the License Manager) in this new machine running 64-bit Windows Seven.

  [I also installed the DAQmx and the "distribution of February 2011" IMAQ drivers (downloaded from OR) as well as the NI Vision Software (version for LabVIEW 2011, the same distribution as the LabVIEW 2011).]

  I launched LabVIEW Ant checked to see if everything was there, specifically the DAQmx and IMAQ functions, since I have the cards OR to make the acquisition of data and images. Note that I have not yet installed these cards in the PC. I m going to do only when I would have ensured that all the software is ok.

  The subpalette DAQmx in measurement of i/o functions palette is missing.

  Also, if I'm looking for the NI-IMAQ subpalettes in the range of Vision and movement functions they also lack.

  Notice that all other subpalettes in the range of functions of Vision and movement are OK and there appear (utility of Vision, Image Processing, Machine Vision, and Vision Express).

  Then, I checked if the installed drivers are really there. For this I used the MAX or (measure explore), and it looks like it all everything is there.

  I mean, under NI MAX > my system > software I can see these articles:

  NEITHER Vision TERM 2011

  NOR-IMAQ 4.5

  NOR-DAQmx... several entries

  I checked if the forum or knowledge base in NOR have any clue on what to do, and I found somewhere by the idea of trying to fix the installation via the Windows 7 Control Panel > programs and resources > OR software.  I did this procedure twice, just in case...

  I also tried to remove and reinstall all software (including drivers) and NO, I did it twice. The result is always the same.

  Any suggestions?

  When you install the drivers, you include support for LabVIEW 2011?  If this isn't the case, you won't see the LabVIEW screw in your palettes even if the software is installed.  Normally I expect that the Setup program automatically adds this support, but he can't do it, especially if you have installed the drivers before installing LabVIEW.  See the image below:

  

• Difference between DAQMX and DAQMX base. Task list empty

  Hello

  Can someone please explain the difference between NOR-DAQMX and NIDAQMX base?

  I have recently installed Labview10.0 and NOR-DAQMX base on linux opensuse 11.4 3.4.0. Everythinng works very well. The device is recognized by labview and I put my controller and chassis using nipxiconfig. The DAQ assistant function is missing and also the drop down task and channels is empty, even if I create a new task using the basic NIDAQMX configuration utility.

  Can you get it someone please let me know where I'm going wrong?

  Thank you

  The DAQ Assistant is a Windows program only, DAQmx only.  It not Linux or with DAQmx Base.  DAQmx basic tasks and channels are a little different (I think) counterparts DAQmx.  The fall to the bottom of the list of basic parts, or is it only DAQmx?

  Lynn

• DLL, interfacing with which coexist value and reference types

  Currently, I'm working with a supplied DLL.

  I have header files and everything and the DLL import wizard does a decent job of importing DLL functions but there are certain types of data that cannot simply be dealt with.

  The DLL requires the use of a data type that is a structure with data reference and value types.  I could theoretically replace the references by simple U32s, but much of the information required in the data is in the data referenced by the pointers structures.

  How can I do to implement this light how do I have to be able to transmit data to the DLL in its original form (value and reference types).

  I have something like the following:

  struct point {}

  Int device,

  * The point then

  * Previous item

  * Data Datastruct

  }

  I downloaded the Microsoft WDK, CVI and Visual Studio 2008 available.  I'm not very experienced in this end of things...   I will dispose of Structs with pure value types, but how do I get the data in reference types?

  I strongly suspect that I need a wrapper DLL, but how is the best way to go about this?

  Shane.

  Shane,

  It's always a problem when you use a DLL.

  If you do not have the sources of the DLL, you must trust the description of it.

  (Or you will have to disassemble to be sure, which is forbidden in most cases )

  If (in your case), the linked list is handled elsewhere than your Labview code, you will get in trouble. (Added, deleted, or modified items)

  I don't know your DLL. But usually the data is stored inside the DLL. For example, I have a DLL function that reads a counter from a DAQ hardware. If I reset it (on its reset settings), it sends back the nuber of counted events. This DLL must not be initalized.

  Other hardware DAQ I use must be initalized using its DLLS before you read all the values.

  It all depends on the implementation of your DLL.

  You have a detailed description of your DLL?

  Balze

• DAQmx and PDM not always work

  Hello

  I am new to the DAQmx and PDM vi and I'm hoping someone can help me. The attached code contains several structures of matter, but only one of them has the DAQmx and PDM vi running through them. My intention is to record the output voltage of two photo-recepteurs that I scan the current in a diode laser controller.  When I run this code that it does not always record the values while I'm scanning and when I leave the TDMS files viewer program will show me no data. Sometimes, but rarely, he will show me some data. The sequence stacked within the structure of case is code that runs the laser controller and a couple of translational mounts. The DAQmx and PDM vi who must save the data are right next to that.

  Thank you!

  I have it! All I had to do was move the vi DAQmx Start Task in the Structure box.

  But, I still don't know if I should have analog 1 D wave or analog DBL 2D. Who does?

• Interference between DAQmx and VISA?

  We got a new Lock-in 7270 of Signal recovery that we would like to address by USB, using the driver for VISA provided by them. We have a second device, which is controlled by the NI USB-6212 and DAQmx 8.8 housing. VISA installed version is 4.4.1. Each of them works well as long as one device is turned on. As soon as both are turned on, the NI USB-6212 housing cannot be controlled by Labview more and the lock-in can be controlled only a few times. When the lock-in is positioned on the first, the NI USB-6212 housing is not yet recognized by Windows XP.

  This can be a problem between the two drivers, between DAQmx and VISA, while they interfer?

  No, there is no interference between the pilots. Two USB devices are in the same hub? I saw very similar problems with multiple devices and the hub is not able to provide the power for each of them. The Device Manager will tell you the current requirements for each device that is plugged in and how much is available. Typically of 500 my.

• Query for the partitions of the interval, system and reference

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  In the partition of the interval, the script looks like this

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  cust_id NUMBER

  time_id DATE

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  PARTITION OF RANGE (time_id)

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  REFERENCES parent_tab (id)

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  I want to write a query to find the foreign key name 'child_parent_tab_fk' after the PARTITION BY REFERENCE to the last line, but have no luck so far.

  In the end, I want to achieve this goal:

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  Another yew (reference_partitioning_type)

  Set the foreign key to a variable of type of foreign key

  Is there a way to get the type of partitioning? (interval and reference here)

  Please advise,

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  You can query ALL_PART_TABLES

  REF_PTN_CONSTRAINT_NAME	VARCHAR2(30)		Name of the referential partitioning constraint for partitioned tables reference
  INTERVAL	VARCHAR2(1000)		The value of the interval chain

• How global master pages changes and reference...?

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  Rob

  [email protected]

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  Open your file of "master".

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  If you only want to update the master and ref pages, simply select these options (template =) layouts.

  In most cases, you do not want to activate the checkboxes that remove the replacements.

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• Acronym for "mx" DAQmx and ELVISmx

  My Google-fu, fu reference book and forum-search-fu have me totally failed... I'm sure this has been answered during the passage of NOR-DAQ for DAQmx, but electronic references that have long since disappeared to bit - rot or in the mists of time. That means the "mx"?

  As far as I know, he does not stand for nothing. It's like most of the initials see you nailed on car model names - although a few like GT are initial - or indeed the names themselves. I drive an Elantra - without meaning (in English at least, Korean?), but cool.

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• Continuous output DAQmx and queue software

  Hello

  I'm coming out of a digital waveform on a map of data acquisition using the internal clock. Now, I also store the waveform for later processing by using the exact time at which the wave was written. So I would get a rear wave form that lets me know what state my digital output was at one point.

  Y at - it an option to do this?

  Or, as an alternative, could I somehow synchronize the beginning of the output waveform to the DAQ card with a timed loop? Because I know that the waveform that is written, this loop could return for example of this waveform with the good "t0" for each iteration.

  The code runs on a target-RT.

  Background: I'm controlling one instrument that has no indication of its current state, but I would like to save its current state on the entry of order.

  After some research, I realized that there is a VI 'DAQmx create calendar Source' that returns a source calendar synchronized to the clock of the task DAQmx sampling. This source of synchronization can be used as a source of synchronization for a timed loop. There is here an example for this:

  https://decibel.NI.com/content/docs/doc-25763

  Unfortunately, I realized that my digital I/O hardware has no timing hardware capabilities so too, this does not work for me and I stick to a software solution that is timed.