DAQ Assistant: How Can I Control this at the lowest Level?
DAQ Assistant:
I have the PCI slot version of this which I use to generate specific signatures. However I would like to get down to the very low level of this block to see what makes it tick if only to add some other features such as have it dynamically change high and low times after "N" number of pluses/bursts.
At the current state I can't seem to get any further than the GUI that I work with right now. I can give you a VI upon request however this VI is included with labview from what I understand I have version 8.2. If anyone wants a copy of the vi which contains the DAQ Assistant block I will be more than happy to include.
DAQ Assistant Location: Right click on the block diagram of a VI --> Measurement I/O --> NI-DAQmx --> DAQ Assist (This is an icon in itself)
I see the read,write nodes however I have played and tried to see what they do but I have had no such luck. If anyone can point me in the right direction I would be grateful.
Thank You.
Solved!
Go to Solution.
You've got a couple of misconceptions about the DAQ Assistant. First, there is no such thing as a pci version. There are some slight differences between versions of the DAQmx driver. Second, the DAQ Assistant is a code generator. When you start it up, it will create custom code for the type of task you want (digital i/o, analaog i/o, etc.) so the VI you eventually have on the block diagram is not included in any version of LabVIEW.
Once you have configured the assistant, you can right click on it and select 'Open Front Panel' this will convert the assistant task to a normal subVI that you can opne and view the block diagram. You can also right click and select 'Create DAQmx Code'. This will place the low level DAQmx functions on your block diagram. You could also skip the whole assistant and just start with the low level DAQmx functions in the first place. There is help associated with each and you have all of the shipping examples to look at. There is also the Getting Started with NI-DAQmx page.
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Labview ignores all but 1 Daq Assistant, how can I avoid this?
When I am putting together my block diagram, I use the DAQ Assistant to orchestrate everything. Then when I go to create another DAQ Assistant instance, LabVIEW seems to ignore the first one. It appears as though I can only use one DAQ Assistant at a time in my VIs, is this the case? I am a bit of a novice, is there an easy way to avoid this, or change the orginal DAQ Assistant into some other form so I can use another DAQ Assistant for developing another part of my VI?
I have looked long and hard for a good explanation of the difference between Tasks and Virtual Channels and while I have found efforts at explaining it, I do not understand. I see that I can convert my DAQ Assistant into a task, but then I have a task output which does not help me (I need a data output for my VI).
I am sure this is obvious to someone that has done it a million times, but I just can't find an answer wading through all of the knowledge base information or the LabVIEW help.
Thanks a bunch!
~milqmanHello milq,
That following tutorial that Novatron linked you earlier is an awesome resource for becoming familiar with programming with the NI-DAQmx.
Learn 10 Functions in NI-DAQmx and Solve 80% of Data Acquisition Applications
An important point to take away from this tutorial is that you can either create a DAQmx task using the wizard-style interfaces provided by the DAQ Assistant and within Measurement & Automation Explorer (MAX), or you can programmatically create and configure your DAQ Task in your LabVIEW code using the DAQmx Create Virtual Channel VI, DAQmx Timing VI, etc. When you create a new DAQmx Task using the wizard-style interface, you are configuring all of the settings for your task manually. When you use that DAQmx Task in LabVIEW (with a DAQmx Task Control or Constant), you are referencing all of those configuration options you've manually set. To actually perform a read or write operation based on those settings, you need to wire the DAQmx Task into the 'task in' input of a DAQmx Read or DAQmx Write VI.
So for your analog input operation, you can wire the task directly into a DAQmx Read VI. In the DAQmx Read VI, you'll want to select the type of task your reading from in the drop down box (Analog), if your reading from a single or multiple channels (1 Chan or N Chan), and if taking just one or multiple measurements with each call to the DAQmx Read VI (1 Samp or N Samp)
For your digital output operation, you'll want to configure a separate digital output task, and wire it directly to a DAQmx Write VI. Again, select the type of task your writing to (Digital), if your writing to a single or multiple channels, and if you want to perform a single write or multiple writes.
To help with getting started with DAQmx programming in LabVIEW, I would highly recommend taking a look at the DAQmx example located in the LabVIEW Example Finder (Help > Find Examples). A difference you'll note in these examples is that all the task configurations that you have been making with the wizard-style DAQ Assistant are done programmatically with the DAQmx Create Channel and DAQmx Timing VI. I hope this helps and good luck!
Travis G.
Applications Engineering
National Instruments
www.ni.com/support
Message Edited by Travis G. on 06-21-2006 05:23 PM
Attachments:
AnalogInDigitalOut.Jpg 21 KB -
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