Need help in converting Traditional DAQ subvis to DAQmx configuration

i need to convert these vis (of traditional NI DAQ) to be used with a new DAQ card that supports only NI DAQmx.
please help me in this..
Can i use the same traditional NI DAQ VIs with NI PCI 6221?? if so how can I? does this device can be configured for traditional NI DAQ???
Kudos always welcome for helpful posts
Solved!
Go to Solution.
Attachments:
traditional ni daq vis to daqmx.jpg ‏1857 KB

NI has several resources to help move from tradtional DAQ to DAQmx. A good place to begin is the Getting Started page. There is a tutorial on how to transition. There is also the compatability VIs that replace certain traditional DAQ functions with wrappers around DAQmx functions. The DAQ example you posted is pretty trivial and really should not take much time to convert once you get a basic understanding of DAQmx.

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Need help in converting DAQ to DAQmx

Hi,
I've struggled with coverting traditional DAQ to DAQmx for two weeks. I really need help from someone.
As you can see the picture below, I've tried to replace the old VI's with new ones. But, it doesn't work. Of course, the VI below is just a part of my VI. VI's after case structure are inside of while loop.
Could you please give me thought that why it doesn't work?
FYI: The strange thing about it is that it runs without any error messege, but there is no actual output (values on the graph, data in arrays, etc).
Thanks in advance.
Best,
Jay
Solved!
Go to Solution.
Attachments:
Untitled 1.vi ‏74 KB

Hi Jay,
Assuming that the Traditional DAQ and DAQmx code are screenshots from separate VIs, I believe that the following parameter of the read functions in each driver would account for the different behavior that you are seeing (you have both set to -1):
Traditional DAQ:
DAQmx:
So, when you give DAQmx Read a -1 for "number of samples per channel" when running a Continuous task, the effect is that it will return whatever data is available at the time DAQmx Read is called. In your case this is immediately after the task is started so there very well could be 0 samples available in the buffer. I'd imagine that you would see data if you change the value of this parameter from -1 to the actual number of samples that you want to read.
Having said this, if you want to acquire continuously you should call DAQmx Read from inside a loop. I agree with the others that you should take a look at the DAQmx shipping examples to help get started, you will probably find something very close to what you want to do. You can find the examples at:
Help >> Find Examples... >> Hardware Input and Output >> DAQmx
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