I can't stop finite samples daqmx read between the two?
Hi all
I want to read data from 10 seconds to a trigger is received. for this im using daqmx task finished sample mode and read the data on the trigger getting. It works fine but I can't stop my vi between the two when its reading of the data. I have to wait for it to complete the reading of values, and then stop the vi.
so I switched to continuous sampling mode that allowed me to stop the vi whenever I want.
I just want to know is there any means or the property using which I can stop my task over daqmx read when I want?
I guess you call DAQmx Read with extraordinary value (-1) for samples of #. It is also the default if left thread continues. In a finished sample task, it means to wait until the memory full buffer has been filled with samples before returning. Once you make that call, you cannot directly finish soon. You're stuck waiting for buffer fill or for the timeout expires (default 10 seconds).
One way to avoid getting stuck is not to ask for samples that do not exist already. You can query a DAQmx Read property, known as the "Samples available" or something like that and son of this result in a call to DAQmx Read. Such a call will return immediately whatever data are currently available. Subsequent calls will give you samples.
-Kevin P
Tags: NI Software
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