error 200294 in task Daqmxstart

Hello

I am trying to write and read data at the same time form a cdaq chassis 9172. I have 5 cards of NI/a. and NI D/A 2. I managed to code in a way I can generate and acquire the same chassis. If I read data very well, but when I'm writing, I get error 200294 to the task.vi of daqmxstart. I always thought that I shouldn't start a task every time I write data but I realize, the task would not start unless I first write data. My startup task.vi is inside the loop that causes the error now. I'm only assumming. can someone help me in coding this in a better way to avoid this error?

First pic is how I initialize channels and adjust the sample clock

second pic is my loop of producer, writing and reading.

The remaining part of the code works fine apart from writing data in writing daqmx.

Note attachments removed by the request of the user of the admin-

My friend, you have a few problems here.

First of all. You get the error initially DAQmx is because you start the job with your first loop iteration... and then you start it again on your next iteration of the loop, non-stop between the two.  It works already, so you cannot restart.  So your problem, and why you should take DAQmx beginning out of the loop.  Now, for a write operation, you need to preload the buffer, so that when you call DAQmx writing, there is something to write.  So!  Outside your loop, when you configure your task AO?  You will need to generate data to write, preload buffer and then call DAQmx writing. After that, call DAQmx Start.  THEN go into your loop.

Another thing.  It seems you want new data via writing DAQmx with each iteration of the loop to exit.  Assuming that this is the case, you must configure your task to do this, using a property node DAQmx writing.  The value 'Regeneration' 'do not regenerate.  This will allow you the release of the new data with each iteration of the loop.

The Dequeue function, you have is set to timeout after 10msec.  Suppose it does indeed the expiration time.  You will try to write an empty array of waveforms in your channels of AO.  It would probably be a problem, you will need to handle this possibility.  Make that you like, the easiest is to put your previous valid data in a register shift, check that your Dequeue function to timeout and either use newly corresponding data (if Dequeue has NO expiration time) or use the previous valid data (if the wait does not delay).  When you get new, valid your Dequeue function data, write to the registry to offset.  Which will ensure that what you write always valid data.

Your wait function is redundant.  Your calendar of loop is already dictated by the Dequeue function and your writing DAQmx.  Get out the wait function.  He'll only goof toward the top of your timing.

In addition, you can't your functions of reading and writing to the same pole, since you are not doing anything to synchronize their calendar.  You will probably encounter problems of overflow/underflow buffer with how you have things to implement.  Do a search of synchronized forum for AO HAVE know how to synchronize your tasks.

Take a look.  Modify if needed, but that's how you should make a non regenerative DAQmx writing.  You your research by chance this particular error on the forums before posting?  You probably would have found at least a position very similar to this.

Tags: NI Software

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