Question-DAQmx: Using multiple channels on a single device with a trigger

The purpose of the attached VI (Switching_Controller.vi) is to wait for a trigger signal from the input and output a pulse whenever it occurs. However, at the same time I want to output and read a single sample from another input and output channel pair (behavior in Main_Controller.vi). I was planning on doing this in two parallel subvi's but I am running into the common error -50103, "specified resource is reserved". I understand that in order to address this issue I need to compress all output channels and all input channels into just two tasks. However, I am having trouble addressing the issue of the trigger, since I want the second set of inputs and outputs to happen continuously and the trigger forces the task to a certain rate of repetition. Is there any way to run a multichannel task in two parallel subvi's?
Thanks in advance for the insight.
Solved!
Go to Solution.
Attachments:
Switching_Controller.vi ‏36 KB
Main_Controller.vi ‏20 KB

Hello!
Take a look at the attached screen shot. I wrote a small (and very simple) example that I think you'll be able to modify for your needs. Basically, we can use the start task to avoid getting resources reserved and break the task apart so that we write 1 sample on n channels and then write a waveform on a another channel.
You will notice that I needed to enable the "autostart" function of the DAQmx write for the waveform data by writing a true constant to the vi. This way, the vi will start on its own with a start vi.
Hope this helps!
Regards,
Margaret Barrett
National Instruments
Applications Engineer
Digital Multimeters and LCR Meters
Attachments:
multi-channel.png ‏24 KB

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Question-DAQmx: Using multiple channels on a single device with a trigger

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