Problems with multifuction

[coolavr]

When i use two DaqMx assistants, one for input and the other for output i get this error:

Measurements: Write cannot be performed when the task is not started, the auto start input to DAQmx Write is false, the Sample Timing Type is something other than On Demand, and the output buffer size is zero.

Call DAQmx Start before DAQmx Write, set auto start to true, modify the Sample Timing Type, or change the output buffer size.

How can i fix this problem?

[Hillman]

Hi Coolavr,

Thanks for the post. 

Could you please attach the code setup your using?

[smikel]

Hi coolavr,

You sould not have any problems using two simultaneous DAQmx assistants one for input and one for output.

You should remove your assitants and add new fresh ones just to make sure everything is correctly set up. I attach a VI that you could try on your system, just make sure you select your DAQ device on both assistants otherwise you will get an error message as LabVIEW will try to locate my DAQ device. It is just a simple input/output VI that runs with no problem in my PC and should let us know if your device is working fine.

[smikel]

--- If after replacing your Assistans you are still getting error messages, then you should try to set up your DAQ Tasks manually. I attach a VI that shows how to create DAQ tasks Manually.