Error 200278 occures when acuiring single channel on PDA.

[arvin_labrat]

I am using Labview 7.1 with PDA modual 7.1. My daq card is 6025 and the PDA is a ipaq 5550.

I'm using the example Cont_Acq_Graph_Voltages Int Clk.vi. When I configure a task in the task manager for single ch, build the app then download I get an error 200278 when i run the app. i do not reciecve an error if i use multiple chs. It does not matter what the scan rate is set to.

Does anyone know a reason for this.

Thanks in advance,
Eric

[Ricardo_SR]

Hi Eric,

Can you tell me if you are doing a finite or a continous acquisition? If it is finite, will it run once and on the second itteration will it give you the error?

Ricardo S.
National Instruments.

[arvin_labrat]

Hi Ricardo,

I'm running a continuous acq. It runs for 1000 samples then gives me the error -200278. It does not matter what the sample rate or the number of samples per channel I set.

One problem I noticed, I used a vi that was working previously, did not make any changes to the VI, but I did change the task configuration Utility. I built the app with the new tasks, downloaded the app to my PDA, ran the application and recieved the same error.

If you can provide a detailed explination of the error and some possible reasons for the error I would appreciate it.

Thanks
Eric

[arvin_labrat]

Hi Ricardo,

I believe i solved part of my problem. Some of the data processing was taking longer than the time required for the samples to be read again. The errors occur at 1000 samples. Can you tell me how large the buffers are with daqmx base?

I solved it in two ways. One, by increasing the convert rate as fast as possible. Second, I decreased my scan rate to give my data processing more time to finish.

Is there any way to increase the buffer size on the PDA since it does not support property nodes.

If you have anything to add i would appreciate any additional info.

Thanks
Eric