DAQmx, specify resource occpaied

[Gerryli]

I am using a below function to get the digital port status of DAQ card. DAQmxErrChk(DAQmxReadDigitalU32 (Handle, 1, 10.0, DAQmx_Val_GroupByChannel, &SSR, 1, &read, NULL)); whole code as below: error = Init_DA_Brds (1, &BoardCode); DAQmxErrChk(DAQmxResetDevice ("DAQmxDev1")); DAQmxErrChk(DAQmxCreateTask ("", &Handle)); DAQmxErrChk(DAQmxCreateDIChan (Handle, "DAQmxDev1/port0/line6", "", DAQmx_Val_ChanForAllLines)); DAQmxErrChk(DAQmxReadDigitalU32 (Handle, 1, 10.0, DAQmx_Val_GroupByChannel, &SSR, 1, &read, NULL)); DAQmxErrChk(DAQmxClearTask (Handle)); however, some of times i get error that DAQ resource has been occpaid. later on , if i try to reset in Max, also a error report, whatever i reset the driver in traditional DAQ according to instruction. do someone know this problem ? ( i am using CVI 7.1+ DAQmx 9.0.2) B.R Gerry

[muks]

How do you prevent non-fatal run-time errors from being displayed?

[muks]

Causes of NI-DAQmx Error -50103 "The Specified Resource is Reserved"

[Gerryli]

Hi, Muks

Firsty, thanks very much for you attention. 🙂 

however, i am not sure i understand you question correctly. this problem was not occured at first time of program running.  and once this happend , the only way to solve is restarting the computer .

B.R

Gerry

[王晓建]

Hi~

Seems that you are switching the device between DAQmx and Traditional DAQ. This may be helpful.

[Gerryli]

Hi,

 i have used inital function before i call that one

error = Init_DA_Brds (1, &BoardCode);

DAQmxErrChk(DAQmxResetDevice ("DAQmxDev1"));

B.R

Gerry

[Gerryli · Accepted solution]

i have found the reason.  another threading also read the digital line in order to have the flag.  it looks DAQmx does not support this one as well.  because my previous version was made by traditional driver, and i did not see any problem.

anyway, thanks for all peoples attention!

B.R

Gerry