Dear,
We have a problem with the acquisition of analog signals. Acquisition of analog signals keeps waiting for a
pretrigger (digital) signal with Windows 7 and not with Windows XP.
Used acquisition module : USB-6216 (BNC)
Trigger connected to PFI0.
Analog signals connected to AI0 and AI1.
Acquisition is done with a C++ program which uses the National Instruments Library.
Used calls are:
- DAQmxCreateTask("",&taskHandle)
- DAQmxCreateAIVoltageChan(taskHandle,dev.c_str(),"",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL)
- DAQmxCfgSampClkTiming(taskHandle,"",sampleRate*1000.0,DAQmx_Val_Rising,DAQmx_Val_FiniteSamps,this->expectedSampleCount)
- DAQmxCfgDigEdgeRefTrig(taskHandle,"/Dev1/PFI0",DAQmx_Val_Rising,this->preTrigger)
- DAQmxTaskControl(taskHandle,DAQmx_Val_Task_Commit)
- DAQmxStartTask(taskHandle)
- DAQmxReadAnalogF64(taskHandle,this->expectedSampleCount,timeOut,
- DAQmx_Val_GroupByScanNumber,this->data,this->dataSize,&read,NULL)
- DAQmxStopTask(taskHandle);
- DAQmxClearTask(taskHandle)
Everything is running fine under Windows XP (single core), but for Windows 7 (dual core) we need to add a waiting time between a
DAQmxStartTask and a DAQmxReadAnalogF64.
Additionally, we clear the error -200281 and still we have a problem sometimes.
Does anyone have an idea what is going wrong? I have attached the code of the class.
Kind regards,
Ronny Comyn
Picanol
Belgium
