Function DAQmxCreateAIVoltageChan excepts only -1 for parameter terminalConfig.

[RenéM]

When configuring the AI ports on a USB6008
int32 __CFUNC     DAQmxCreateAIVoltageChan          (TaskHandle taskHandle, const char physicalChannel[], const char nameToAssignToChannel[], int32 terminalConfig, float64 minVal, float64 maxVal, int32 units, const char customScaleName[]);         
Using the code
    status = DAQmxCreateAIVoltageChan (tAIr, tmp_arr, NULL, DAQmx_Val_NRSE, (float64)numericUpDown_Ur_min->Value, (float64)numericUpDown_Ur_max->Value, DAQmx_Val_Volts , NULL);
produces a runtime error  "Requested value is not a supported value for this property." for the parameter terminalConfig.

Using the value -1 for this parameter works but I dont know what configuration this is.

RenéM

[Paul_C.]

Hi RenéM,

The USB 6008 doesn't support NRSE connections.  However, you could try connecting it differentially and using AISense as the negative pin as suggested in the following thread found here. 

I hope this helps,
Paul C.