NIDAQmx I/O Controls functions

[vix]

Hi,

I don't understand how the function NIDAQmx_GetDeviceCtrlAttribute() and NIDAQmx_SetDeviceCtrlAttribute() work with NIDAQmx_IOCtrl_Target attribute.

The help says it is the target name, so I think these two functions should simulate the selection of a board from the NIDAQmx Device Control (Custom Controls >> NI-DAQmx IO Controls >> Device) and should return the selected device.

But they don't work in this way.

• The Get() function always returns an empty string (but a simple GetCtrlAttribute() returns the selected device)
• The Set() function fails with "error -10006 Cannot read from target. Check target and connection."

See attached example that shows what I mean.

What does exactly mean the NIDAQmx_IOCtrl_Target attribute?

[rivand]

Dear all,

NIDAQmx_IOCtrl_Target is a sort of description field, set only with the proper NIDAQmx_SetDeviceCtrlAttribute(). Without setting manually this property, the value returned by NIDAQmx_GetDeviceCtrlAttribute() is always an empty string.

Regards,

Andrea R.