Can a counter source be inverted on the 6229

Question

Can counter a source, for example "Dev1/Ctr0InternalOutput", be inverted on the 6229.  Currently, when I used the following line,
DAQmxConnectTerms ("/Dev1/Ctr0InternalOutput", "/Dev1/PFI4", DAQmx_Val_InvertPolarity);
I received an error stating that the hardware thus support inversion.  Thus the problem lies in the source or the destintation terminal?

Answer 1

Hi cscp,
The 6229 does not have general purpose inverters available for such
signal paths, and therefore is not capable of signal inversion as part
of the DAQmxConnectTerms function call.
As part of the functionality of the on-board counters, however, the 6229 DOES have the ability to set the polarity of the counter output event.  Use the following function call:
DAQmxSetExportedCtrOutEventPulsePolarity(TaskHandle taskHandle, int32 data);
setting the data parameter to DAQmx_Val_ActiveLow (10096).
Hopefully this helps out.  If not, let me know, and we can keep
working to get this issue fixed.  Best of luck on the application.
Have a great day!
Travis W