ncSetAttribute, USB-8473

[anAlias]

I'm trying to use the ncSetAttribute to turn on the debugging modes of the USB-8473.

However, there is an apparent "chicken vs. egg" issue in the interface.

 To use the ncSetAttribute, I need to stop the interface.  The only way I know to stop the interface is to use ncCloseObject.

If I call ncCloseObject, then  my ObjHandle is invalidated.

However, I need my ObjHandle to call ncSetAttribute.

If I call ncSetAttribute before calling ncOpenObject, then I don't have a valid ObjHandle to pass to ncSetAttribute.

How is this supposed to work??

[Sammy Z]

Hi,

Please look at the following link on page 11-18.

http://www.ni.com/pdf/manuals/370289j.pdf 

If you call ncSetAttribute before sending your packets you should be fine.

Are you using LabVIEW? What version?

Regards,

Sammy Z.

[anAlias]

I forgot to post earlier.  I figured it out.  I need to call ncAction to stop the port after opening it with ncOpen. 

I don't use labview.

It would be nice if NI did a better job with the C chapter of the manual.  There are lots of errors in it.  You end up looking at the labview chapter and trying to decide if the C code should really work like the labview code or if they are supposed to be different. 

[O_Proulx]

Hello anAlias,

Please feel free to let us know the errors you found and we will make sure they are corrected in future versions of the manual.

Thanks,

[Sammy Z]

Hi anAlias,

I'm glad your issue is solved and thank you for your input.

Sammy Z.