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PXI-6229 PFI Channel problems

Hi, I have a PXI-6229 module that im using for generating SPI interface. My problem is that at a point in my test session i want to tri-state CS,CLK and DO.  I had to to use the PFI instead of DIO channels to use this functionality. When writing the CS,CLK and DO data to Digital 1D Wfm NChan NSamp VI i get an error:

 

Error -201062 occurred at DAQmx Write (Digital 1D Wfm NChan NSamp).vi:2

Possible reason(s):

Measurements: Selected lines do not support buffered operations.


 If using change detection, the task must be changed to non-buffered hardware
 timed single point to support these lines.

 

Device: Dev2
Physical Channel: port1/line0

Task Name: _unnamedTask<1D>

 

I get that the PFI channels arent buffered BUT how can fix this with tri-state on channels that only work on the PFI channels?

 

I really need help.......

 

Thanks.......

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