buffered operation

[JohnS11]

whats does it mean by selected lines do no support buffered operation?

[P@Anand]

Where did you get this message. Please give your problem bit more detailed.

[JohnS11]

Refer to http://forum.ib-berger.com/index.php?showtopic=12

there's  DIO_PWM_50Hz.LV71.zip

Question 1: How to choose the time base frequency? Any guideline for the M series datasheet?

Question 2: For the digital I/O port, can i choose any of the digital I/O? 

[JohnS11]

if i choose non pfi (digital i/o) and 20MHz timebase, the previous error gone which mention buffered operation etc)

however, theres new error mention: Sample clock rate must match the frequency of the internal timebase specified as the sample clock source

Question 3: what does it mean by "Sample clock rate must match the frequency of the internal timebase specified as the sample clock source"? where to set the sample clock rate in the vi there?

[JohnS11]

Which one should we choose? The digital I/O (which exactly the counter on the board) or any non-pfi digital I/O line?

[JohnS11]

please share if anybody know the answer. Every little bit help a lot. thanks