LVilla
You will need to use the Select_Signal function and the GPCTR_Change_Parameter function.
First, set the PFI0 line on the 6071E to goto a RTSI line using the Select_Signal fucntion. (Signal Name = RTSIx, Signal Source = I/O Pin 0)
Second, set the Gate of the 6602 to read from the RTSI line. Use the GPCTR_Change_Parameter function for this. (Parameter Type = Gate, Parameter Value = ND_RTSI_x, where x is the RTSI line.)
I hope this info helps you get started on this application.