Hi TJR-
Your board is now supported under NI-DAQmx. I would suggest using the DAQmx driver over the Traditional DAQ driver because of its increased performance and ease of use in programming.
Two shipping examples that could meet your need come to mind:
First, for a pure digital start trigger you will find "Acq&Graph Voltage-Int Clk-Dig Start.vi" quite useful. This example performs a finite acquisition of user-specified length in response to either a rising- or falling-edge signal on the PFI0 trigger pin.
Second, for an analog interpretation of your digital signal that will allow for trigger level configuration you might find "Acq&Graph Voltage-Int Clk-Analog Start w Hyst.vi" useful. This example uses the PFI0 trigger line (or any analog input channel) to check for a user-specified voltage level and even includes support for analog hysteresis to avoid unintentional trigger assertions and deassertions by noise or jitter on the digital trigger signal itself.
Both of these examples can be found by opening LabVIEW and choosing Help>Find Examples from the menu bar. Then browse to the Hardware Input and Output>DAQmx>Analog Measurements>Voltage folder.
Tom W
National Instruments