How to set a pre-trigger when triggering off a physical channel

I am trying to set a pretrigger when triggering off a physical channel when the voltage is above a threashold. Basically I would like to capture the pretrigger and posttrigger from a channel. I am using Visual C++.NET with Measurement Studio 7.1 with DAQmx 7.4 driver. I used to program this application with Visual C++ 6.0 with traditional NI DAQ with software analog (stop condition). How do I program in the DAQmx ?
Thanks,
Yajai

In NI-DAQmx, the triggering technique you are referring to is called 'Reference Triggering'. In the attached zip folder is an ANSI C example in NI-DAQmx that demonstrates analog input with a digital reference trigger, acquiring pre and post trigger data. You will have to change the reference trigger function to use an analog edge as opposed to a digital edge (use DAQmxCfgAnlgEdgeRefTrig function). Also in the attached zip file is the NI-DAQmx C Reference Help. You can find all the DAQmx functions and properties there. Hope this helps.
-Alan A.
Attachments:
DAQmx_ref_trig_and_HelpFile.zip ‏53 KB

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