How can I program Labview to do encoder based DAQ using an E-Series board?

[Brian0729]

I am running 6i on NT with a PCI6052E board. I would like to time my data acquisition based on the pulses of an encoder. I know I can use the counter/timers to count the pulses from the encoder, but how do I use the counter/timer to drive my data acquistion?

[Jim_Kring]

There is a good discussion on using quadrature encoders with the E-Series DAQ cards at the following location:

http://zone.ni.com/devzone/devzoneweb.nsf/opendoc?openagent&36BD71244BB26FC886256869005E541B&cat=75CA12ECD25F39A78625679000743752

One way to do what you are talking about is to have an encoder pulse drive the DAQ clock. You can trigger the acquision to occur at a specific time (i.e. position) after an index pulse. You should try to get to know the low-level DAQ routines intimately before trying to do this. Look at the hardware triggered DAQ for a start.

Another approach is to use a motion control card to acquire the encoder position and set breakpoints to trigger DAQ events.

You will also want to take a look at how RTSI works if you want to route
trigger and timing signals between cards.

-Jim