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PCI-4452 triggering

How can I read only one scan right after triggering with PCI-4452?

I have a rotary encoder which generate 625 square waves (TTL) per one revolution,
whose speed is around 7kHz.
This is going through the EXTTRIG line on PCI-4452 DIO channel.
All I want is to scan one Analog signal datum whenever these TTL rising edges
occure, so I'll have 625 data per revolution.
Even though it's pretty easy concept, I can't still make it in Labview with
PCI4452, which has been already done in C language with the pretty decent
DAQ hardware.
First of all, I wonder if this is possible for PCI-4452.
And I wonder if anybody know what kind of loop and algorithm should be used.
I hope if I could get some example programs. This is pretty general concept
for t
he vibration test to syncronize the rotary system.
I really need your help.
Thank you.

Choi
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