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PCI-4452 triggering

This is 'Urgent'...

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 the vibration test to syncronize the rotary system.
I really need your help.
I really appreciate your kind consideration.

Choi
chois4@rpi.edu
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Message 1 of 2
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I have tried to use a standard board to read from an encoder before. Good
luck. I had to finally get a quadrature input board, and write my own .dll
file to use. That was before NI made a motion control board.
I used a Kiethly Metrabyte M5312 board, and was able to read and write
on a register level. It kept count (Up and Down), I did the math to derive
depth of Coiled tubing.
Hope this helps,

S. Choi wrote in message news:38bed68b@newsgroups.ni.com...
>
> This is 'Urgent'...
>
> 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 sc
an 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 the vibration test to syncronize the rotary system.
> I really need your help.
> I really appreciate your kind consideration.
>
> Choi
> chois4@rpi.edu
>
>
>
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Message 2 of 2
(1,756 Views)