One-shot acquisition AVT Guppy

Dear
I'm trying to acquire 1 one image using the trigger input of a AVT Gyppy F-080B camera.
In the manual of the Guppy I found the "One-shot" mode to acquire just one image from the camera using the trigger input.
So far I have the code attached that sets the registers of the camera, I think that's ok.
What I'm not so sure of is the sequence behind:
1) Do I need to start an acquisition using IMAQdx Start Acquisition.vi (I think yes since I don't get an image without this vi)
2) How do I retrieve the image from the camera? Using IMAQdx Get Image.vi or IMAQdx Grab.vi.
With both vi's I get an image out of the camera but... ...
I never gave a trigger pulse
Using the max I was able to get an image on a trigger pulse
Acquisition attributes\Timeout set to 20000
Camera attributes\Trigge\Trigger Activation = High level
Camera attributes\Trigge\Trigger Mode = Mode 0
Camera attributes\Trigge\Trigger Parameter = 0 (no idea what this is)
When I then click the "Snap" button, nothing happens until I activate the trigger line of the camera.
Only at that time I get an image in the MAX.
If I wait more than 20 seconds I get an error message.
This is exactly what I need, but I can't translate it into LabVIEW code
What am I doing wrong?
Thanks for any inputs!
Best regards
Attachments:
TriggerImage.vi ‏51 KB

Hi Alain,
I wasn't sure if the stop would actually work. I trusted BlueCheese on that. But apperantly it doesn't.
Why you dont see the StopLoop indicator increasing are because it is waiting for an event. Hense the name of the structure. It will wait very efficient for a user event on the stop button. The while loop will iterate only once in my example code image. Leaving you with the value 0.
I have some suggestions how you can implement a stop button but this will include polling and only one loop.
If you set your timeout to 500ms or 1s your snap VI will timeout more often and when this happens you should chech the error code and clear the error if a timeout occures and then check if the stop button was pressed and if it was stop the loop otherwise just iterate again. Would look something like this.
I had 500 as timeout and therefore constant 40 would be if the camera timeouts for 20 seconds in a row without the stop button being pressed I quit the application. I also quit it every 500ms on stop button press and also on error other than timeout. I don't know the timeout error number but set that instead of 1 and you will have a working code.
Best Regards
Jonas Mäki
Applications Engineering
National Instruments

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