Trigger CCD camera at certain frequency

Hi,
We are trying to trigger a CCD camera for capturing image at certain frequency. Our hardware setting is as follow: we have NI PCI-6281 DAQ card installed on the computer. It connects to BNC-2110 box. The trigger output PFI 12/P2.4 on BNC-2110 was connected to a CCD camera through a 12-Pin Hirose female to BNC cable.
To test whether the triggered image capture works properly. We used Gen Dig Pulse.vi and Triggered Grab.vi. The triggered image capture did work, but it does not work at the desired frequency set by us. I assume the frequency is (1/(high time + low time)). Any suggestion?
Thanks.
Attachments:
Triggerd Grab Test 2-1.png ‏240 KB

This answer doesn't make sense. If what you say is true, the camera isn't really synchronized with the clock.
What happens if you set the off time to a very long time like 20.2 seconds. Do you see a new image every 20.7 seconds, do you see two images captured close together then a long gap before the next 2?
Mike...
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