How to trigger 5v -ve polarity from pci 6251 to sincronise the image capture

Hello!
I want to synchronise the image capture of an IEE 1394 firewire camera with an 50hz input signal (acquired from Vsync of VGA port ). I want to accomplish this using PCI 6251 (SCB 68 E series) device. The IEE 1394 camera can be triggered using a 5V –ve polarity signal but have no idea how it is achieved, some examples about the application would be helpful
shri

This example illustrates how an application might be constructed in order to trigger an analog acquisition as well as an external system concurrently with an E-Series board. The analog component has been made retriggerable by tying a counter pulse train to its sample clock. Due to the complexities of the DAQ STC, an analog output line is employed in order to generate a hardware-timed, regular, pulse used to trigger both the analog acquisition, and potentially an external system. This type of architecture could be used for "stimulous - response" testing.
Attachments:
Timing_with_AO.vi ‏123 KB

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How to trigger 5v -ve polarity from pci 6251 to sincronise the image capture

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