I already answered your similar question
External trigger for point grey camera[
^] posting a link to a specific Point Grey knowledge base entry.
Please read that and follow the links in it (one is pointing to
Technical Application Notes: Synchronizing to an external trigger signal using DCAM 1.31 Trigger Mode_0[
^]):
Quote:
Example Programs and Source Code
The AsyncTriggerEx sample program that is included with the FlyCapture SDK. It demonstrates some of the basic asynchronous trigger capabilities of the Applicable Products above. This program only works with cameras that can be asynchronously triggered, either using an external hardware trigger or by using the camera's internal software trigger.
Search also the knowledgebase and application notes for other entries related to your problem.
What do you want to achieve in the end?
The external trigger is an additional input pin of the camera. It is not connected to the PC (besides you have some kind of IO card in your PC that is connected to one of the camera's GPIO pins).
So you can't trigger the camera (as indicated by the function name
FireExternalTrigger
) using an external trigger by software. You can only configure the camera. To trigger the camera by software, use the provided software trigger method.