Use this command apply a software Trigger signal to the video device that is set to the trigger mode. The trigger signal usually initiates an acquisition of a single frame. In the start/stop mode, mostly used by line-scan devices, this command should be used twice: first time to initiate the frame acquisition and second time to finish it. In this case the size of the frame will depend on the time between two consecutive Trigger commands.
If the video device is working in the continuous mode, this command will be unavailable.