Image Acquisition Control AW00123409000126 Basler ace USB 3.06.4.2 Using a Software Frame Start Trigger6.4.2.1 IntroductionIf the Trigger Mode parameter for the frame start trigger is set to on and the Trigger Sourceparameter is set to software, you must apply a software frame start trigger signal to the camera tobegin each frame acquisition. Assuming that the camera is in a "waiting for frame start trigger"acquisition status, frame exposure will start when the software frame start trigger signal is receivedby the camera. Figure 55 illustrates frame acquisition with a software frame start trigger signal.When the camera receives a software trigger signal and begins exposure, it will exit the "waiting forframe start trigger" acquisition status because at that point, it cannot react to a new frame starttrigger signal. As soon as the camera is capable of reacting to a new frame start trigger signal, itwill automatically return to the "waiting for frame start trigger" acquisition status.When you are using a software trigger signal to start each frame acquisition, the camera’s ExposureMode parameter must be set to timed. The exposure time for each acquired frame will bedetermined by the value of the camera’s ExposureTime parameter.When you are using a software trigger signal to start each frame acquisition, the frame rate will bedetermined by how often you apply a software trigger signal to the camera, and you should notattempt to trigger frame acquisition at a rate that exceeds the maximum allowed for the currentcamera settings. (There is a detailed explanation about the maximum allowed frame rate inSection 6.10 on page 178). Software frame start trigger signals that are applied to the camera whenit is not ready to receive them will be ignored.Section 6.4.2.2 on page 127 includes more detailed information about applying a software framestart trigger signal to the camera using Basler pylon.For more information about determining the maximum allowed frame rate, see Section 6.10 onpage 178.Exposure(duration determined by theExposureTime parameter)Software Frame StartTrigger Signal ReceivedFrameAcquisitionExposureSoftware Frame StartTrigger Signal ReceivedFig. 55: Frame Acquisition with a Software Frame Start Trigger
