SPOT 4.1 Basic and Advanced Software Manual for SPOT Insight ...

Ch. 5 – Preparing to Take a PictureThe Edge and Bulb Trigger features allow external devices to start an exposure directly in the camerawithout software intervention via a TTL input signal.Typical benefits of using the external trigger mode include:• higher accuracy of the start of the exposure, as potential interrupts on the computer bus areavoided (edge and bulb trigger)• the ability of external devices to directly start exposures without a software interface (edge andbulb trigger)• the ability to control both when the shutter opens and also when the shutter closes, again withoutuse of a software interface (bulb trigger only).Note: TTL stands for Transistor Transistor Logic and is a signaling I/O common to electronicdevices.The following discussion highlights the features and use of each external trigger mode.a) Edge Trigger - In this mode, the exposure is initiated by the rising edge of a TTL signal and isterminated after a software-programmed duration.ExposureTriggersheretExposure completedafter softwaredeterminedperiod = tTo use the Edge Trigger feature in Manual Exposure mode, do the following:Select Image Setups from the dropdown menu and open the desired Image Setup.a) In the Manual Exposure Window, setExternal Trigger Mode to Edge Trigger.Set the computer controlled exposure timeand set the Gain.b) In the Exposure Window, set the ExposureType to Manual exposure.c) If you choose the Sequential ImagingFunction you will need to select whether you externally trigger only the first imageexposure in the sequence or every image exposure in the sequence.100 User Guide to the SPOT Insight Camera