Camera Interface2-32 Basler A400kDRAFT2.5.8 Flash Trigger SignalA400k cameras output a flash trigger signal that can be used to trigger a flash exposure. The flashtrigger output connector is described in Section 2.1.4.The flash trigger signal can be programmed to operate in five different modes:• The signal is always low, that is, deactivated.• The signal is always high.• The signal is high as long as the sensor’s flash window is open, that is, all pixel lines areexposed to light. The signal goes high when exposure starts in the last pixel line of the areaof interest and the signal goes low when exposure ends in the first pixel line.• The signal is low as long as the sensor’s flash window is open, that is, all pixel lines areexposed to light. The signal goes low when exposure starts in the last pixel line of the area ofinterest and the signal goes high when exposure ends in the first pixel line.• The signal is tied to the ExFlash input signal provided by the frame grabber and the signal ishigh while the ExFlash signal from the frame grabber is high.• The signal is tied to the ExFlash input signal provided by the frame grabber and the signal islow while the ExFlash signal from the frame grabber is high.In addition, four switching options are programmable:• TTL• Open collector or Low Side Switch, 5 V max• High Side Switch 5 V• High ImpedanceThe switching options are explained on page 2-5.2.5.8.1 Setting the Flash Trigger SignalYou can set the flash trigger signal using either the Camera Configuration Tool Plus (CCT+) orbinary commands.With the CCT+With the CCT+ (see Section 4.1), you use the settings in the Flash Trigger parameter group.By Setting CSRsYou can program the flash trigger signal by writing a value to the Mode field of the Flash TriggerOutput Mode CSR and Flash Trigger Switching Mode CSR (see page 4-31).See Section 4.2.2 for an explanation of CSRs. See Section 4.3.1 for an explanation of using read/write commands.L If the exposure time setting on the camera is lower than the minimum flash exposurerequired (see page 3-9), no flash trigger signal will be output.
