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Hardware trigger signal
Figure 8-26 The sequence diagram in falling edge trigger of Timed exposure mode
Avoid overtriggering in Timed exposure mode. If the Timed exposure mode is enabled, do not attempt to
send a new trigger signal while the previous exposure is still in progress. Otherwise, the trigger signal will
be ignored, and a FrameStartOvertrigger event will be generated.
b) TriggerWidth exposure mode
In TriggerWidth exposure mode, the length of exposure is determined by the width of the hardware trigger
signal. This function can meet the needs of users to change the exposure time of each frame of image.
If rising edge triggering is enabled, exposure starts when the trigger signal rises and continue until the
trigger signal falls, as shown in Figure 8-27
Hardware trigger signal
Figure 8-27 The sequence diagram in rising edge trigger of TriggerWidth exposure mode
If falling edge triggering is enabled, exposure starts when the trigger signal falls and continue until the
trigger signal rises, as shown in Figure 8-28
Hardware trigger signal
Figure 8-28 The sequence diagram in falling edge trigger of TriggerWidth exposure mode
Avoid overtriggering in TriggerWidth exposure mode. If the TriggerWidth exposure mode is enabled, do
not send trigger signals at too high a rate. Otherwise, trigger signals will be ignored, and a
FrameStartOvertrigger event will be generated.
The trigger signal width of the hardware triggering should not be shorter than the value of the
entered ExposureOverlapTimeMax(for more details please see section 8.3.22)parameter.
If TriggerWidth exposure mode is enabled:
Exposure
© China Daheng Group, Inc. Beijing Image Vision Technology Branch
Exposure
= Exposure Time
Exposure
8.Features
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