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8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 96
Strobe
In this mode the camera sends a trigger signal to activate the strobe. The strobe signal is active low. After
receiving the trigger signal, the strobe signal level is pulled low. In global shutter mode and global reset
release shutter mode, the strobe signal low level lasting time is the sum of the exposure delay time and
the exposure time. In electronic rolling shutter mode, the strobe signal low level lasting time is the common
exposure time for all lines, and the strobe signal outputs only when the "exposure time > (image height -
1) * row period".
Trigger
Signal
Strobe
Signal
Signal2
Signal1
Exposure delay time
+ Exposure time
Signal3
Exposure delay time
+ Exposure time
Exposure delay time
+ Exposure time
Figure 8-4 Strobe signal schematic diagram (global shutter and global reset release shutter)
UserOutput
In this mode, the user can set the camera's constant output level for special processing, such as controlling
the constant light source or the alarm light (two level types are available: high level or low level).
For example: select line2 as the output line, the output source is selected as UserOutput1, and the output
value is defined as true.
"LineSelector" is selected as "line2", "LineMode" is set to "Output", "LineSource" is set to "UserOutput1",
"UserOutputSelector" is selected as "UserOutput1", and "UserOutputValue" is set to "true".
ExposureActive
You can use the "ExposureActive" signal to check whether the camera is currently exposing. The signal
goes low at the beginning of the exposure and the signal goes high at the end of the exposure. In electronic
rolling shutter and global reset release shutter modes, the signal goes high when the exposure of the last
line ends.
The electronic rolling shutter mode supports overlapped exposure and is in overlapping exposure mode
when the "frame period - exposure time ≤ readout time", at which time the "ExposureActive" signal is
always low.
Trigger
Signal
ExposureActive
Signal
Si gnal2
Si gnal1
Exposure
time
Si gnal3
Exposure
time
Exposure
time
Figure 8-5 Global shutter mode "ExposureActive" signal schematic diagram