8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 85
8.6.1. ExposureEnd Event
If the ExposureEnd Event is enabled, when the camera's sensor has been exposed, the camera sends
out an ExposureEnd Event to the host, indicating that the exposure has been completed.
8.6.2. BlockDiscard Event
When the average bandwidth of the write-in data is greater than the average bandwidth of the read-out
data, the frame buffer may overflow. If the frame buffer is full and the camera continue to write image data
to it, then the new data will overwrite the previous image data which has been in the frame buffer. At this
moment, the camera sends a BlockDiscard event to the host, indicating that image discard event has
occurred. So, when you read the next frame of image, the image is not continuous.
8.6.3. BlockNotEmpty Event
When the average bandwidth of the write-in data is greater than the average bandwidth of the readout
data, if the frame buffer is not full, and there has image frame data in the frame buffer which has not been
send out completely, then before the new image frame is written to the frame buffer, the camera will send
a BlockNotEmpty event to the host, indicating that the previous image has not been send out completely
when the new image is written in the frame buffer.
8.6.4. FrameStartOvertrigger Event
When the camera receives the FrameTrigger external trigger signal or software trigger signal, if the front-
end sensor is exposing, it will not be able to respond to the new FrameTrigger signal, then the camera will
send a FrameStartOvertrigger event to the host. Note that if multiple FrameTrigger signals are received
within one frame acquisition period, the camera will send the corresponding number of
FrameStartOvertrigger events.
8.6.5. FrameBurstStartOvertrigger Event
When the camera is in FrameBurstStart trigger mode, when it receives an AcquisitionTrigger external
trigger or software trigger signal, if the front-end sensor is exposing, it will not be able to respond to the
new AcquisitionTrigger signal, and the camera will send a FrameBurstStartOvertrigger event to the host.
Note that the camera will send the corresponding number of FrameBurstStartOvertrigger events if it
receives multiple AcquisitionTrigger signals during the acquisition period of one frame of image.
8.6.6. FrameStartWait Event
When the camera is in FrameTrigger mode, the camera starts acquiring images, and if it does not receive
the FrameTrigger signal, the camera will send a FrameStartWait event to the host.
8.6.7. FrameBurstStartWait Event
When the camera is in the AcquisitionTrigger mode, the camera starts acquiring images. If the camera
does not receive the AcquisitionTrigger signal, the camera sends a FrameBurstStartWait event to the host.
Note that if the FrameTrigger mode is set to on simultaneously with the AcquisitionTrigger mode, the
FrameBurstStartWait event will be sent first. When the camera receives an AcquisitionTrigger signal, it will
send a FrameBurstStartWait event.
