8.Features
© 2023 China Daheng Group, Inc. Beijing Image Vision Technology Branch 169
The MER-500-14GM/C-P, MER-500-14GM/C, MER-203-30GC-P-L, MER-203-30GC-P-L-F03
and MER-204-30GC-P-L-F02 cameras do not support this function.
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 an image frame data discarding event to the host, indicating that once image
discard event has occurred. So when you read the next frame, the image is not continuous.
The MER-203-30GC-P-L, MER-203-30GC-P-L-F03 and MER-204-30GC-P-L-F02 cameras do
not support this function.
8.6.3.
BlockNotEmpty Event
When the average bandwidth of the read-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 Frame Buffer not Empty 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.
The MER-203-30GC-P-L, MER-203-30GC-P-L-F03 and MER-204-30GC-P-L-F02 cameras do
not support this function.
8.6.4.
FrameStartOvertrigger Event
When the camera receives the hardware trigger signal or software trigger signal, if the front-end sensor is
exposing, it will not be able to respond to the new trigger signal, then the camera will send a trigger signal
overflow event to the host. Note that if multiple trigger signals are received within a frame period, the
camera sends only one trigger signal overflow event.
The MER-500-14GM/C-P, MER-500-14GM/C, MER-203-30GC-P-L, MER-203-30GC-P-L-F03
and MER-204-30GC-P-L-F02 cameras do not support this function.
8.6.5.
EventOverrun Event
Inside the camera, there has an event queue which is used for caching events. Usually, the event data
packet which is sent to the host only contains one event. When there are multiple events occur
simultaneously, or when the event transmission is delay, the user can use event queue inside the camera
to cache the events. When an event can be sent, the camera will send all the events cached in the queue,
at this time the event data packet which is sent to the host contains multiple events. But if the camera is
running in a high frame rate mode, and send a number of events that exceed the camera cache, at this
time, if the event queue overflow event is enable, the camera will send an event queue overflow event to
the host, and discard all the events in the current cache.
The MER-203-30GC-P-L, MER-203-30GC-P-L-F03 and MER-204-30GC-P-L-F02 cameras do
not support this function.
