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8.2
Acquisition Start/Stop Commands and Acquisition Mode
Executing an Acquisition Start command prepares the camera to acquire frames. You must execute an
Acquisition Start command before you can begin acquiring frames. Executing an Acquisition Stop command
terminates the camera's ability to acquire frames. When the camera receives an Acquisition Stop command:
If the camera is not in the process of acquiring a frame, its ability to acquire frames will be terminated
immediately.
If the camera is in the process of acquiring a frame, the frame acquisition process will be allowed to finish
and the camera's ability to acquire new frames will be terminated.
The camera's Acquisition Mode parameter has three settings: Single Frame, Multi-Frame and Continuous.
The use of Acquisition Start and Acquisition Stop commands and the camera's Acquisition Mode parameter
setting are related.
If the camera's Acquisition Mode parameter is set to Single Frame, after an Acquisition Start command has
been executed, a single frame can be acquired. When acquisition of one frame is complete, the camera will
execute an Acquisition Stop command internally and will no longer be able to acquire frames. To acquire
another frame, you must execute a new Acquisition Start command.
If the camera's Acquisition Mode parameter is set to Multi-Frame, after an Acquisition Start command has
been executed, exposure start can be triggered as many as specified by the Acquisition Frame Count
parameter. The camera will continue to react to exposure start trigger signals until the number of exposure start
trigger signals it has received is equal to the current Acquisition Frame Count parameter setting. At that point,
the camera will return to the waiting for exposure start trigger acquisition status and will remain in that status until
a new exposure start trigger signal is applied.
With Single Frame or Multi-Frame Acquisition Mode, if you execute another Acquisition
Start command while the camera is in the process of acquiring a frame, an error may occur.
If the camera's Acquisition Mode parameter is set to Continuous, after an Acquisition Start command has
been executed, exposure start can be triggered as desired. Each time an exposure start trigger is applied while
the camera is in a waiting for exposure start trigger acquisition status, the camera will acquire and transmit a
frame. The camera will retain the ability to acquire frames until an Acquisition Stop command is executed.
Once the Acquisition Stop command is received, the camera will no longer be able to acquire frames.
When the camera's Acquisition Mode is set to Single Frame, the maximum possible acquisition frame rate for
a given ROI cannot be achieved. This is true because the camera performs a complete internal setup cycle for
each single frame and because it cannot be operated with Trigger Overlap. To achieve the maximum possible
acquisition frame rate, set the Acquisition Mode to Continuous and Trigger Overlap to Readout.
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VA GigE series
RA14-131-003
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