Baumer EXG50 Benutzerhandbuch - Seite 35

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6. Start-Stop-Behaviour

6.1 Start / Stop Acquisition (Camera)
Once the image acquisition is started, three steps are processed within the camera:
▪ Determination of the current set of image parameters 
▪ Exposure of the sensor 
▪ Readout of the sensor.
Afterwards a repetition of this process takes place until the camera is stopped.
Stopping the acquisition means that the process mentioned above is aborted. If the stop 
signal occurs within a  readout, the current readout will be finished before stopping the 
camera. If the stop signal arrives within an exposure, this will be aborted.
Special Case: Asynchronous Reset
The  asynchronous  reset  represents  a  special  case  of  stopping  the  current  acquisition. 
Thereby exposure is aborted immediately. Thus the current image is not read out and the 
image is upcasted.
This feature was introduced to accelerate the changing of image parameters.
6.2 Start / Stop Interface
Without  starting  the  interface,  transmission  of  image  data  from  the  camera  to  the  PC 
will  not  proceed.  If  the  image  acquisition  is  started  befor  the  interface  is  activated,  the 
recorded images are lost. 
If the interface is stopped during a transmission, this is aborted immediately.
6.3 Pause / Resume Interface
Pausing while the interface is operational, results in an interim storage of the recorded 
images within the internal buffer of the camera.
After resuming the interface, the buffered image data will be transferred to the PC.
6.4 Acquisition Modes
In  general,  three  acquisition  modes  are  available  for  the  cameras  in  the  Baumer  EXG 
series�
6.4.1 Free Running
Free running means the camera records images continuously without external events.
6.4.2 Trigger
The basic idea behind the trigger mode is the synchronization of cameras with machine 
cycles.  Trigger  mode  means  that  image  recording    is  not  continuous,  but  triggered  by 
external events.
This feature is described in chapter 4.6. Process Interface.
Asynchronous Reset:
For further information on
the timings of this feature,
please see the respective
data sheets.
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