Baumer EXG Manuale d'uso - Pagina 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.