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1. Go to the Hardware tab in the System settings window.
2. Select the Camera object corresponding to the required camera in the objects object tree.
3. Go to the Basic settings tab on the settings panel of the Camera object.
   
4. In the Pre-alarm record field, specify the time interval (sec) of pre-alarm events event recording.
5. Click the Apply button.

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In Axxon PSIM,one can you can perform pre-alarm recording if the camera is disarmed. You can do it with the help of the DoReact("CAM","1","REC","rollback<1>") program; (see The Script object. Programming using the JScript language).

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To count the memory consumption, figure out the average size of the video signal frame. To do this, you must record the video fragment of 500 frames in length to the archive (maximum size, by default) and use the following formula:

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