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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).

Specifying the long pre-record time can result in increasing the waste of running memory. The recommended pre-record time is not no more than 20 seconds.

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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Size of pre-record buffer for one camera, MB = Pre-record time, sec * Frame frequency in the pre-record mode, fps * Frame size, MB.

General memory consumption in the pre-record mode is defined by the sum of values for each camera.

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