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The Pre-alarm record mode is the record mode for recording a pre-alarm events event for a specified time period before recording an alarm event. Pre-alarm record recording is performed at the "hot" record rate. If you don't specify the "hot" record rate is not specified, then the recording is performed at the standard record rate.

By default, the recording in this mode is disabled. To enable the pre-alarm recording, do the following:

1. Go to the Hardware tab in the System settings
dialog box (1)
2. window.
3. Select the Camera object corresponding to the
required
4. adjusted camera in the
objects
5. object tree
(2)
6. .
The settings panel for the selected object is displayed on the right of the Hardware tab.
8. Select
Go to
9. the Basic settings tab on the settings panel of the Camera object
(3)
10. .
    Image Modified
11. In the Pre-alarm record field, specify the
required interval (sec) of
12. time interval in seconds during which the pre-alarm
events recording (4)
13. event is recorded.
14. Click the Apply button
(5)
15. .

Information The table provides the information on pre-alarm recording options is given in the table.

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

If you specify a Specifying the long pre-record time, it can result in increasing the waste of running memory. Recommended The recommended pre-record time is not no more than 20s20 seconds.

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

• Frame size = Fragment size / 500.

The Note that the frame size is also depends on the percent of motion in the frame.

It is possible to You can count the size of the pre-record buffer for one camera it if the frame size is known:

• Size of pre-record buffer for one camera, MB = Pre-alarm record time, sec *

...

• Frame frequency in the

...

• Pre-alarm record mode, fps * Frame size, MB.

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

It is possible to use the following formula in case of If cameras perform pre-record recording with equal frame frequency, you can use the following formula:

• Size of pre-record buffer for all cameras in the system, MB = Number of cameras * Pre-alarm record time, sec * Frame frequency in the

...

• Pre-alarm record mode, fps * Frame size, MB.

Configuring video in the Pre-alarm record mode is complete.