Vicon I-Onyx MP-955DN Specifikace stáhnout pdf (Strana 161)

152 • Configuring the ViconNet System XX112-36-00 Rev 909 Kollector Hybrid Network Digital Video Recorder

When Not to Use VMD

To conserve valuable hard drive space, it is recommended that the VMD mechanism be used to trigger

recording only when motion occurs. On a very active camera, however, this can result in a constant stream

of alarms and endless recording. This unending alarm state creates an enormous log of thousands of

entries displayed on top of the application. As this log only overwrites after 24 hours and uses a great deal

of system resources, potential delays could occur when clicking in any of the application menus. Therefore,

unless there is a true need for alarm notification upon motion, using the VMD alarm is not recommended for

very active cameras.

Instead, it is preferable to use the recording trigger setup options provided in the Devices Settings window,

as described in step 6 of the To configure/modify a local camera procedure, page 69. When all cameras are

programmed to your satisfaction, you must set them to auto record in order to begin recording. Using this

approach enables the Kollector to record video only when motion occurs within the selected grid you

programmed.

As the Kollector always records the time stamp, upon playback you will see the on-screen clock update

every second, even though the video does not refresh more than once every 20 seconds (when the device

takes a reference frame). For example, if you set a camera to record a clock and you mask out any motion

on the clock face itself (like the sweep secondhand on an analog clock, or the seconds display of a digital

clock), upon playback you will see the time stamp count every second, but the video of the clock will only

change every 20 seconds (the reference frame update). The time stamp that allows the recorder to show a

linear clock upon playback is a very small file and is considered negligible for hard drive usage. The

reference frame does not trigger recording; it writes one video frame to the hard drive and it does not show

up as a motion "hit" when doing a museum search.

Setting Pre/Post Alarms

The ViconNet system enables you to set pre alarms and post alarms, which instruct the system about what

to do immediately before and after an alarm event occurs on any device in the system. This enables you to

know what happened at a specific site immediately before and/or after an alarm event.

Post alarms are, in effect, a type of macro, but are activated only by alarm events as opposed to, for

example, a user-defined time schedule.

Configuring pre alarm settings consists of determining the duration that devices record prior to the alarm

and the quality of the saved data. If you configure post alarm settings, then when an alarm event occurs,

the system immediately begins recording the configured devices according to the indicated post alarm

duration and other settings.

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