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Example
Example
Rev 1.00
There are two reset types that determine how events are cleared:
•
In automatic mode, the event is reset as soon as the input signal returns to inactive.
•
In timed mode, the alarm is active for the interval set. In this case, after the event timer
expires, the event must be deactivated before another timed mode alarm event can
be recognized.
If a door opening triggers an alarm event that lasts for 30 seconds, the event mode turns
off after 30 seconds, even if the door is still open. A timed alarm event cannot be triggered
again until the door is closed.
Text, alarm, and motion events can cause an event video clip to be recorded. An event
video clip records:
•
The starting time and date of the event
•
The type of event
•
The video images that were recorded during the event
If the video camera title was being displayed and/or a Text Insertion port was set to display
text when the video clip was recorded, that text is also recorded along with the event video
clip.
During video clip recording, the HRDV16 can record up to 60 fields per second (fps) for
NTSC or 50 fps for PAL. The HRDV8 can record up to 30 fps for NTSC or 25 fps for PAL.
Normally you set up each event so that the maximum recording rate is not exceeded during
a single type of event. However, there could be times when multiple events occur at the
same time. In that case, the HRDV16/8 may be sent a recording request that would cause
the maximum recording rate to be exceeded. As events occur, each event is placed in a
queue and recorded at the rate set for it in Setup mode. As the unit nears the maximum
number of fps, each additional event causes the maximum recording rate to be exceeded.
This causes the HRDV16/8 to drop the rate at which all currently active events are being
recorded. The benefit is that all active events are recorded, even if they are forced to record
at a slightly lower recording rate.
You are using a PAL system and a text event is detected that causes camera 1 to be
recorded at 25 fps. An alarm input causes camera 2 to be recorded at 25 fps. Then a motion
event is triggered that would normally cause camera 3 to be recorded at 20 fps, exceeding
the PAL maximum recording rate of 50 fps. The HRDV16/8 drops the recording rate of the
first two events to 12.5 fps and starts recording the third event at 12.5 fps. If further events
occur, the HRDV16/8 drops the recording rate, as needed, for all currently active events so
that there is some recording capacity available for the additional events.
To calculate how much disk space is required for storing event data, see
Space
Required, page 50.
59
HRDV Reference Guide
Calculating Disk
Document 900.0261
04/05
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