Philips System4 Seriver Installation Instructions Manual page 22

• Sensitivity is the pixel value change required for the system to recognize motion. For example, suppose you set a
high Sensitivity level. If each pixel of video changes only a little bit (perhaps if it falls into a dim shadow),
recording is not triggered.
• Number of Frames between Reference allows the system to continuously create a new reference image to
compare future images to. For example, if a location being captured is becoming darker (perhaps if the sun is
setting), the system can reset its reference image every 50 images so that light-level changes that occur during that
time are not compared to drastically different light levels that were present more than 50 images earlier.
Setup Tab #6: Assigning Cameras to Alarms
The Alarm tab on the Setup page allows you to associate cameras with alarms and set up what should happen when
trigger events occur.
The System4 Server has the capability for 32 channels if two (2) multiplexers are configured. To name an alarm input,
select that alarm from the Alarm drop-down list. Alarms 1 through 16 correspond to the alarm inputs located on the
rear panel of the respective multiplexer(s). The drop-down list will show all alarms available on the System4 Server. If
only one multiplexer has been configured for this application, the sixteen (16) available alarms are labelled as System4
Server Alarm 1 through System4 Server Alarm 16. If the System4 Server has two (2) multiplexers configured, the
remaining sixteen (16) alarms are labelled as System4 Server Alarm 17 through System4 Server Alarm 32. After you
select the alarm input, click on its name in the Alarm field and enter a new name. No matter what you name the
alarm input, its input number reference will always appear in the box below the Alarm field.
To assign cameras to alarms:
1. Choose an alarm from the Alarm drop-down list.
2. Choose up to four cameras that should begin recording when the chosen alarm is activated. You can choose
each camera from the drop-down lists in the Assigned Cameras area. If you want to choose fewer than four
cameras, leave the remaining boxes on Ignore.
3. If the alarm is normally in a closed state—that is, if the alarm is triggered when the circuit is broken—choose
Normally Closed. Otherwise, leave this option unchecked.
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