Ultrak CCU-100HD User Manual page 61

While an alarm monitor is being used to display alarms, an operator cannot
manually switch another camera to the monitor.
EXAMPLE:
The alarm monitors are 3 through 5 with alarms 1, 2, and 7 displayed. Alarm
7 is the oldest alarm and alarm 1 is the newest. Alarm #4 occurs and cannot
be displayed so it is placed in the alarm queue.
Alarm 7 Alarm 2
Monitor 3 Monitor 4
Alarm 2 is acknowledged. The CCU shifts Alarm 1 to Monitor 4 and puts the
oldest alarm (alarm 4) in the queue on monitor 5.
Alarm 7 Alarm 1
Monitor 3 Monitor 4
Alarm VCRs
When an alarm occurs that calls a camera in alarm to an alarm VCR, the
CCU switches the camera to the first available VCR (video output
programmed as alarm VCR).
switcher to energize the relay (contact output) associated with that video
output.
If there are more alarms than alarm VCRs, the CCU puts the excess alarms
in a queue. When an alarm VCR becomes available, the CCU switches the
oldest alarm in the queue to the video switcher output associated with the
newly available alarm VCR.
Alarm 1
Monitor 5
Alarm 4
Monitor 5
The CCU sends control data to the HD
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