19
1st
2nd
3rd
4th
Assuming there is a sequence
of 6 received alarmed videos
5th
1st
2nd
3rd
1st
2nd
4th
1st
Monitor
2nd
Monitor
3rd
Monitor
1st
Monitor
2nd
Monitor
3rd
Monitor
The first 3 alarmed videos are displayed
across the 3 alarm monitors in a sequential
order, while the subsequent are queued to
be displayed.
When the 3rd alarm is cleared
from the 3rd monitor, the 4th
alarm, which is the next alarm
in the que, is then displayed on
the 3rd monitor and the 5th
alarm becomes the next alarm
in the que.
Alarmed video that is
displayed and held on
the monitor
Alarmed video that is
queued to be
displayed
4th
5th
5th
6th
6th
6th
Figure 4-4
5.
Dual/Hold and Sequence
Two alarm monitors are used here: the 1st alarmed video is
displayed on the Hold monitor, and all subsequent alarmed
videos are queued and sequenced to the Cycle monitor with a
Dwell Time of 2 seconds. Once the Hold monitor has been
cleared of the displayed alarm, the next alarmed video in
queue will be sequenced to it, and meanwhile, removed from
the Cycle monitor. See the following example of 4 alarmed
videos received.
Hold
Monitor
Cycle
Monitor
1st
2nd
3rd
4th
1st
2nd
3rd
4th
Sequence of 4 received alarmed videos
Display cycle on the Cycle monitor when the
1st alarmed video is displayed and held on the
Hold monitor
Hold
Monitor
Cycle
Monitor
2nd
3rd
4th
Display cycle on the Cycle monitor when the
1st alarmed video has been cleared and the
2nd video is displayed and held on the Hold
monitor
Alarmed video that is
displayed and held
on the monitor
Figure 4-5
Dual-Monitor Modes
Three Dual-Monitor modes can be used, these include: DHI/DSI,
DHA/DSA and DHM A/DSM. Any of these modes features two
monitors operating in pair: if Monitor 1 is armed, Monitor 2 will be
automatically armed to cooperate with Monitor 1. Please refer to
Monitor Arming Types
(
Section 4.7.3
) for details.
Display Indicator
When the system receives an alarm input, the on-screen Status Line
displays an "ALARM" message until the alarm is removed or the
alarm contact is switched open.
4.7.2 Alarm Clearance Methods
V2015A provides three Alarm Clearance methods, Instant Clear,
Auto Clear and Manual Clear. All the three methods will remove
alarm contacts from the system, and restore the monitors back to
normal operation.
1.
Instant Clear
(contact-following alarm clearance)
An alarm is cleared when the alarm contact is switched open.
In this method, open the alarm contact first, and then close it to
re-arm the contact.
2.
Auto Clear
(automatically acknowledged by the system 20
seconds after the contact is switched open)
In this method, the system will automatically clear the alarm 20
seconds after the alarm contact is switched open.
3.
Manual Clear
(manual keyboard acknowledgement)
In this method, operator clears an alarm only by manual
keyboard operation.
Note:
In Dual/Sequence mode, a monitor must be pre-selected for
alarm clearance.
4.7.3 Monitor Arming Types
18 Monitor Arming Types (detailed in the following table) are
provided for system arming. The last three are auxiliary arming
types.
