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ALARMS OPERATIONS
There are two types of alarms; the alarms set by an external alarm trigger and the alarms set by a loss of the video signal.
EXTERNAL ALARMS
When external inputs such as a door bell, an interphone, etc.,
are connected to the CONTROL terminal (pins 1 – 4), they will
send alarm triggers automatically. On the monitor screen, the
alarm display will identify the camera corresponding to the alarm
trigger.
Example: If an alarm trigger is received for camera 4
(in 4 divisions split screen)
1 The buzzer is heard and the camera 4 indicator light.
The alarm output changes from HI (5V) to LOW (0V).
2 The image from camera 4 and the camera number (04)
will be displayed on monitor 1, EA (External Alarm) will
flash at the left of the camera number.
The action taken here will depend on the settings entered in
the (ALARM SET) menu (see page 25).
NOTE:
•
When the alarm operation is over, the display will return to
the mode preceding the alarm trigger.
•
An alarm trigger can also be received at a terminal for which
a camera is not connected to. In such a case, a grey screen
will be displayed and EA (External Alarm) and the
corresponding number will be displayed.
Resetting the Alarm
•
For an alarm in full screen display mode, press the
corresponding camera select button.
•
For an alarm in 4 division split screen display mode, press
the corresponding camera select button to switch to full
screen display mode then press the corresponding camera
select button one more time.
NOTE:
•
The alarm display mode on monitor 1 is selected according to
the settings entered in the (MONITOR SET) menu.
•
During normal monitoring operations the camera select
indicator lights according to the displayed camera. If there is
an alarm trigger for another camera, the indicator will flash.
VIDEO LOSS ALARM
If there is an interruption of the video signal, the buzzer is heard,
and the image just previous to the interruption is frozen
on-screen or color bars are displayed and “VIDEO LOSS” will
flash on-screen.
The action taken will depend on the settings entered in the
(VIDEO LOSS SET) menu (see page 32).
NOTE:
•
If a video signal is not present from the beginning, then “NO
VIDEO” will be displayed on a gray screen. This will not
trigger a video loss alarm.
•
The video loss alarm is recorded until the video signal is
restored.
Resetting the Alarm
•
For an alarm in full screen display mode, press the
corresponding camera select button, “NO VIDEO” will be
displayed on a grey screen.
•
For an alarm in 4 division split screen display mode, press
the corresponding camera select button to switch to full
screen display mode. Then, press the corresponding camera
select button one more time and “NO VIDEO” will be
displayed on a grey screen.
NOTE:
•
The alarm display mode on monitor 1 is selected according to
the settings entered in the (ALARM SET) menu.
•
During normal monitoring operations the camera select
indicator lights according to the displayed camera. If there is
an alarm trigger for another camera, the indicator will flash.
•
If the alarm is not reset, “VIDEO LOSS” will be displayed until
normal live picture signals are restored.
EA 04
External alarm Camera number
VIDEO LOSS
VIDEO LOSSVIDEO LOSSVIDEO LOSS
VIDEO LOSSVIDEO LOSS
(Color bars)
L8FH5/US (MPX-CD4 GB) 1999. 6. 4
34 English