User`s manual

DigiMux
Basic Operations 33
BASIC ALARM FEATURES
The DigiMux is equipped with alarm processing to handle alarm inputs and outputs.
You can program DigiMux to react to alarm events that are activated by wired alarms,
video loss alarms, or motion detection alarms. The alarm function also increases the
level of recording detail of cameras that capture images of an event that triggers an
alarm (see
Increased Recording Detail on Alarmed Channel on page 35 for more
information).
Video Loss
A Video Loss alarm is triggered when the DigiMux cannot detect the video signal
from a camera channel that normally has a camera present. The default setting for
Video Loss alarm is ON. The following actions occur during video loss when the
Video Loss Detection feature is enabled in the Event Manager menu (see
Event
Manager on page 58):
1. Up to three output relays are activated (see Configuration Table on page 44 for
alarm output).
2. The internal buzzer starts beeping (if enabled).
3. The last image of the lost camera is frozen on the corresponding window on the
Main monitor. The word “LOSS” is displayed in the affected window. (To change
the affected camera’s display to a black cameo, press the affected Camera key, or
press Mode.)
4. The events are added to the Event List log (if enabled).
The above actions continue until the following conditions are met:
1. The video signal from the camera is restored.
2. The alarm duration time has elapsed.
Alarm In Event
An Alarm In event occurs when there is a contact closure or polarity change at any
alarm input pin. The inputs can be connected to any device equipped with either a
contact closure or TTL/CMOS standard output. The outputs can be connected to any
device, and can operate as a contact closure or TTL/CMOS standard device.
The following responses occur when an Alarm In pin is active, Alarm In is enabled for
the camera in the Configuration Table (see
Configuration Table on page 44), and
Alarm In is set to ON in the Event Manager menu (see Event Manager on page 58):
1. Up to three output relays are activated (see Configuration Table on page 44 for
alarm output).
2. The buzzer starts beeping (if enabled).