8
3.2 EXTERAL
ALARM
There are three types of alarms that the system can be configured to handle. They
are Motion detection Alarm, External Alarm and Video Loss Alarm.
Motion detection Alarm and External Alarm:
When motion detection or External Alarm was triggered, there are 5 possible
actions will be taken.
a.
Changes recording speed as alarm recording speed.
b.
Monitor will display corresponding full screen alarm channel, it will switch
automatic mode to manual mode if buttons pressing activity occurred in 5 seconds.
c. Relays can be activated by motion detection or external alarm when turning
on.
d. External alarm will be recorded in the event list. Motion detection can be set
to yes or no.
e. The camera title will be transformed into color of yellow when motion is
happening, “ALARM” text will show up when external alarm is triggered.
Video Loss Alarm:
The default setting of Video Loss alarm is enabled and cannot be changed.
Although buzzer action can be disabled, an ALM record will still be added to the
Event List that indicates the precise time of video loss.
25 PIN D-Sub connector is used for external alarm input. It will accept TTL/CMOS
type trigger signals where the
8ch & 16ch DVR
alarm inputs will be set by signal
polarity. It also accepts contact type devices. For example, N.O. relay input, the
Alarm Polarity should set to LOW in the ALARM SETUP menu. For N.C. relay
input, the Alarm Polarity should set to HIGH in the ALARM SETUP menu.
Connector pins 1-16 are for TTL/CMOS compatible alarm signals or for connect
one side of the contact type devices. Connector pins 20-21 are for input signal
grounding or the remaining side of the contact type devices.
The alarm hold input accept TTL/COMS alarm signal as well as contract device.
The connector pin 22 connected to Alarm Reset. The Alarm Reset signal return
connects to ground pin (pin 20-21).
Alarm output is Relay Type, Pin 23 is Normal Close and Pin 25 is Normal Open.
These outputs can be used to control external devices.
