Digital Video Recorder User Manual
2.3.2 Installing Sensor Alarm
The DVR has 4, 8, or 16 channel alarm input (depending on model) and
Alarm Input:
The alarm input is triggered by electric level (High: 5V, Low: 0V). Users can connect external sensors, like gas detector, smoke detector and infrared detector. Once the DVR detects that the electric level meets the setting user’s make, it will trigger DVR recording or alarm out.
For example, a sensor is connected to alarm input1. Cable A and B will be connected once the sensor detects an event. Users set Device type as NC (Normal Close). It will input +5V (high level) to input1 when events happen. DVR is triggered.
Fig 2.7 Sensor Connection
Alarm output:
The DVR has
Before alarm |
| After al arm |
| |
|
|
|
| |
| N O |
|
| N O |
|
|
| ||
|
|
| ||
| COM |
|
| COM |
|
|
| ||
| N.C. |
|
| N C |
|
| |||
Fig 2.8 Relay Output Status | . | |||
| ||||
Users need connect their alarm according to the NO or NC type of the alarm. One connection example as Fig 2.8
Fig 2.9 Alarm Output Connection
