Q-See QSTD2416, QSTD2408, QSTD2404 user manual Alarm Input, Alarm output, Installing Sensor Alarm

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 four-channel alarm output.

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 4-channel relay alarm output, which just gives on/off signal to external alarm. The status of these pin are illustrated as Fig. 2.7.

Before alarm

N. O.

COM

N. C.

After alarm

N. O.

COM

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