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5 Alarm Input /Output Device
Before device connection, pay attention to the following points:
Alarm Input
Confirm alarm type of alarm input device, and then match alarm type at network end of
decoder (for example, in case of grounding alarm, the decoder shall be normally open;
otherwise, it shall be normally closed).
Alarm input is effective in case of low electrical level, so the device can be grounded.
If the alarm device is connected to 2 decoders, or one decoder and other devices, use a relay for
isolation.
Alarm Output
The alarm output port of decoder cannot be connected to high-power load (less than 1A).
When constructing the output circuit, the excessive current should be prevented from causing
damage to the relay. Use a circuit breaker for isolation when applying high-power loads.
Pay attention to grounding of camera, since poor grounding might lead to chip damage.
Alarm input type can be NO (normal open) or NC (normal close).
Alarm Port 5.1
Diagram of alarm port Figure 5-1
Table 5-1 Alarm port introduction
Parameter Description
A, B Control A and B cables of RS-485 device.
Ground line port
IN1, IN2 Alarm input port
NO1; C1 Alarm output port (NO type)
Alarm Input Port 5.2
16-channal alarm input, which can be NO or NC.
Connect the NC port of alarm detector to alarm input port (ALARM) of decoder.
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