Dahua D-IPC-HDW3449HP-AS-PV-0280B 빠른 시작 매뉴얼 - 페이지 7

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Port

Alarm I/O

1.2 Connecting Alarm Input/Output

The camera can connect to external alarm input/output device through digital input/output port.

Alarm input/output is available on select models.

Step 1

Connect alarm input device to the alarm input end of the I/O port. See Figure 1-2.

Device collects different states of alarm input port when the input signal is idling and

being grounded.

● Device collects logic "1" when input signal is connected to +3V to +5V or idling.

● Device collects logic "0" when input signal is grounded.

Step 2

Connect alarm output device to the alarm output end of the I/O port. The alarm output

is open-drain output, which works in the following modes.

● Mode A: Level application. Alarm outputs high and low level, and the alarm outlet

is OD, which requires external pull-up resistance (10K Ohm typical) to work. The

maximum external pull-up level is 12V, maximum port current is 300mA and the

default output signal is high-level (external pull-up voltage). The default output

signal switches to low- level when there is alarm output (As long as the operating

current is below 300mA, the output low-level voltage is lower than 0.8V).

● Mode B: Switch application. Alarm output is used to drive external circuit, the

maximum voltage is 12V and the maximum current is 300mA. If the voltage is

higher than 12V, please use an additional electric relay.

Table 1-2 Alarm information

Port Name

ALARM_OUT

ALARM_OUT_GND

ALARM_IN

ALARM_IN_GND

Figure 1-2 Alarm input

Description

Outputs alarm signal to alarm device.

When connecting to alarm device, only the

ALARM_OUT port and ALARM_OUT_GND port

with the same number can be used together.

Receives the switch signal of external alarm source.

Connect different alarm input devices to the same

ALARM_IN_GND port.

Quick Start Guide