Dahua H Series Manuel de démarrage rapide - Page 8

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Port

Alarm I/O

1.2

Connecting Alarm Input/output

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

grounded.



Device collects logic "1" when input signal is connecting 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

relay switch output, which can only connect to NO alarm devices.

The ALARM_NO port and the ALARM_COM port with the same number constitute a switch

for alarm output. See Figure 1-3. The switch is open normally and closes when there is alarm

output.

Table 1-2 Alarm I/O port introduction

Port Name

ALARM_IN (pin1–pin3)

GND (pin4)

ALARM_NO1 (pin5)

ALARM_NO2 (pin7)

ALARM_COM1 (pin6)

ALARM_COM2 (pin8)

Description

Receives the switch signal of external alarm source.

Connect all the alarm input devices to the same GND

port.

Outputs alarm signal to alarm output device.

When connecting to alarm output device, only the

ALARM_NO port and ALARM_COM port with the same

number can be used together.

Figure 1-2

Alarm input

Quick Start Guide