Dahua EW5541-AS Краткое руководство по эксплуатации - Страница 8
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Port
Port Name
ALARM_OUT
Alarm I/O
ALARM_IN
ALARM_GND
Connecting Alarm Input/output
Alarm input/output is available on select models.
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 the input signal is connected to +3V to +5V or idling.
Device collects logic "0" when the input signal is connected to the ground.
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 I/O port information
Function
Outputs alarm signal to alarm device.
Receives the switch signal of external alarm source.
Ground connection.
Alarm input
2
Mode A
Quick Start Guide