Dahua H Series Panduan Memulai Cepat - Halaman 8
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Halaman Cetak
No.
Port Name
4
DC 12V
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
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.
Mode C: Switch application. If the voltage is higher than 12V, use an additional electric
relay. Note that a diode needs to be connected to the relay, for protection against
voltage transients.
Description
Inputs 12V DC power. Be sure to supply power as instructed in
the manual.
Device abnormity or damage could occur if power is not
supplied correctly.
Figure 1-2
2
Alarm input
Quick Start Guide