Quick Start Guide
2
Table 1-2 Description of Alarm I/O Port
Port Name
Description
ALARM_OUT
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.
ALARM_OUT_GND
ALARM_IN
Receives the switch signal of external alarm source.
Connect different alarm input devices to the same
ALARM_IN_GND port.
ALARM_IN_GND
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.
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 +3 V to +5 V or idling.
●
Device collects logic "0" when input signal is grounded.
Figure 1-2 Alarm input
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 (10 K Ohm typical) to work. The maximum
external pull-up level is 12 V, maximum port current is 300 mA 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 300 mA, 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 12 V and the maximum current is 300mA. If the voltage is higher
than 12 V, please use an additional electric relay.
