21
Name
Function
1–9
Alarm input 1~9, where 1~8 are local alarm input, 9 supports impulse.
C, NO
Outputs alarm signal to alarm device.
NO: represents normally open type.
C: Common alarm output port.
TX, RX
RS-232 serial port sender and receiver that connects to RS-232 port
Ground line
CTRL 12V
12V/0.75A output with switch control
A, B
RS-485 port that connects to speed dome with PTZ function.
2.5.2
Alarm Input Port
Both NO and NC are supported.
The GND of alarm detector is in parallel connection with COM (the power supply of alarm
detector should be from external power source). See Figure 2-26.
The GND of alarm detector is in parallel connection with GND of Device.
Connect the NC port of alarm detector to the alarm input port (ALARM).
When supplying power from external power source to the alarm device, the alarm device
should be common-grounded with the Device.
Normal closed alarm input illustration
