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12
You can refer to the following sheet and Figure 1-8 for alarm input and output information:
Parameter
Grounding Alarm
Ground line
1, 2, 3, 4.
Alarm input 1 to alarm input 4. It becomes valid in low voltage.
NO C
A group of normal open activation outputs.
Rx,TX
This is the RS232 port to connect to the COM (debug), keyboard
port and transparent port (transfer COM input and output via the
network).
A/B
RS485 communication port. They are used to control devices such
as PTZ. Please parallel connect 120
T
Ω between A/B cables if there
are too many PTZ decoders.
T
1.8.2 Alarm Input Port
Please refer to the following points for more information:
4-channel alarm input. Normal open or Normal close type.
Please parallel connect COM end and GND end of the alarm detector (Provide external
power to the alarm detector).
Please parallel connect the Ground of the compact DVR and the ground of the alarm
detector.
Please connect the NC port of the alarm sensor to the compact DVR alarm input (ALARM)
Use the same ground with that of compact DVR if you use external power to the alarm
device.
Figure 1-9
1.8.3 Alarm Output Port
1-channel relay alarm output (NO contact). Provide external power to external alarm device.
To avoid overloading, please read relay parameters sheet in the
User’s Manual
carefully.
RS485 A/B cable is for the A/B cable of the PTZ decoder.
