Introducing Alarm Port; Alarm Input - Dahua DH-XVR4104C-X User Manual

Please make sure the front-end device has soundly earthed
Improper grounding may result in chip damage.

4.3.1 Introducing Alarm Port

The alarm input ports are dependent on the model you purchased.
Icon
1，2，3，4，5，6，
7，8，9，10，11，
12，13，14，15，16
NO1 C1, NO2 C2,
NO3 C3, NO4 C4
NO5 C5 NC5,
CTRL 12V
+12V
485 A/B
T+,T-,R+,R-

4.3.2 Alarm Input

Please refer to the following figure for more information.
Grounding alarm inputs which includes Normal open and 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 DVR and the ground of the alarm detector.

Please connect the NC port of the alarm sensor to the DVR alarm input(ALARM)

Description
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
There are four groups of normal open activation output (on/off button).
There is one group of normal open activation output (on/off button).
Control power output of the alarm output channel 6. Voltage current:
500mA.
When there is an alarm output, close the power output.

When the alarm is cancelled, open the power output.

Rated current.
Voltage current: 500mA.
Ground cable.
485 communication port. They are used to control devices such as
decoder. 120Ω should be parallel connected between A, B lines if there
are too many PTZ decoders.
Four-wire full-duplex RS485 port.
T+ T-: output wire.
R+ R-: input wire.
Figure 4-3
Table 4-1
Connecting Basics 33