Dahua HCVR8204A-S3 - Alarm Input and Output Details

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3. How to connect PTZ decoder
a. Ensure the decoder has the same grounding with DVR, otherwise you may not
control the PTZ. Shielded twisted wire is recommended and the shielded layer is used
to connect to the grounding.
b. Avoid high voltage. Ensure proper wiring and some thunder protection measures.
c. For too long signal wires, 120Ω should be parallel connected between A, B lines on
the far end to reduce reflection and guarantee the signal quality.
d. “485 A, B” of DVR cannot parallel connect with “485 port” of other device.
e. The voltage between of A, B lines of the decoder should be less than 5v.
4. Please make sure the front-end device has soundly earthed.
Improper grounding may result in chip damage.
3.7.1 Alarm Input and Output Details
Important
Please refer to the specifications for the alarm input and output channel amount.
Do not merely count the alarm input and out channel amount according to the ports
on the rear panel.
Figure 3-1
1，2，3，4，5，6，
7，8，9，10，11，
12，13，14，15，16
ALARM 1 to ALARM 16. The alarm becomes active in low voltage.
NO1 C1，
NO2 C2，
NO3 C3，
NO4 C4,
There are four groups of normal open activation output (on/off
button)
NO5 C5 NC5,
There is one group of normal open activation output (on/off button)
CTRL 12V
Control power output of the 6
th
alarm output channel. Voltage
current: 500mA.
 When there is an alarm output, close the power output.
 When the alarm is cancelled, open the power output.
+12V
Rated current.
Voltage current: 500mA.
Ground cable.