Dahua HCVR8204A-S3, User Manual

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Here we use HCVR8216A-S3 as an example.
Figure 2-5
Please refer to the following sheet for detailed information.
SN Icon Name Note
1 VIDEO IN Video input port Connect to analog camera to input video
signal.
2 MIC IN Audio input port Bidirectional talk input port. It is to receive
the analog audio signal output from the
devices such as microphone, pickup.
3 AUDIO OUT
Audio output port
Audio output port. It is to output the
analog audio signal to the devices such
as the sound box.
4 AUDIO IN
Audio input port
It is to receive the analog audio signal
output from the devices such as
microphone.
5 RS-232 RS-232 debug COM. It is for general COM debug to configure
IP address or transfer transparent COM
data.
6 1
～
16 Alarm input port 1
～
16 
There are four groups. The first group
is from port 1 to port 4, the second
group is from port 5 to port 8, the third
group is from 9 to 12, and the fourth
group is from 13 to 16. They are to
receive the signal from the external
alarm source. There are two types;
NO (normal open)/NC (normal close).

When your alarm input device is
using external power, please make
sure the device and the DVR have
the same ground.
GND Ground
7 GND Ground
8 Power switch Power on/off button.