Q-See QSD6204 - Manual (Page 7)

B. DVR Rear Panel.
[Note] See “Chapter 4. Hardware Installation” for more details.
(1)
VIDEO OUT
Connect DVR to TV monitor using a RCA cable or BNC cable with RCA
adapter.
(2)
VIDEO IN (or CHANNEL IN)
Connect cameras to DVR. Each channel port indicates a single camera
connection. The DVR has 4 camera connection ports.
(3)
SENSOR
You can use this sensor terminal block to install up to 4 motion sensors into
the DVR. If you add the motion sensor devices to your DVR, the video
recording can be triggered by motion detection. Even though you do not
install motion detection hardware, you can utilize soft motion detection.
(Refer to Chapter 5, Section O-Sensor Setup)
(4)
ALARM
There is an alarm output terminal in case you need to install alarm devices.
(5)
AUDIO IN
Use this port to connect DVR to cameras that have a microphone function so
that you can record sound. There are two audio input ports.
(6)
AUDIO OUT
Connect DVR to “AUDIO IN” on your TV so that you can hear recorded
sound from TV speakers.
(7)
LAN
Using an Ethernet cable, connect the DVR to your computer or routing
device, such as a DSL modem or hub. The LAN (RJ-45) jack is for remote
viewing of the DVR via the Internet.
(8)
AC-DC POWER ADAPTER JACK
Connect the power adapter into the DVR and plug the power cable into the
wall. Some DVR models do not have a power adapter so you may not see this.
In case, just plug power cable from the behind of the DVR into the wall
(9) USB 2.0 PORT
Used to back up files to PC using PC Viewer software.
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