16
3.5.2 Connecting Video Output
Video output includes a BNC(PAL/NTSC1.0V
P-P
，
75
Ω
）
output ,a VGA output and HDMI output.
System supports BNC, VGA and HDMI output at the same time.
When you are using pc-type monitor to replace the monitor, please pay attention to the following
points:
z
To defer aging, do not allow the pc monitor to run for a long time.
z
Regular demagnetization will keep device maintain proper status.
z
Keep it away from strong electromagnetic interference devices.
Using TV as video output device is not a reliable substitution method. You also need to reduce
the working hour and control the interference from power supply and other devices. The low
quality TV may result in device damage.
3.6
Connecting Audio Input & Output, Bidirectional Audio
3.6.1 Audio Input
These series products adopt RCA port.
Due to high impedance of audio input, please use active sound pick-up.
Audio transmission is similar to video transmission. Try to avoid interference, dry joint, loose
contact and it shall be away from high tension current.
3.6.2 Audio Output
The audio output signal parameter is usually over 200mv 1K
Ω
(BNC). It can directly connect to
low impedance earphone, active sound box or amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to arouse squeaking. In
this case you can adopt the following measures:
z
Use better sound pick-up with better directing property.
z
Reduce the volume of the sound box.
z
Using more sound-absorbing materials in decoration can reduce voice echo and improve
acoustics environment.
z
Adjust the layout to reduce happening of the squeaking.
3.7
RS485
When the DVR receives a camera control command, it transmits that command up the coaxial cable
to the PTZ device. RS485 is a single-direction protocol; the PTZ device can’t return any data to the
unit. To enable the operation, connect the PTZ device to the RS485 (A,B) input on the DVR. See
Figure 3-1.
Since RS485 is disabled by default for each camera, you must enable the PTZ settings first. This
series DVRs support multiple protocols such as Pelco-D, Pelco-P.
To connect PTZ devices to the DVR:
1. Connect RS485 A,B on the DVR rear panel.
2. Connect the other end of the cable to the proper pins in the connector on the camera.
3. Please follow the instructions to configure a camera to enable each PTZ device on the DVR.
