Connecting Basics

This chapter introduces the typical connection diagrams and ports connections.

Typical Connection Diagram

Connecting to Video and Audio Input and Output

Video Input

The video input interface is BNC. The input video format includes: PAL/NTSC BNC (1.0VP-P, 75Ω).

The video signal should comply with your national standards.

The input video signal shall have high SNR, low distortion; low interference, natural color, and suitable lightness.

Guarantee the stability and reliability of the camera signal

The camera shall be installed in a cool, dry place away from the conditions such as direct sunlight, inflammable, and explosive substances.

The camera and the DVR should have the same grounding to ensure the normal operation of the camera.

Guarantee stability and reliability of the transmission line

Please use high quality, sound shielded BNC. Please select suitable BNC model according to the transmission distance.

If the distance is too long, you should use twisted pair cable, and you can add video compensation devices or use optical fiber to ensure video quality.

You should keep the video signal away from the strong electromagnetic interference, especially the high tension current.

Keep connection lugs in well contact

The signal line and shielded wire should be fixed firmly and in well connection. Avoid dry joint, lap welding, and oxidation.

Video Output

Video output includes a BNC (PAL/NTSC1.0VP-P, 75Ω) 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:

• To defer aging, do not allow the pc monitor to run for a long time.
• Regular demagnetization will keep device maintain proper status.
• 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.

Audio Input

This series of products audio input port adopt BNC 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.

Audio Output

The audio output signal parameter is usually over 200mv 1KΩ (BNC or RCA). 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:

• Use better sound pick-up with better directing property.
• Reduce the volume of the sound box.
• Using more sound-absorbing materials in decoration can reduce voice echo and improve acoustics environment.
• Adjust the layout of speaker and pickup to reduce squeaking.

Connecting to Alarm Input and Output

Please read the followings before connecting.

Alarm input

• Make sure alarm input mode is grounding alarm input.
• Grounding signal is needed for alarm input.
• Alarm input needs the low level voltage signal.
• Alarm input mode can be either NC (Normally Closed) or NO (Normally Open).
• When you are connecting two DVRs or you are connecting one DVR and one other device, use a relay to separate them.

Alarm output

The alarm output port should not be connected to high power load directly (It shall be less than 1A) to avoid high current which might result in relay damage. Use the contactor to realize the connection between the alarm output port and the load.

How to connect PTZ decoder

• Ensure the decoder has the same grounding with DVR; otherwise the PTZ might not be controlled. Shielded twisted wire is recommended and the shielded layer is used to connect to the grounding.
• Avoid high voltage. Ensure proper wiring and some thunder protection measures.
• 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.
• "485 A, B" of DVR cannot parallel connect with "485 port" of other device.
• The voltage between of A, B lines of the decoder should be less than 5V.

Make sure the front-end device has soundly earthed

Improper grounding might result in chip damage.

Introducing Alarm Port

The alarm input ports are dependent on the model you purchased.

Table 4-1

Alarm Input

Refer to the following figure for more information.

• Grounding alarm inputs which includes NO (Normally Open) and NC (Normally Closed) type.
• Parallel connect COM end and GND end of the alarm detector (Provide external power to the alarm detector).
• Parallel connect the Ground of the DVR and the ground of the alarm detector.
• Connect the NC port of the alarm sensor to the DVR alarm input (ALARM).
• Use the same ground with that of DVR if you use external power to the alarm device.

Alarm Output

• Provide external power to external alarm device.
• To avoid overloading, read the following relay parameters table carefully.
• RS-485 A/B cable is for the A/B cable of the PTZ decoder.

Alarm Output Relay Parameters

Refer to the actual product for relay model information.

Connecting to RS-485 Port