Avue Outdoor 36x with WDR Посібник користувача - Сторінка 6
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Друкувати сторінку4.INSTALLATION
RS-485Termination
Devices using Rs485 control are usually connected in daisy-chain. which reqiuers
termination with 120
resistor on both ends. Following picture illustrates the
Ω
connection methods. please note that a daisy-chain connection type shall not
exceed 7 meters.
RS 485+
RS 485-
120
Ω
Resistor
Device 1
Device 2
Device 3
The PTZ cameras provide integrated termination switch. It should be turned on
when the dome is installed as the last device. If the controller keyboard is used,
you need also to turn on the termination on it. please refer to the keyboard's
manual for details.
Termination
Termination
Termination
on
off
off
How to turn on termination on the high speed dome camera
The termination switch is located on the rear side of the connection board. For
switching on, you need to open the
rear side
3
2
1
Termination
Jumper
1
2
Jumper
Term. On
ON
ON OFF
7
OFF ON
Term. Off ( default)
Some products may not be available in your country, please contact our distributor for more details
120
Ω
Resistor
RS 485+
RS 485-
Termination on
How to open the connector board
The connector board can be easily
opened by holding the metal clip and
pull.
Metal
Clip holder
Press the metal
3
clip in and pull
the board on this
direction.
ON
Star-Connection
The star-form connection is mostly used. it enables the connection of different dome
cameras in longer distance. It is recommended to use RS-485 distributor to ensure the
telemetric data transmission:
RS-485 cable
up to 1000m
per channel
RS-485
Distributor
Termination
activated on
Termination on
every end.
Video Cable
coaxial cable with 75
Ω
impedance with copper conductor at center conductor, and
shielded with 95% copper. The following table shows different cable type and its
maximum length:
Cable standard
Max. Distance (m /ft )
RG 59 /U
229m / 750 ft
RG 6 /U
305m/ 1000 ft
RG 11 /U
457m / 1500 ft
If the cable length is more than 400 m, it is recommended to use optional
accessories, such as video amlifier or twisted-pair video converter , for boost
the video signal.
Up to 750m, coaxial cable
Video Amplifier
(optional)
Real time DVR Center
Extend connection distance with
video amplifier
Up to 1200m, twisted pair or cat.5 cable
transmitter
(optional)
Real time DVR Center
Extend connection distance with Twisted-Pair
video converter
Some products may not be available in your country, please contact our distributor for more details
4.INSTALLATION
The advantage of star-connection is
that every channel can work
independently and take a cable
length up to 1000 meters( depends
on cable quality). In case more
dome camera are installed, the star-
connection can be extended with
additional RS-485 distributors.
The values are for reference only.
Depends on the cable quality and
environmental condition, the
transmission distance might be less.
High Res Monitor
(optional)
(optional)
TP receiver
(optional)
High Res Monitor
(optional)
(optional)
8