Avue G40 User Manual - Page 6

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4.INSTALLATION
RS485 Termination
Devices using RS485 control are usually connected in daisy-chain which
reqiuers termination with 120
Ω
resistor on both ends. The following graphic
illustrates the connection methods. Please note that a daisy-chain connection
type shall not exceed 7 meters.
RS 485+
120
Ω
RS 485-
Resistor
Device 1
Device 2
Device 3
The speed dome series provide an integrated termination switch. It should be
turned ON on the dome serving as the last device. If a controller keyboard is
used, you also need to turn the termination ON on the keyboard. Please refer to
the keyboard's manual for details.
Termination
Termination
Termination
on
off
off
How to turn termination ON on the Dome
The termination switch is located on the rear side of the connection board. For
turning it ON open theconnector board.
Star-Connection
The star-form connection is a popular way to connect different devices. It enables
longer distance connection of different dome cameras. It is recommended to use
RS485 distributor to ensure the telemetric data transmission:
RS485 cable
up to 1000m
per channel
RS-485
Distributor
Termination
activated on
Termination on
every end.
7
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
The advantage of star-connection is
that every channel can work
independently and supports a cable
length up to 1000 meters (depending on
the quality of the cable). In case more
dome cameras are installed, the star-
connection can be extended with
additional RS485 distributors.
Video Cable
Coaxial cable with 75
Ω
impedance with copper conductor at the center and shielded
with 95% copper. The following table shows different cable types and their 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 amlifiersor twisted-pair video converters, to amplify the video signal.
Up to 750m, coaxial cable
Extend connection distance with
video amplifier
Up to 1200m, twisted pair or cat.5 cable
transmitter
(optional)
Extend connection distance with Twisted-Pair
video converter
Optional bracket accessories
The speed dome can be equipped with various bracket accessories for indoor and
outdoor installation. Please contact your distributor for further details.
Ceilling
Corner
Pole
mount
mount
mount
Some products may not be available in your country, please contact our distributor for more details
4.INSTALLATION
The values are for reference only.
Depending on the qualiy tof the cable and
environmental conditions the
transmission distance might decrease.
Video Amplifier
(optional)
High Res Monitor
(optional)
Real time DVR Center
(optional)
TP receiver
(optional)
High Res Monitor
(optional)
Real time DVR Center
(optional)
Wall
Wall mount
mount
8