4.INSTALLATION
4.INSTALLATION
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.
RS485 Termination
Devices using RS485 control are usually connected in daisy-chain which
reqiuers termination with 120
resistor on both ends. The following graphic
illustrates the connection methods. Please note that a daisy-chain connection
type shall not exceed 7 meters.
Ω
120
Ω
R
esistor
Device 2
Device 3
Device 1
120
Ω
R
esistor
RS 485+
RS 485-
Some products may not be available in your country, please contact our distributor for more details
Some products may not be available in your country, please contact our distributor for more details
7
8
RS 485+
RS 485-
Termination on
Termination
on
Termination
off
Termination
off
Video Cable
Coaxial cable with 75
impedance with copper conductor at the center and shielded
with 95% copper. The following table shows different cable types and their maximum
length:
Ω
The values are for reference only.
Depending on the qualiy tof the cable and
environmental conditions the
transmission distance might decrease.
RG 6 /U
Cable standard
RG 11 /U
229m / 750 ft
Max. Distance (m /ft )
305m/ 1000 ft
457m / 1500 ft
RG 59 /U
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:
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.
Termination on
RS-485
Distributor
RS485 cable
up to 1000m
per channel
Termination
activated on
every end.
How to turn termination ON on the speed dome
The termination switch is located on the rear side of the connection board. For
turning it ON open theconnector board.
1
2
3
Term. Off ( default)
Term. On
1
2
3
ON
ON
OFF
OFF
ON
ON
Jumper
Termination
Jumper
rear side
How to open the connector board
The connector board can be opened
by holding the metal clip and pull.
Press the metal
clip in and pull
the board in the
outlined direction.
Metal
Clip holder
If the cable length is more than 400 m, it is recommended to use optional accessories,
such as video amlifiers or twisted-pair video converters , to amplify the video signal.
Video Amplifier
(optional)
Real time DVR Center
(optional)
High Res Monitor
(optional)
Up to 750m, coaxial cable
Extend connection distance with
video amplifier
TP receiver
(optional)
Real time DVR Center
(optional)
High Res Monitor
(optional)
Up to 1200m, twisted pair or cat.5 cable
Extend connection distance with Twisted-Pair
video converter
transmitter
(optional)
