Table of Contents
Advertisement
Impedance setup for the speed dome
Each speed dome camera has a terminator switch, which is set to OFF position as
the factory default.
In a network of RS485 chain, the devices (including console , cameras and other
RS458 devices in the network) are classified in two categories: end unit
and node
and #32)
To set up the resistor correctly, installer must decide if the specific camera is the
termination device or not, i.e. if it is at the end of the RS485 chain.
The impedance setup is provided by the bit 1 and bit 2 of DIP switch
Bit 1
Bit 2
--
On
On
For nodes:
For end unit: Set both of Bit 1 and Bit 2 to ON position
Impedance of the control unit
This is generally for two cases: controller with RS485, and controller with RS232.
Controller with RS485:
Most keyboard and video server in market have RS485, and are equipped with
terminator resistor to drive a RS485 system.
Controller with RS-232
Most PC and notebook sort of devices have RS232 or USB ports but no RS485.
Therefore, for PC system, a RS232 or USB to RS485 converter is needed.
Installer must check out if the converter has proper terminator resistor.
.
QMD Install manual D06400210010G PTZ Dome Camera
(#2 through #31). refer to chart in previous page.
DS3
--
Standard 120 ohms ( device at end )
Set both of Bit 1 and Bit 2 to OFF position
Impedance
Open ( device on node )
(unit #1
DS3
.
.
27
Advertisement
Table of Contents
