Impedance setup for the speed dome
Each speed dome camera has a termination resistor built in.
In a network of
To set up the resistor correctly, installer must decide if the specific dome camera is the termination device or not, i.e. if it is at the end of the
The impedance setup is provided by the bit 1 and bit 2 of DIP switch DS3 .
DS3 
Bit 1 | Bit 2 | Impedance |
Open ( device on node ) | ||
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On | On | Standard 120 ohms ( device at end ) |
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For nodes: Set both of Bit 1 and Bit 2 to OFF position
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
Most keyboard and video server in market have
But most PC and notebook sort of devices have
Problems in practical connection
In some circumstances user adopts a star configuration in practical connection. The termination resistors must be connected to the two equipment that are farthest away from each other, such as equipment 1# and 15# in the following picture. As
the star configuration is not in conformity | with the requirements of |
. | . |
User’s manual | 14 |