5
vacon • 50
Control unit
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
5.1.7
Bus termination of the RS485 connection
This dip switch is related to the RS485 connection. It is used for bus termination. The bus termina-
tion must be set to the first and to the last device on the network. This switch in position “0” means
that a termination resistor of 120 ohm is connected and the termination of the bus has been set.
This switch in the position “1” means that a pull-up and a pull-down resistors of 10 kOhm have been
connected for biasing purpose. The switch in the position “2” means no termination and no biasing
resistors have been connected. Factory default is 2. See Figure 34.
Figure 34. RS485 dip switch.
