Technical data

Active components
4.1 Active components for RS485 networks
PROFIBUS Network Manual
72 System Manual, Edition 04/2009, C79000-G8976-C124-03
Terminating resistor on/off
the following figure shows the setting for the terminating resistor:
Terminating resistor
activated
Terminating resistor
NOT activated
on
on
Figure 4-3 Setting of the terminating resistor
Segments 1 and 2 terminated
The following figure shows how to connect the RS485 repeater to the ends between two
segments:
Segment 1
Segment 2
Terminating resistor
Bus segment 1
Terminating resistor
Bus segment
activate!
Terminating resistorTerminating resistor
Bus segment 2
activate!
Segment 1
Segment 2
R
Figure 4-4 Connection of two bus segments with an RS-485 repeater