Siemens SIMATIC NET PROFIBUS - Manual (Page 172)

Active Components for RS-485 Networks
5-6
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
5.2 Possible Configurations with the RS-485 Repeater
Overview
The following section explains the configurations in which you can use the RS-485
repeater:
S Segment 1 and Segment 2 terminated on the RS-485 repeater (see Figure 5-3)
S
Segment 1 terminated on the RS-485 repeater and segment 2 connected
through on the RS-485 repeater (see Figure 5-4 )
and
S
Segment 1 and Segment 2 connected through on the RS-485 repeater (see
Figure 5-5 )
Terminating Resistor On/Off
Figure 5-2 shows the setting for the terminating resistor:
Terminating resistor
On: Terminating resistor
Off:
Figure 5-2 Setting of the Terminating Resistor