Siemens SIMATIC NET PROFIBUS manual Segments 1 and 2 Terminated, Terminating resistor

Active Components for RS-485 Networks

Segments 1 and 2 Terminated

Figure 5-3 shows how to connect the RS-485 repeater to the ends between two segments:

Segment 1

Segment 1

Segment 2

R

Terminating resistor Bus segment 1 on

Terminating resistor

Bus segment 2

on

Segment 2

Figure 5-3 Connecting Two Bus Segments to the RS-485 Repeater

Segment 1 Terminated, Segment 2 Connected Through

Figure 5-4 shows the connection between two segments via an RS-485 repeater with one segment connected through:

Segment 1

Segment 1

R

Segment 2

Terminating resistor Bus segment 1 on

Terminating resistor Bus segment 2 off!

Segment 2

Figure 5-4 Connecting Two Bus Segments to the RS-485 Repeater

PROFIBUS Networks SIMATIC NET	5-7
6GK1970-5CA20-0AA1 Release 2 05/2000