Siemens 7SR105 Rho - Page 103

7SR105 Rho Technical Manual
Chapter 4 - Page 10 of 70 © 2018 Siemens Protection Devices
To Control
System
2
3
4
1
RS485 Screened
twisted pair
Rear terminals
2
3
4
2
3
4
RS485 Screened
twisted pair
Rear terminals
Ext Wire loop
(terminating
resistance) added
where permanent
drive from master
station available
A
RS485
GND
B Term.
2 3 4 1
A
RS485
GND B Term.
2 3 4 1
A
RS485
GND B Term.
2 3 4 1
RS 485 Twisted pair Cable
To Control
System
Bus Termination Polarity
5V
B
A
GND
Fig. 2-2 Communication to Multiple Devices using RS485 (Standard Port)