Siemens SIMATIC NET Installation Manual page 29

Communication Ports
4.2.2 RS485/422 Data Ports
2
1
1
2
3
4
5
6
Figure 4.5
20
3
4
RUGGEDCOM RMC30 Device With Built-In Termination
Common (Isolated Ground)
Negative
Positive
Shield to Earth (Connected At a Single Point)
RS485 Devices (32 Total)
Recommended RS485 Wiring
5
5
120Ω 10nF
6
RUGGEDCOM RMC30
Installation Manual, 04/2021, C79000-G8976-1008-10