Siemens SIMATIC FDE Gateway V1.1 Equipment Manual page 29

Wiring example
The following example from the SINAMICS G120 series shows the wiring between the
converter and the SIMATIC FDE Gateway.
Cable shield grounding:
RS232 serial cable should be shielded. The shield should be connected to functional
grounding at one end of the cable at least.
GND cable grounding:
Many masters do not have a shared connection. If this is the case, the RS232 ground should
reference the same functional grounding as the master (at a single point). If the master has a
shared connection, then the shared connection is connected with it and not connected to the
functional grounding.
Note
When connecting the converter consider the following in order to achieve better EMC
behavior:
• Use a shielded cable for RS232 communication between the converter and the device.
• Route the signal cable and the electric power cable separately in different cable ducts.
Note
It is not possible to use RS232 and RS485 at the same time.
SIMATIC FDE Gateway V1.1
Equipment Manual, 12/2023, A5E52683268-AE
Installing and connecting a device
5.10 Connecting the device
29