Siemens Simatic RTU303xC Series Operating Instructions Manual page 20

Application and functions
1.2 Configuration examples
Figure 1-4
Telecontrol with the IEC protocol
The following example contains a configuration with stations that communicate with the
master via the mobile wireless network and the Internet.
The connections between stations and master are via an OpenVPN server "SINEMA
Remote Connect".
20
Communication of the RTU with a DNP3 master station
Operating Instructions, 06/2019, C79000-G8976-C382-06
RTU303xC