You can try these

#1--inside Forum

https://support.industry.siemens.com/forum/WW/en/posts/communicating-810d-with-pc-via-ethernet-port/53890/?page=0&pageSize=10#!#top

#2--Video

how to setting up DNC 840D PCU20(Ethernet)

AutoGen_b6890

Hey,

We're facing an issue as the CTX 310 should run on an isolated network, and the PCU20 network manager will be installed on a server, on a different subnet.

For this purpose, I urgently need to know what port / protocl should I open betweek the CTX 310 and the server, to be able to communicate with the PCU 20 network manager). 

I sadly find nothing on the documentation, someone able to help us ? 
Thanks