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If you do not see the TCP and UDP Modbus servers in the External Communication tab, check the Software Package version in the “Type Label” tab. The version of the Software Package should be 02.81.01.R or later. If you are running an older version, use Sunny Explorer - Tools - Device Update to update the firmware on the SMA Sunny Boy.
The Venus-device should now automatically detect the PV inverter. If that does not happen, select Settings from the Device List, scroll down to “PV Inverters” and click on “Press to Scan” to “Find PV Inverters”.
It is possible that the Venus-device is not detecting the SMA PV inverter when it is dark so at least wait until it's light before further troubleshooting.
If the Venus-device is still not detecting the SMA PV inverter during daylight, verify that the Modbus TCP and UDP servers are running with Sunny Explorer. If that is the case, power cycle the SMA Sunny Boy and then check that the Modbus TCP and UDP servers are running after it has powered up again. If that is the case, use a computer running Windows, MacOS or Linux, open a terminal or Command Prompt and type (we're using 192.168.100.100 as the assumed IP address of the Sunny Boy here):
$ ping 192.168.100.100 PING 192.168.100.100 (192.168.100.100) 56(84) bytes of data. 64 bytes from 192.168.100.100: icmp_seq=1 ttl=64 time=0.896 ms 64 bytes from 192.168.100.100: icmp_seq=2 ttl=64 time=0.896 ms 64 bytes from 192.168.100.100: icmp_seq=3 ttl=64 time=0.896 ms
The above indicates that the Sunny Boy is responding to pings. Now repeat this from the Venus-device (you'll have to login on the Venus-device with SSH). If you see ping replies there too, you have confirmed that the Venus-device is able to communicate with the SMA Sunny Boy over the network. If you see timeouts instead of ping replies, you have to check the local area network connection and IP network configuration as that means that the Venus-device cannot reach the SMA Sunny Boy via the network.
Once you've confirmed that the Venus-device can communicate with the SMA Sunny Boy via the network can you proceed with the following test (do this on your computer; not on the Venus-device as that does not seem to work):
$ telnet 192.168.100.100 502 Trying 192.168.100.100... Connected 192.168.100.100. Escape character is '^]'.
If you see “Connected 192.168.100.100.” you have confirmed that the Modbus TCP server is running on the SMA Sunny Boy and is reachable via the network. If the “telnet” command remains stuck at “Trying 192.168.100.100” but you are able to ping the SMA Sunny Boy from the same machine, you might have a firewall enabled on the local network that is blocking access to the SMA Sunny Boy.