I'm in the process of building an ESS system. I have not installed the Multiplus as it has not been delivered yet. I have installed 2 EM24 and connected the Cerbos GX to the network and the energy meters. The second one is configured to Modbus ID 2. To make sure the connectivity is fine, i wrote a small program for Linux to read out modbus registers from the EM24 and that works fine.
Should the Cerbos show the meters or does it work only after configuring ESS on the Multiplus and connecting the Multiplus ? The serial to USB adapter (tried the original FTDI and a CH340 one) are detected by the GX.