Field bus
Two RS485 segments, and the parameters that have to agree.
Two independent RS485 segments, 9600–115200 Baud, half duplex, up to 10 m on twisted pair. Two segments means an inverter that insists on being alone on a bus does not block the meter.
Over Ethernet the same devices are usually reachable by Modbus TCP; RS485 is for the ones that are not.
What has to agree
Baud rate, parity, stop bits, slave address and register map all have to match what the device expects. The register maps for supported models ship with the firmware — that is what the compatibility list is describing.
Termination and biasing: whether the segments are terminated internally, and what to do at the far end of a long run. Needs an answer from hardware.
Adding a device: the actual screens — pick brand, pick model, set address, read back a live value to confirm. Needs UI screenshots.