Sofar with solarman data logger - do I also need an RS485->TCP converter?

[onetoomany]

I've just upgraded my inverter to a Sofar HYD5000. This came with a wifi datalogger "Solarman WiFi_Stick_LSW-3" - do I also need a RS485 device or should I be able to see my inverter on the network as-is?

2023-11-19 15:21:54.812 ERROR (MainThread) [pymodbus.logging] Connection to (192.168.1.28, 502) failed: [Errno 111] Connection refused
2023-11-19 15:21:54.812 WARNING (MainThread) [custom_components.solax_modbus.plugin_sofar_old] Sofar: attempt to read serialnumber failed at 0x2002

The logger requires a username and password to access, which I've not had to configure on the Modbus software.