NETWORK GATEWAYS are used for Telnet type of connections.
They are typically used for Receivers/Preamps, Projectors, some lighting controllers like Lutron RA2.
When setting up the NETWORK GATEWAY you will need to know the PORT NUMBER and IP NUMBER. You can leave the Username and Password fields blank if your device does not require that information to be passed in.
Lutron RA2 requires Username and Password, so once you put in the Username and Password in the fields in the gateway, that information will automatically be passed in as part of establishing the connection.