Industrial Isolated RS-232 to 4 Channels RS-485 Active Hub. RS-485 Active HubThe I-7520U4 is isolated RS-232 to 4-ch RS-485 active star wiring hub, it has 4 independent RS-485 output channels and one RS-232 input channel. Each output channel is equipped with an individual driver. The data from a master to the input channel will simultaneously be forwarded to all the four output channels.Baud Rate SettingThe I-7520U4 provides 2 modes of baud rate ..