RS-485 Extension 5 PortRS-485 Extension 5 PortCommunication Converter RS-485 Ethernet Converter RS-485 to USB Converter RS 485 Repeater/Splitter RS-485 Extension 5 Port What is RS-485 Extension 5 Port 2-Port RS-485 Extension (Modbus Protocol) 5-Port RS-485 Extension Supply input voltage: +10 to +28 VDC Supports Modbus RTU / Modbus TCP/IP.