power adapter optional; choose it carefully when purchasing!!!!! kit 1 includes one unit serial server dr302, no power supply included; kit 2 includes one unit serial server dr302+one power supply 5VDC; kit 3 includes only one 5VDC power supply, NO serial server dr302 included!! USR-DR302 Modbus RS485 to Ethernet converter can realize bidirectional transparent transmission between RS485 and Ethernet. Via web-page or software, rs485 to Ethernet Converter can realize serial data and TCP/IP data package transparent transmission. RS485 Port, Industrial Grade Standard DIN-rail mounting Modbus RTU to Modbus TCP Single RS485 to Ethernet converters,which can transmit data transparently between TCP/IP and RS485. RS485 to TCP IP is widespread required in industrial automation. USR-DR302 is a Din Rail RS485 to Ethernet Converter, which can transmits data transparently between TCP/IP and RS485. Via web-page or software, rs485 to Ethernet Converter can realize serial data and TCP/IP data package transparent transmission. Simple configuration and easy to use Compact, Light Weight Supports TCP server/client, UDP server/client, Virtual COM RS485 Port, Industrial Grade Standard DIN-rail mounting Modbus RTU to Modbus TCP single RS485 to ethernet converters,RS485 to tcp ip is widespread required in industrial automation.