The USR-DR134 is an ultra-small size serial server device with one serial port ^^ It can realize transparent transmission between RS485 and Ethernet ports. ^^ It supports timeout restart, DHCP, DNS and other advanced features such as heartbeat packet, registration packet etc. ^^ It can make it easy for data transmitting of the field serial device. ^^ One More Thing, Modbus Gateway Connect to PLC, SCADA system or users private server to achieve local or remote motoring.