USR-N668 is an 8 serial ports ethernet converter server which can realize data bi-directional transparent transmission between Ethernet and RS232/RS485/RS422 ports. Variety of serial ports is convenient for customers to use. It also supports AC220V power supply. Using ARM professor makes its low power consumption, fast and more stability. Features Two 10/100Mbps Ethernet port, support Auto-MDI/MDIX. 8 serial ports all support RS232/RS485/RS422. Support Static IP or DHCP. TCP Server, TCP Client, UDP Client, UDP Server, HTTPD Client . 8 serial ports all support two sockets ,and all can send data to two different servers when work as Client. It works as TCP client, supports to 16(max) TCP Client. Keep-alive & Registration-package. Modbus TCP to Modbus RTU. User-defined overtime Reload (no data reload)and overtime connection. The modifiable , one and only MAC. DNS domain name resolution ,user-defined DNS server address. Remote monitoring and remote firmware upgrading. Network time synchronization +RTC real time clock. User-defined Task Scheduler. Supports web server configuration. Supports V-COM. Reload by hardware and software. Run across gateways, switches and routers. Work in LAN or external network.