Newport Electronics (Santa Ana, CA) offers the third generation iServer3G. According to the company, it can connect any serial device RS-232, RS-485) to an Ethernet network or the Internet in minutes. The iServer3G can send notifications by email and has SNMP for remote management. The iServer can ake an existing Serial device a "node" on an Ethernet network with a unique IP address that's accessible from any authorized computer on the LAN, WAN, or Internet. It can also convert Serial Modbus to Modbus TCP/IP over Ethernet.
Check out www.newportus.com to learn more.