Digi One IA - Terminal Server.

Easy, reliable serial-to-Ethernet and Modbus-to-Modbus/TCP connectivity for
industrial automation applications. 

Digi One IA provides reliable, cost-effective network connectivity for serial devices.
This unobtrusive and easy-to-use serial server delivers serial-to-Ethernet connectivity to Programmable Logic Controllers (PLCs), Remote Terminal Units (RTUs), bar-code readers and other industrial devices.

Digi One IA supports most industrial automation protocols through TCP/UDP connections, serial bridging or COM port redirection using Digi’s patented RealPort® software.
RealPort enables existing applications to communicate with serial devices over the Ethernet. By creating a Modbus bridge, DIGI ONE® IA multiple Modbus/TCP masters can share Modbus serial slaves, or Modbus serial masters can access Modbus/TCP slaves.

Digi One IA is easy to install locally or remotely.
The IP address can be configured using DHCP, ARP-Ping or Setup, an application included with the installation CD that detects Digi One devices on the network.
Using the web interface, users can configure advanced functions into their application.