The new IP relay HWg-ER02b replacing previous model. New is the Modbus/TCP protocol support, WEB config and two DI (Digital Inputs) for external dry contacts.
Ethernet relay, DIN rail, Web interface. Features 2x DI (dry contact input), full RS-232/485 serial port, and 2x DO (relay output, 230V/16A).
Controlled over the web or Modbus/TCP. Two IP relays connected back-to-back can extend (“tunnel”) the serial port and I/O over a LAN.
http://hw-group.us/cs/node/4348