Controlled over Ethernet using simple TCP/IP commands.

Relays - 20
Analogue Inputs (0-5v) - 8 
Power - 12V DC adaptor, supplied separately.
Configuration & Test interface - HTTP (webpage).
Control interface - TCP/IP over Ethernet. 
Relay current - Up to 16Amp @24vdc or 250vac 
Connections - Screw Terminals for N/O N/C and Common contacts.
Ethernet connection - 100mb full duplex

Full ETH8020 Documentation 

(Not version B, this is the original board)