The E1 brain board is an Ethernet-ready I/O and communication processor for digital I/O systems. Designed as a drop-in replacement for Opto 22's serial-based B1 brain board, the E1 supports both serial and Ethernet networking and multiple simultaneous protocols. The Optomux protocol is available over both serial and Ethernet; in addition, OptoMMP and Modbus/TCP are available over Ethernet.