Brainboxes es series ethernet to serial adaptors brainboxes es 420 ethernet to serial device server with power over ethernet providing access to one rs422 485 serial port data transfer rates up to 1 000 000 baud coupled with 1mbits line drivers deliver uncompromising performance power over ethernet poe uses ieee 8023af standard compatible with any poe switchthe es 420 provides simple instant networked serial ports a web interface allows secure configuration and control of the seri