Brainboxes es series ethernet to serial adaptors brainboxes es 457 ethernet to serial device server with power over ethernet providing access to two rs232 serial ports 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 switch the es 457 provides simple instant networked serial portsa web interface allows secure configuration and control of the serial po