Brainboxes es series ethernet to serial adaptors brainboxes es 257 ethernet to serial device server providing access to two rs232 serial ports data transfer rates up to 1 000 000 baud coupled with 1mbits line drivers deliver uncompromising performance the es 257 provides simple instant networked serial ports a web interface allows secure configuration and control of the serial ports over a local network or the internet using any browserfor windows the in house designed 32 bit and 64 bi