Brainboxes es series ethernet to serial adaptors brainboxes es 357 ethernet 1 port rs232 1 port rs422485 10x screw terminals blocks perfect for industrial applications data transfer rates up to 1 000 000 baud coupled with 1mbits line drivers deliver uncompromising performance the es 357 provides simple instant networked serial portsa web interface allows secure configuration and control of the serial ports over a local network or the internet using any browser for windows the in hous