Just note to myself.
RS232 pins are on J1 (4pin header).. This info is nowhere on internet — it burned three of my boards trying to figure it out.
When looking upside down (lan ports are up and J1 is written backside down) — 1 – vcc (do not connect), 2 – TX, 3 – Ground, 4 – TX.
In linux do “screen /dev/ttyUSB0 38400″
Note: 38400 is baud rate!