update: I consider the unit bricked and will donate it to an open source enthusiast.
I'm trying to make sense of this serial connection on my Intel ss4000 nas (a better picture can be seen here).
The pin header has a whole in its casing on one side, and as far as I can tell from pictures on the internet the red line of this little cable should be on the right side, as in this picture:
cu -l /dev/ttyS0 -s 9600 cu -l /dev/ttyS0 -s 19200 cu -l /dev/ttyS0 -s 115200 cu -o -l /dev/ttyS0 -s 9600 cu -o -l /dev/ttyS0 -s 19200 cu -o -l /dev/ttyS0 -s 115200 screen -l /dev/ttyS0 9600 screen -l /dev/ttyS0 9600 8N1 screen -l /dev/ttyS0 19200 screen -l /dev/ttyS0 38400 screen -l /dev/ttyS0 115200
115200 should be the correct transfer rate.
If I connect the little cable with the red line on the left side (pin 9 of the header according to this blog) like in the below picture, then all of the above commands give me lots of garbage (at different speeds...) on the screen.
(*) The NAS does not respond to ssh or ping since the last 'aptitude update && aptitude upgrade' :(