Serial port on alix 3d3 using /dev/ttyS0

I am trying to use the serial port on the alix 3d3 using voyage 8.5
and am unable to talk to my device (an X10 home automation dongle)
using /dev/ttyS0. I search around and say this posting on the voyage
mailing list.

http://www.mail-archive.com/voyage-linux-59MrfjRBeRo6ThAmvYpkag <at> public.gmane.org/msg02928.html

I would like to know if anyone is able to use the DB9 serial port and
if /dev/ttyS0 is the right device. I checked /etc/inittab and the line
for getty on ttyS0 is commented out. Appreciate any clues.