How to read Serial Port data

[Alvaro Rosales]

Hi guys, 
I am trying to write a program to control my Alcatel telephonic
central, this device has a  serial interfase that can be connected to
a computer serial port, I want to read all the data that the alcatel
device is sendind to my serial port
Can you tell me how can I redirect all the data that comes trough my
serial port to a file in FreeBSD?.
thanks in advance