Example for RedHat 7.2
======================
1. On the linux host
add the following entry to /etc/inittab
dt1:345:respawn:/sbin/agetty 9600 ttyS0 vt100
dt2:345:respawn:/sbin/agetty 9600 ttyS1 vt100
note uppercase S in ttyS1.
where ttyS0 => COM1
9600 => is the line speed
vt100 => is the terminal type
2. Reload inittab by
# telinit q
3. On the PC, start the terminal emulation software and set it to
connect at 9600 8N1 to COM1 using null modem (direct cable
connection)