Dell External OEMR 1435 User Manual page 132

Edit the file /etc/securetty, as follows:
Add a new line, with the name of the serial tty for COM1:
ttyS0
See the sample file, which shows the addition of the new line.
Table D-3. Sample File: /etc/securetty
vc/1
vc/2
vc/3
vc/4
vc/5
vc/6
vc/7
vc/8
vc/9
vc/10
vc/11
tty1
tty2
tty3
tty4
tty5
tty6
tty7
tty8
tty9
tty10
tty11
ttyS0
132
Serial Port Console Redirection