# man > ttyS(4)

[_ttyS_(4)](https://www.chedong.com/phpMan.php/man/ttyS/4/markdown)                               Kernel Interfaces Manual                               [_ttyS_(4)](https://www.chedong.com/phpMan.php/man/ttyS/4/markdown)

## NAME
       ttyS - serial terminal lines

## DESCRIPTION
       **ttyS[0-3] **are character devices for the serial terminal lines.

       They are typically created by:

           mknod -m 660 /dev/ttyS0 c 4 64 # base address 0x3f8
           mknod -m 660 /dev/ttyS1 c 4 65 # base address 0x2f8
           mknod -m 660 /dev/ttyS2 c 4 66 # base address 0x3e8
           mknod -m 660 /dev/ttyS3 c 4 67 # base address 0x2e8
           chown root:tty /dev/ttyS[0-3]

## FILES
       _/dev/ttyS[0-3]_

## SEE ALSO
       [**chown**(1)](https://www.chedong.com/phpMan.php/man/chown/1/markdown), [**mknod**(1)](https://www.chedong.com/phpMan.php/man/mknod/1/markdown), [**tty**(4)](https://www.chedong.com/phpMan.php/man/tty/4/markdown), [**agetty**(8)](https://www.chedong.com/phpMan.php/man/agetty/8/markdown), [**mingetty**(8)](https://www.chedong.com/phpMan.php/man/mingetty/8/markdown), [**setserial**(8)](https://www.chedong.com/phpMan.php/man/setserial/8/markdown)

Linux man-pages 6.7                          2023-10-31                                      [_ttyS_(4)](https://www.chedong.com/phpMan.php/man/ttyS/4/markdown)