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6.2.1. Granting access to the serial port

If the serial port cannot be accessed, the most probable reason is that the serial port device node does not

have read/write permissions for standard users.

To print the serial port permissions open a console and execute the ls command, specifying the actual

serial port device node in place of /dev/ttyS0.

$ ls –l /dev/ttyS0

crw------- 1 root dialout 4, 64 2007-03-26 08:37 /dev/ttyS0

The ls command lists the owner (root), group (dialout), and permissions (crw-------) of the serial port

/dev/ttyS0. The serial port permissions are organized as follows:

To make the serial port accessible to every user, add read/write permissions for the Group and Others.

Open a console and execute the chmod command, as root, specifying the actual serial port device node

in place of /dev/ttyS0.

# chmod 666 /dev/ttyS0

Kubuntu distribution does not usually have a 'root' user. To execute

commands as root you need to prepend the 'sudo' command to the

command you want to execute. Example: 'sudo chmod 666 /dev/ttyS0'.

You can also permanently work with root permissions by executing the

command 'sudo –s'.

This command grants read/write access to the serial port for every user. Check the new permissions with

the ls command:

$ ls –l /dev/ttyS0

crw-rw-rw- 1 root dialout 4, 64 2007-03-26 08:37 /dev/ttyS0

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