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I am using Debian and if I add myself to the 'dialout' group I get the permission to use the device. I am not sure if this true for Red Hat, but worth a try. It might even be a different group; you can check what group uses /dev/ttyS? by typing in a terminal window ll /dev/ttyS?.
you could if you wanted to change the permissions set it to do so in /etc/rc.d/local.rc, and put your command in there on a new line it will be run as root anyway. Your probably better off however setting your user as part of the group, better security