Permissions for /dev/ttyS0

"Renaud (Ron) Olgiati" <renaud-9qJ39Kf4vhh95CE/QLhGvQK61p16E/[email protected]> Fri, 15 Apr 2011 12:34:12 -0400

Newsgroups	gmane.linux.mandrake.expert
Message-ID	<[email protected]>

The system keeps resetting those to 660, owner root.

How can I stop this, so a user can use the com port without having each time 
to su and chmod to 666 ?
 
TIA,
 
Ron.
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