Plugin for a low cost RS232 quad-relay. Enables control of motorized projector screen and/or window blinds.
See: http://forum.micasaverde.com/index.php/topic,8585.0.html
The relay is available at:
http://www.ebay.com/sch/r32190/m.html?_nkw=relay&_sacat=0&_odkw=relay&_osacat=0&_trksid=p3911.c0.m270.l1313