Does anyone know what the red wire on interconnected smoke detectors does when the alarm sounds? I know I could buy an interface box but that would be just plain wrong :) These are USA standard home smoke detectors with black and white wires for 120 VAC and a red wire for interconnection. Thanks, Bob --=20 http://www.fastmail.fm - Access your email from home and the web --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .