It sounds very doable to do an M-Bus implementation. If you want help with specifics, give me a private buzz. Gus Calabrese. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ WFT Electronics wft@frii.com http://www.frii.com/~wft Gus Calabrese 303 321-1119......voicemail Lola Montes 1799 Uinta Street Denver, CO 80220 EMERGENCY: 791 High Street Estes Park, CO 80517 if no success with wft@frii.com, try .... wft@bigfoot.com