In a system comprising a plurality of digitally addressable electronic devices, all devices have the same construction and are designed for being connected in series to a common central monitoring station. The addressing of these devices is accomplished by a plurality of address lines which are connected...http://www.google.ca/patents/US5065154?utm_source=gb-gplus-sharePatent US5065154 - Digitally addressble electronic device with interchanged and inverted address lines
