Abstract: A digitally controlled electronic ballast, on command, optically transmits its identification signature or other data by CW modulation of the luminosity of one or more lamps connected to the ballast. The data is transmitted by momentarily interrupting the lamp current to mark the beginning and the end of successive periods, wherein the periods represent either a logic one or a logic zero in accordance with the data to be transmitted. Each ballast has a unique identification, which is included in the transmitted digital data. A receiver monitors the luminosity of a lamp and compares instantaneous luminosity to average luminosity to detect the beginning and end of each period.

Abstract: A refrigerant handling system includes a cabinet having two service ports and two sample ports and housing recycling/recharging apparatus coupled to the service ports and a refrigerant identifier coupled to one of the sample ports and coupled through solenoid-actuated valves to the recharging/recycling apparatus. Two coupling assemblies are provided for coupling the cabinet to the high-pressure and low-pressure sides, respectively, of an automotive air conditioner, each coupling assembly including a service hose with end couplers for respectively coupling to the air conditioner and one of the service ports and connected through solenoid-actuated valves disposed within a housing closely adjacent to the air conditioner coupler. Each coupling assembly also has a sample hose communicating with the service hose within the housing between the air conditioner coupler and the valves and having a distal end with a coupler for connection to one of the sample ports, and electrical conductors for control of the valves.

Abstract: A microprocessor controlled ballast includes a single front end and a plurality of inverters separately controlled by a single microprocessor. Lamps are operated in groups according to separate line inputs to the ballast. Total power is reduced to fifty percent or less if a line input is off.

Abstract: A microprocessor controlled ballast includes a single front end and a plurality of inverters separately controlled by a single microprocessor. Lamps are operated in groups according to separate line inputs to the ballast.