US Patent 7869904 Utility load control management communications protocol

A method for managing a utility load by controlling electrical consumption of electrically powered devices. The method includes selecting a target for load control forming a single variable length load control message according to a communication protocol. The load control message includes the target address and a plurality of unique concatenated command messages, each of the plurality of unique concatenated command messages being selected from the set consisting of a command message having a predetermined message type and a fixed length message defined for the predetermined message type and a command message having a predetermined message type and a variable length message corresponding to values in a command message control flag field defined for the predetermined message type. The method also includes causing the single variable length load control message to be transmitted to the target and receiving a reply message formed according to the communication protocol from the target.