Scope This part of ISO/IEC 10192 is one of a set of standards describing the characteristics of a specific home control system called the Home Electronic System, HES. This Standard specifies the characteristics of the Universal Interface Class 1 that connects devices to the home network in an HES for control applications. This Standard informs as to the usefulness of the principles of a UI and forms a basis for new work in this field. NOTE This Standard draws upon text from IEC 60870-5-1:1990 and IEC 60870-5-2:1992.