1.2. HART ® DDL Device Description Language (DDL) is a language for modeling field device behavior. DDL allows applications (host) to configure, calibrate and troubleshoot field device problems without any prior knowledge of the devcie, providing full access to all properties and capabilities of any device compatible with HART protocol.
VMT-HART HART ® CONFIGURATOR FOR ANDROID DEVICES INSTALLATION, CONFIGURATION AND OPERATION MANUAL ______________________________________________________________________________________________________________________________ 10 Through text files called DD (Device Description, hosts can access the standardized specific device information, including variables, menus, commands and methods, also allowing to describe the structure and layout of menus user will see when communicating with the equipment. DD files are developed by the manufacturer of the device and allow menus, methods and parameters to be presented as manufacturer desires. Check "Installation" topic to learn how DDL is installed on VMT-HART and its directory structure. Visit www.vivaceinstruments.com.br to check which devices are integrated into the VMT-HART. DDL structure uses a group of elements. Each element has an essential role in the organization, data exchange and presentation of data to user, as described below Variable: Describes information about device parameters. For example measured value, operating parameters and information on the device. Typically, the device has a set of configuration variables relating to process and status variables used in methods. Menu: Describes a structure of how the variables, methods and sub-menus should be displayed. Typically, DDL presents a main menu and splits variables and methods in several submenus.