The HART Communication Foundation manages a library of Manufacturer Device Descriptions, and provides regular updates to which any Foundation member can subscribe. The DD is written in conformance with a Device Description Language in the protocol. This describes the features and functions of a device, such as the form and content of menus and graphic displays to be presented in host computers or handheld devices. Key to the HART Protocol's ability to "get data out of the field device" is a data file called a Device Description (DD). This is a very robust method with roots in the Bell 202 Frequency Shift Keying (FSK) standard, which originally superimposed a digital communication signal "on top of" the 4-20mA current loop to bring Caller ID technology to the field of telephony. While the analog signal continues to provide primary values to and from field instruments, the digital signal provides additional device information. The HART Protocol provides two simultaneous communication channels on the same wire: 4-20mA “current loop” analog and a HART digital signal. For more information on the features and benefits of HART technology, please refer to the "About the HART Protocol" section of our website. In all these roles, HART technology has proven to be easy to use and very reliable. It can provide many benefits, including playing a major role in improving plant operations, increasing asset availability, reducing maintenance costs and aiding in regulatory compliance. These include device (re)configuration, diagnosing and troubleshooting instruments, reading values of additional measurements provided by the device, and much more. There are several reasons for using HART Communication to enhance the data flow between hosts and field devices. A host can be any software application from technician's hand-held device or laptop to a plant's process control, asset management, safety or other system using any control platform. Actually, it's not just a standard, but the global standard for sending and receiving digital information across analog wires between smart devices and host systems. The HART Communication Protocol (HART = Highway Addressable Remote Transducer) defines a bi-directional field communication protocol standard for instrument, control and automation systems. Which communication protocols does FDT Technology support? What is the main difference between DTM and DD configuration methods? Is the Generic HART DTM contained in the instrument or are the definitions located somewhere else? How can I use devices which do not have their own DTM? These FAQs have been compiled from HART Communication, PACTware, and FDT Group with some changes to fit the unique questions asked by our customers.Īdditional information and support for the HART Protocol can be found at the Romilly's HART and Fieldbus web site.
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