Establishing Communication With Host Systems; Device Description (Dd); Enhanced Device Description (Edd); Device Type Manager (Dtm) - Honeywell ST700 User Manual

2.3

Establishing communication with host systems

The transmitter establishes communication with the host systems using DD or DTM.

Device Description (DD)

DD is a binary file that provides the definition for parameters in the FBAP of the
transmitter. For example, DD refers to the function blocks that a transmitter contains, and
the corresponding parameters in the blocks that are critical to the interoperability of
Fieldbus devices. They define the data required to establish communications between
different Fieldbus devices from multiple vendors with control system hosts. The DD
provides an extended description of each object in the Virtual Field Device (VFD).
The Fieldbus Foundation provides the DD for all standard function blocks and transducer
blocks on a CD-ROM. The Fieldbus Foundation also provides this information on its
website, www.fieldbus.org.

Enhanced Device Description (EDD)

There are two types of EDDs are available, namely .ff5/.sy5 and .ffo/sym. The.ffo/.sym
binary files are generated for the legacy hosts to load the device DD that is generated using
latest tokenizer. Few constructs like Images that are supported in .ff5/.sy5 binaries, are not
supported in .ffo/.sym binary files.

Device Type Manager (DTM)

DTM is similar to a device driver that enables usage of devices in all the asset management
and device configuration software like FDM, with the help of the FDT-DTM technology.
The DTM has the following primary functions:
•
Provides a graphic user interface for device configuration.
•
Provides device configuration, calibration, and management features for the particular
device.
DTM provides functions for accessing device parameters, configuring and operating the
devices, calibrating, and diagnosing problems.
Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Page 7