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MOBILITY DHH800-MFC CONFIGURATOR INSTRUCTION MANUAL
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7.0 HART
Communications with the Mobility DHH800-MFC
7.1
Overview
The Mobility DHH800-MFC Configurator with HART communications provides device specific HART
communication functions that allow the user to poll, configure and maintain supported HART field device.
The Mobility DHH800-MFC uses Universal, Common Practice and Device Specific commands to facilitate
communication with a HART field device. Use the Mobility MFC to commission devices, operational re-
configuration needs, or maintain devices through analog and sensor trim adjustments and many other
features.
The Mobility DHH800-MFC communicates with any HART device through Universal and Common Practice
Commands using the standard Generic DOF (Device Object File) but must have the DOF for a specific
HART device installed before it can execute Device Specific Commands. Consult the large and growing list
of available DOFs for an up to date list of HART devices with device specific support. Refer to the Available
DOF Website section of this document for information on accessing this list. When HART device support for
new devices becomes available, the Mobility MFC can be easily field updated via Internet downloads
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7.2
HART
Commands
Three HART command types are used by the Mobility DHH800-MFC to communicate with HART field
devices. First, Universal Commands are primarily used to identify a field device by its model number and tag
number and to read process data from the device. This communication is referred to as "polling". The
Mobility DHH800-MFC can poll any Hart Device. Second, Common Practice Commands are used for
calibration and maintenance functions that are common to many devices. An example of this would be trims
or adjustments for the devices' analog outputs. Third, Device Specific Commands are used to handle
functions that are unique to a particular device or manufacturer. Examples of these commands include
sensor zero, sensor trim, calibration curve characterization, density inputs required for calculations made by
the HART device or other configuration functions unique to the specific device.
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7.3
HART
Connections
HART connections are made using two standard banana jacks (3/4" center) located at the top end of the
Mobility DHH800-MFC. Refer to the following diagram. Polarity is not a concern for HART connections so
both jack collars are black. ABB supplies a HART lead kit (P/N 3KXD311800L0011) complete with mini-
grabber connections and a 250 Ω load resistor with each model Mobility DHH800-MFC.
For low load loops (less than 250 Ω), a 250 Ω resistor will need to be added to the loop to insure reliable
HART communications. ABB supplies a 250 Ω load resistor in the form of a standard adaptor (P/N
3KXD311800L0012). Refer to Figure 7-2 for connection details.
7-1
Figure 7.1 Mobility DHH800-MFC with HART
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HART
connections are standard banana jacks (3/4" center)
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