Command Classification In The Hart; Protocol - Endress+Hauser iTEMP HART TMT162 Operating Instructions Manual

TMT162
Endress+Hauser
5.3.4

Command classification in the HART

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The HART protocol makes it possible for configuration and diagnostic purposes to transmit
measured and device data between the HART
HART ® masters such as the handheld module or PC-based operating programs (e.g.
FieldCare) require so-called device description files (DD = device descriptions, DTM), these
make it possible to access all information in a HART
information is done exclusively using "commands".
There are three command classifications:
• Universal commands
Universal commands are supported and used by all HART
example the following functionality:
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– Recognizing HART devices
– Readout of digital measured values
• Common practice commands:
These general commands offer functions that are supported or used by some but not all
field devices.
• Device specific commands
These commands enable access to device specific functions that are not HART
standardized. Such commands access, among other things, individual field device
information.
Chapter 6.4.2 contains a list of all HART
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protocol

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master and the respective field device.
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device. Transmission of such
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devices. Combined are for
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commands supported.
Operation
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