KROHNE CORIMASS MFC 85 Interface EN - Manual (Page 9)

9
Classes of instruction and classes of conformity
UNIVERSAL
COMMANDS
COMMON
PRACTICE
COMMANDS
DEVICE
SPECIFIC
COMMANDS
Read Measured
Variable
Read Universal
Information
Write Standard
Parameters
Read Device-Specific
Information
Write Selected
Parameters
Read and Write
Entire Database
For slave devices, logical, uniform communication is provided by the following command sets:
Universal commands
understood by all field devices
Common practice commands
provide functions which can be carried out by many, though not all, field devices. Together,
these commands comprise a library of the most common field device functions.
Device-specific commands
provide functions which are restricted to an individual device, permitting special features to be
incorporated that are accessible by all users.
Examples of all three command sets can usually be found in a field device, including all
universal commands, some common-practice commands and any necessary device-specific
commands.
2.4 Hand-held Communicator
A standard HART
®
hand-held communicator may be used on Krohne equipment. The
operating instructions for this communicator is not supplied by Krohne and should accompany
the hand-held communicator when purchased.
A HART
®
Communicator is available from Krohne and may be purchased with all customer
requested DDL’s already downloaded to the instrument.
The Krohne CONFIG software package can also be supplied for HART
®
compatible
instruments. The functions are similar to that described in Sect. 1.4 (available end 1996).
Further information on HART
®
may be found in the HART
®
Field Communication Protocol
book available on request.
The Corimass MFC 081/085 HART
®
protocol is available from Krohne on request. Should you
require any further information, please contact your nearest Krohne office or Product
Management in Duisburg, Germany.