GE Druck DPI 620-IS, User Manual

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[EN] English - K0460 HART
®
device operations 8-1
Chapter 8: HART
®
device operations
8.1 Introduction
The DPI 620-IS calibrator can be used to communicate with
devices that use the HART
®
protocol:
•
The Universal and Common Practice commands specified in
HART
®
revision 5 to 7.
This section includes procedures to use the HART
®
functions
available in the calibrator.
Before starting:
•
Read and understand the “Safety” section.
• Do not use a damaged instrument.
Note: Use only original parts supplied by the manufacturer.
8.2 About HART
• The HART
®
(Highway Addressable Remote Transducer) protocol
uses a digital signal on top of a standard 4 - 20 mA current loop
to get data to and from a HART
®
enabled field device. The
following are typical operations:
•
read the primary variable and the analogue output.
• read the device serial number, type and supplier.
•
get calibration data (upper and lower range values, sensor
limits, calibration date).
• do status and fault finding checks.
•
change the device configuration (range, units, damping).
One HART device (a master device) starts and controls the
communications with commands. The field device (a slave device)
uses each command to make a change and/or send data back.
Two master devices are permitted: a primary master (usually the
main control and monitor system), and a secondary master
(usually a hand-held communicator). The DPI 620-IS calibrator
operates as a secondary master.