Establishing Communication With The Instrument - ABB LWT300 series User Manual

Establishing communication with the instrument

Communication with your instrument is achieved using the HART communication protocol over the
instrument's 4 – 20 mA current loop.
The HART (Highway Addressable Remote Transducer) communication protocol is a hybrid analog and
digital industrial automation protocol. It allows remote configuration of LWT instruments over legacy
4 – 20 mA analog device current loops, sharing the pair of wires used by analog-only host systems.
ABB provides a HART communication package. Once installed in your preferred HART application, it will
allow communication with your LWT instruments.
NOTICE
Cybersecurity disclaimer
The HART communication protocol used in the LWT series of instruments is
inherently insecure. It can be successfully exploited by spoofing techniques that
would allow access to instrument data and configurations. To prevent the use of
such techniques, always ensure that physical access to the instrument and network is
properly secured.
For cybersecurity reasons, ABB decided not to password protect the HART
communication protocol in LWT series instruments. As such, before implementation,
the intended application should be assessed to ensure that this communication
protocol is suitable.
NOTICE
The communication board for HART (located behind the interface board) cannot
be replaced in the field, and cannot be moved between LWT instruments. In case of
failure, the instrument must be sent back to ABB for calibration and repair.
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User Guide