Hart Protocol Menu
HART (Highway Addressable Remote Transducer) Protocol is the global standard for sending and receiving digital
information across analog wires between smart devices and control or monitoring system. HART is a bi-directional
communication protocol that provides data access between intelligent field instruments and host systems. A host can be
any software application from technician's hand-held device or laptop to a plant's process control, asset management,
safety or other system using any control platform. The HART protocol used on this gas sensor module has been developed
to comply fully with the HART specifications outlined by the HART Communication Foundation (HCF).
If the HART interface board has been provided with the gas sensor module, then HART will operate via the 4-20 mA
interface automatically. While no specific handheld device is necessary for HART operation, the gas sensor module does
comply with the HART standard so any handheld or PC-based HCF certified tool will work.
The information below provides the operator instructions on connecting HART and the HART Protocol Menu.
Common Practice Commands
The following Common Practice commands are implemented.
Command Number Byte Number Description
38 N/A Reset Configuration Changed Flag
48 0
Returns Module Status:
Module State - In Calibration(0x10)
(0x20 = cal passed)
(0x40 = cal failed)
Module State – Trouble(0x08)
Module State – Warming(0x04)
Module State – RUN (ALARM)(0x02)
Module State – RUN(0x01)
48 1
Returns Alarm Relay Status:
0x01 = Alarm Relay ON
0x02 = Warning Relay ON
0x03 = Both Relays ON
48 2 Returns Trouble Status (non-zero value indicates Trouble)
48 3 Status of Digital Input
48 4 Returns gas value used during calibration
48 5
Returns IT-Series Model Number:
0x28 = 5100-IT-28
Device Specific Commands
The Device Specific commands are used for accessing the unique features of the 5100-IT Series of gas sensor modules.
A response code of 0 indicates SUCCESS. This applies to all commands. As per HART specification, all command
responses will have a response code and status byte, plus any command specific data bytes as indicated in the following
tables.
SMC 5100-XX-IT Toxic Gas Detector Module 53
US 13 HART
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