Model 5100-28-IT Combustible Gas Sensor Module
Page: 38
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
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.
Byte Number Description
38 N/A Reset Configuration Changed Flag
48 0 Returns Module Status
Module State - In Calibration (0x10),
(0x30 = cal passed)
(0x50 = 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 Returns maximum gas value
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
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.
Device Specific Commands Summary
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