Appendix G. HART. Sierra Monitor Corporation 5100-04-IT, 5100-05-IT, 5100-03-IT, 5100-26-IT, 5100-10-IT, 5100-88-IT
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Appendix G. HART
Model 5100-XX-IT Toxic Gas Sensor Module
Figure 25: Wiring Connections Table
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Model 5100-XX-IT Toxic Gas Sensor Module
Figure 26: 4-20 mA Circuits Types 5100-XX-IT – Connections - HART
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Model 5100-XX-IT Toxic Gas Sensor Module
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 bidirectional 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
38
48
48
48
48
48
48
Byte Number
N/A
0
1
2
3
4
5
Description
Reset Configuration Changed Flag
Returns Module Status:
Module State - In Calibration
Module State - Trouble
Module State
– Warming
Module State - RUN (ALARM)
Module State
– RUN
Returns Alarm Relay Status :
0x01 = Alarm Relay ON
0x02 = Warning Relay ON
(0x10)
(0x30 = cal passed)
(0x50 = cal failed)
(0x08)
(0x04)
(0x02)
(0x01)
0x03 = Both Relays ON
Returns Trouble Status (non-zero value indicates Trouble)
Returns maximum gas value
Returns gas value used during calibration
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.
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Model 5100-XX-IT Toxic Gas Sensor Module
Device Specific Commands Summary
140
141
142
143
144
145
146
147
148
149
150
Command
Number
130
131
132
133
134
135
136
137
138
139
Description
Key Press
Set Alarm Level
Set Warning Level
Set Alarm Relay Action
Set Warning Relay Action
Reset Alarms
Abort Calibration
Set Calibration Gas Level
Apply ZERO Gas
Apply SPAN Gas
RESERVED
Force Gas Value
Reset Force Gas Value
Read MODBUS RTU Register
Set Transducer Serial Number
Set Calibration Mode output current
Set Trouble Mode output current
RESERVED
RESERVED
Set Gas Factor
Write MODBUS RTU Register
Command 130: Key Press
This command mimics the front plate key inputs.
Request Data Bytes:
Byte Format
0 Unsigned-8
Description
1=Enter
2=Down
4=Up
8=Menu
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Description
Returns same value as passed
Command 131: Set Alarm Level
Request Data Bytes:
Byte
0
Format
Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Description
Alarm level, range 0 to 60. Default is 60
Description
Returns new Alarm Level
Command 132: Set Warning Level
Request Data Bytes:
Byte
0
Format
Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Description
Warning level, range 0 to 60. Default is 20.
Description
Returns new Warning Level.
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Command 133: Set Alarm Relay Action
Request Data Bytes:
Byte Format
0 Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Model 5100-XX-IT Toxic Gas Sensor Module
Description
0=Latching (default)
2=Non-Latching
Description
Returns new Alarm Relay Action value
Command 134: Set Warning Relay Action
Request Data Bytes:
Byte
0
Format
Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Description
0=Latching
2=Non-Latching (default)
Description
Returns new Warning Relay Action value
Command 135: Reset Alarms
This command will reset any alarm relays that have been latched, providing the alarm condition is no longer present on the sensor.
Request Data Bytes: None
Command Specific Response Data Bytes: None
Command 136: Abort Calibration
This command aborts the calibration procedure.
Request Data Bytes:
Command Specific Response Data Bytes:
None
None
Command 137: Set Calibration Gas Level
Request Data Bytes:
Byte
0
Format
Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Description
Calibration Gas Level, range 0 to 100
Description
Returns new Calibration Gas Level
Command 138: Apply ZERO Gas
This command will signal the module to accept the present sensor output to as the ZERO gas condition.
Request Data Bytes:
Command Specific Response Data Bytes:
None
None
Command 139: Apply SPAN Gas
This command will signal the module to accept the present sensor output to as the SPAN gas condition.
Request Data Bytes:
Command Specific Response Data Bytes:
None
None
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Command 141: Force Gas Value
Request Data Bytes:
Byte
0
Format
Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Model 5100-XX-IT Toxic Gas Sensor Module
Description
Sets the Force Gas Value, range 0 to 100
Description
Returns new Force Gas Value
Command 142: Reset Force Gas Value
This command will signal the module to set the Force Gas Value to 0.
Request Data Bytes:
Command Specific Response Data Bytes:
None
None
Command 143: Read MODBUS RTU Register
This command allows the reading of sensor module data as defined in the MODBUS RTU register map.
Request Data Bytes:
Byte
0-1
Format
Unsigned-16
Description
Address of Requested Modbus Register
40001 = lowest address
65535 = highest address
Command Specific Response Data Bytes:
Byte
0-1
Format
Unsigned-16
Description
Returns contents of selected Modbus Register
Command 144: Set Transducer Serial Number
This command allows user to add a device specific serial number, if required. This is different from the serial number assigned by the Manufacturer.
Request Data Bytes:
Byte
0-2
Format
Unsigned-24
Command Specific Response Data Bytes:
Byte
0-2
Format
Unsigned-16
Description
Serial Number
Description
Returns new Serial Number
Command 145: Set Calibration Mode output current
Request Data Bytes:
Byte Format
0-1 Unsigned-16
Description
Current output required during calibration, in microamperes
Command Specific Response Data Bytes:
Byte
0-1
Format
Unsigned-16
Description
Returns new Calibration current value
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Model 5100-XX-IT Toxic Gas Sensor Module
Command 146: Set Trouble Mode Output Current
Request Data Bytes:
Byte Format
0-1 Unsigned-16
Description
Current output required to indicate Trouble, in microamperes
Command Specific Response Data Bytes:
Byte
0-1
Format
Unsigned-16
Description
Returns new Trouble current value
Command 149: Set Gas Factor
Request Data Bytes:
Byte
0
Format
Unsigned-8
Command Specific Response Data Bytes:
Byte
0
Format
Unsigned-8
Description
Sets the Gas Factor value, range 30-200
Description
Returns new Gas Factor value
Command 150: Write MODBUS RTU Register
This command allows the writing of sensor module data as defined in the MODBUS RTU register map.
Request Data Bytes:
Byte Format
0-1 Unsigned-16
Description
Address of Designated Modbus Register
40001 = lowest address
65535 = highest address
Data for Designated Modbus Register 2-3 Unsigned-16
Command Specific Response Data Bytes:
Byte
0-1
Format
Unsigned-16
Description
Returns MODBUS register value
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