Installation, Operation and Maintenance Manual
MDE 254 Rev. 1 March 2021
HART Command Set 31
Section 8: HART Command Set
8.2.2 Command #54: Read Device Variable Information
This command reads the Transducer Serial Number, the Limits, Damping Value and Minimum Span of
the selected Device Variable along with the corresponding engineering units.
Table 79. Request Data Bytes
Table 80. Response Data Bytes
Byte Format Description
0 Unsigned-8 Device Variable Code (see Section 9.1)
Byte Format Description
0 Unsigned-8 Device Variable Code (see Section 9.1)
1 - 3 Unsigned-24 Device Variable Transducer Serial Number
4 Enum Device Variable Limits / Minimum Span Units Code (see Section 8.4, Table 120)
5 - 8 Float Device Variable Upper Transducer Limit
9 - 12 Float Device Variable Lower Transducer Limit
13 - 16 Float Device Variable Damping Value
17 - 20 Float Device Variable Minimum Span
21 Enum Device Variable Classification (see Section 8.4, Table 131)
22 Enum Device Variable Family (see Section 8.4, Table130)
23 - 26 Time Update Time Period
Code Class Description
0 Success No Command-Specific Errors
1 Undefined
2 Error Invalid Selection
3 - 4 Undefined
5 Error Too Few Data Bytes Received
6 Error Device-Specific Command Error
7 - 15 Undefined
16 Error Access Restricted
17 - 31 Undefined
32 Error Busy
33 - 127 Undefined
Table 81. Command-Specific Response Codes
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