Installation, Operation and Maintenance Manual
MDE 254 Rev. 1 March 2021
HART Command Set 15
Section 8: HART Command Set
Byte Format Description
None
Byte Format Description
None
Code Class Description
0 Success No Command-Specific Errors
1 - 5 Undefined
6 Error Device-Specific Command Error
7 Undefined
8 Warning Update Failure
9 - 15 Undefined
16 Error Access Restricted
17 - 127 Undefined
Byte Format Description
0 - 3 Float Primary Variable Loop Current (units of mA)
4 - 7 Float Primary Variable Percent of Range (units of percent)
Byte Format Description
0 - 3 Float Primary Variable Loop Current (units of mA)
4 Enum Primary Variable Units Code (see Section 8.4, Table 120)
5 - 8 Float Primary Variable
9 Enum Secondary Variable Units Code (see Section 8.4, Table 120)
10 - 13 Float Secondary Variable
14 Enum Tertiary Variable Units Code (see Section 8.4, Table 120)
15 - 18 Float Tertiary Variable
19 Enum Quaternary Variable Units Code (see Section 8.4, Table 120)
20 - 23 Float Quaternary Variable
8.1.3 Command #2: Read Loop Current and Percent of Range
This command reads the Loop Current and its associated Percent of Range.
Table 13. Request Data Bytes
8.1.4 Command #3: Read Dynamic Variables and Loop Current
This command reads the Loop Current and the four Dynamic Variables: the position request
(PV – Primary Variable), the actuator position (SV – Secondary Variable), the output torque
(TV – Tertiary Variable), the internal actuator temperature (QV – Quaternary Variable).
Table 16. Request Data Bytes
Table 14. Response Data Bytes
Table 17. Response Data Bytes
Table 15. Command-Specific Response Codes