March 2021
Installation, Operation and Maintenance Manual
MDE 254 Rev. 1
HART Command Set24
Section 8: HART Command Set
8.1.16 Command #18: Write Tag, Descriptor, Date
This command permits to write the Tag, Descriptor and Date into the field device. Only the Tag is
written here. The Tag and Long Tag are completely separate data items.
Table 53. Request Data Bytes
Table 54. Response Data Bytes
Byte Format Description
0 - 5 Packed Tag
6 - 17 Packed Descriptor used by the Master for record keeping
18 - 20 Date A Date Code used by the Master for record keeping
Byte Format Description
0 - 5 Packed Tag
6 - 17 Packed Descriptor
18 - 20 Date Date Code
Code Class Description
0 Success No Command-Specific Errors
1 - 4 Undefined
5 Error Too Few Data Bytes Received
6 Error Device-Specific Command Error
7 Error In Write Protect Mode
8 Undefined
9 Error Invalid Date Code Detected
10 - 15 Undefined
16 Error Access Restricted
17 - 31 Undefined
32 Error Busy
33 - 127 Undefined
Table 55. Command-Specific Response Codes
Code Class Description
0 Success No Command-Specific Errors
1 - 4 Undefined
5 Error Too Few Data Bytes Received
6 Error Device-Specific Command Error
7 Error In Write Protect Mode
8 - 15 Undefined
16 Error Access Restricted
17 - 31 Undefined
32 Error Busy
33 - 127 Undefined
Table 52. Command-Specific Response Codes