Installation, Operation and Maintenance Manual
MDE 254 Rev. 1 March 2021
HART Command Set 39
Section 8: HART Command Set
8.3.1 Command #129: Write Device Variable Value
This command allows forcing the value of one variable.
Table 110. Request Data Bytes
8.3 Device Specific Commands
The following Device-Specific commands are implemented:
Table 109.
Table 111. Response Data Bytes
Byte Format Description
0 Enum Device Variable Code (see Section 9.1)
1 - 4 Device Variable Value
Byte Format Description
0 Enum Device Variable Code (see Section 9.1)
1 - 4 Device Variable Value
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 Illegal Device Variable Value
7 Error In Write Protect Mode
8 - 127 Undefined
Table 112. Command-Specific Response Codes
No. Command Description
129 Write Device Variable Value
130 Read Array
131 Write Array
If a master tries to write a read only variable, Response Code 7 (“In Write Protect Mode”) is generated.
NOTICE
If Loop Current Mode is active, Open Command (b0), Close Command (b1), Stop Command (b2),
Positioner Enabled (b4) in Device Variable Code 0 are always set to 0 even if No Command Specific errors.
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