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A.3
HART request and response data records
HART commands are processed on a channel-specific basis via a separate command interface
with one request data record and one response data record in each case.
Channel
0
1
2
3
4
5
6
7
Structure of request data records 80 to 94
Byte
0
1
2...239
"Request control" coding:
Bit 0...1:
Bit 2:
Bit 3...4:
Bit 5:
Bit 6:
Bit 7:
1
HART commands are processed by the I/O module in both transparent message format and
compact message format. However, the response data from the module is always made
available in transparent message format.
Processing of a sequence of HART commands as an SHC sequence affects all other channels
2
with HART activated.
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
Data record number
Request to the field device
80
82
84
86
88
90
92
94
Meaning
Request control
Number of preamble bytes
Communication data according to HART specifica‐
tion
Reserved = 0
0 = Parameters are not checked
Reserved = 0
0 = Transparent format
1 = Compact format
1 = Enable SHC mode
2
0 = HART Request
A.3 HART request and response data records
Response from the field device
81
83
85
87
89
91
93
95
1
HART operating data records
Comment
5...20, 255
97
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