A.6.3 HART job and response data records
HART commands are handled on a channel-specic basis using a separate command interface
with one request data record and one response data record each.
Channel Data record number
Request to the eld device Response from the eld device
0 80 81
1 82 83
2 84 85
3 86 87
Structure of the request data records 80, 82, 84, 86
Byte Meaning Comment
0 Request control
1 Number of preamble bytes 5…20, 255
2…239 Communication data according to HART specica‐
tion
"Request control" coding:
Bit 0…1: Reserved = 0
Bit 2: 0 = Parameters are not checked
Bit 3...4: Reserved = 0
Bit 5: 0 = Transparent format *
1 = Compact format
Bit 6: 1 = Enable SHC mode
Bit 7: 0 = HART request
* HART commands are processed by the I/O module in both transparent message format and
compact message format. However, the response data from the I/O module is always made
available in transparent message format.
Note
When "Number of Preamble Bytes" = 255, the number of preambles set with the parameters is
used. The default setting is ve. You can recongure the number of preamble bytes using the
HART-specic settings (see section HART-specic settings (Page 460)).
Structure of the response data records 81, 83, 85, 87
In case of response error
Byte Meaning Comment
0 Response control
1 HART group error display
Appendix
A.6 HART operating data records
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK 453
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