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Appendix C
Additional HART Protocol Information
Table 4 - Common Practice Commands
Command
Data in Command
No.
Function
Byte
33
Read transmitter
variables
34
Write damping
0...3
value
35
Write range
0
values
1...4
5...8
36
Set upper-range
value (= push
SPAN button)
37
Set lower-range
value (= push
ZERO button)
38
Reset
'configuration
changed' flag
39
EEPROM control
0
40
Enter/exit Fixed
0...3
(1)
Current mode
41
Perform device
self-test
42
Perform master
reset
43
Set (trim) PV zero
44
Write PV units
0
45
Trim DAC zero
0...3
46
Trim DAC gain
0...3
47
Write transfer
0
function
48
Read additional
device status
49
Write PV sensor
0...2
serial number
50
Read dynamic
variable
assignments
68
(6)
Data
Type
None
Damping value
(F)
(seconds)
Range units code
Upper-range value
(F)
Lower-range value
(F)
None
(3)
EEPROM control code
Current (mA)
(F)
None
PV units code
Measured current (mA)
(F)
Transfer function code
Moved to Universal
Commands in HART
version 7.
Sensor serial number
None
0
1
2
3
Rockwell Automation Publication 1719-UM001C-EN-E - August 2018
Data in Reply
Byte
Data
0
Transmitter variable code for slot 0
1
Units code for slot 0
2...5
Variable for slot 0
6
Transmitter variable code for slot 1
7
Units code for slot 1
8...11
Variable for slot 1
12
Transmitter variable code for slot 2
13
Units code for slot 2
14...17
Variable for slot 2
18
Transmitter variable code for slot 3
19
Units code for slot 3
(7)
20...23
Variable for slot 3
As in command
None
As in command
As in command
None
As in command
See 48 in Universal Commands
As in command
PV transmitter variable code
SV transmitter variable code
TV transmitter variable code
FV transmitter variable code
Contained in
(6)
Type
Input
CIP MSG
Tag
(F)
(F)
(F)
(F)
(F)
(F)
x
x
x
x
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