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Rockwell Automation Publication 1718-UM001A-EN-E - December 2019
Appendix C
Additional HART Protocol Information
Table 4 - Common Practice Commands
Command
Data in Command
Data in Reply
Contained in
No.
Function
Byte
Data
Type
(6)
Byte
Data
Type
Input
Tag
CIP MSG
33
Read transmitter
variables
None
0
1
2…5
6
7
8…11
12
13
14…17
18
19
20…23
Transmitter variable code for slot 0
Units code for slot 0
Variable for slot 0
Transmitter variable code for slot 1
Units code for slot 1
Variable for slot 1
Transmitter variable code for slot 2
Units code for slot 2
Variable for slot 2
Transmitter variable code for slot 3
Units code for slot 3
Variable for slot 3
(7)
(F)
(F)
(F)
34
Write damping
value
0…3
Damping value
(seconds)
(F)
As in command
(F)
35
Write range
values
0
1…4
5…8
Range units code
Upper-range value
Lower-range value
(F)
(F)
(F)
(F)
36
Set upper-range
value (= push
SPAN button)
None
None
37
Set lower-range
value (= push
ZERO button)
38
Reset
‘configuration
changed’ flag
39
EEPROM control
0
EEPROM control code
(3)
As in command
40
Enter/exit Fixed
Current mode
0…3
(1)
Current (mA)
(F)
As in command
41
Perform device
self-test
None
None
42
Perform master
reset
43
Set (trim) PV zero
44
Write PV units
0
PV units code
As in command
45
Trim DAC zero
0…3
Measured current (mA)
46
Trim DAC gain
0…3
(F)
47
Write transfer
function
0
Transfer function code
48
Read additional
device status
Moved to Universal
Commands in HART
version 7.
See 48 in Universal Commands
49
Write PV sensor
serial number
0…2
Sensor serial number
As in command
50
Read dynamic
variable
assignments
None
0
1
2
3
PV transmitter variable code
SV transmitter variable code
TV transmitter variable code
FV transmitter variable code
x
x
x
x