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Appendix C
Additional HART Protocol Information
Table 1 - Response Codes and Field Device Status (Continued)
Response Code
Description
If Bit 7 is
And Bits
6...0 are
0
10
Applied Process Too Low - Lower Range Value Too Low - MultiDrop Not Supported
0
11
In MultiDrop Mode - Invalid Transmitter Variable Code - Upper Range Value Too High
0
12
Invalid Unit Code - Upper Range Value Too Low
0
13
Both Range Values Out of Limits
0
14
Pushed Upper Range Value Over Limit - Span Too Small
0
16
Access restricted
0
32
Device busy
0
64
Command not implemented
Table 2 - Field Device Status Bit Mask Definitions
Bit
Bit Mask
Definition
7
16#80
Device malfunction - The device detected a serious error or failure that compromises device operation
6
16#40
Configuration changed - An operation was performed that changed the device's configuration
5
16#20
Cold start - A power failure or device reset occurred
4
16#10
More status available - More status information is available via command 48, Read Additional Status Information
3
16#08
Loop current fixed - The loop current is being held at a fixed value and is not responding to process variations
2
16#04
Loop current saturated - The loop current has reached its upper or lower endpoint limit and cannot increase or decrease any further
1
16#02
Non-primary variable out of limits - A device variable not mapped to the PV is beyond its operating limits
0
16#01
Primary variable out of limits - The PV is beyond its operating limit
Table 3 - HART Universal Commands
Command
Data in Command
No.
Function
Byte
0
Read Unique
Identified
1
Read primary
variable
2
Read current and
percent of range
66
If no error was detected in the outgoing communication, the second byte
contains status information pertaining to the operational state of the field or slave
device.
IMPORTANT
Data in Reply
(1)
Data
Type
Byte
None
0
1
2
3
4
5
6
7
8
9...11
0
1...4
None
0...3
4...7
Rockwell Automation Publication 1719-UM001C-EN-E - August 2018
The 16# means this number is Hex display style.
Data
254 (expansion)
Manufacturer identification code
Manufacturer device type code
Number of preambles required
Universal command revision
Device-specific command revision
Software revision
Hardware revision
(2)
Device function flags
Device ID number
PV units code
Primary variable
Current (mA)
Primary variable %
Contained in
(1)
Type
Input
CIP
Tag
MSG
x
x
x
x
x
x
x
x
(H)
x
(B)
x
x
(F)
x
x
(F)
x
x
(F)
x
x
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