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HART Communications
4.1 Universal HART Commands
F US Clamp-on Communications Protocol Manual
Hardware Installation Manual, 11/2015, A5E34981613-AC
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Table 4- 11 Command 12 - Read Message
Description
Byte
Format
Comments/Value
Message
0-23
Packed
<write Message CMD 17>
Table 4- 12 Command 13 - Read Tag, Descriptor, Date
Description
Byte
Format
Comments/Value
Tag
0-5
Packed
<write Tag CMD 18>
Descriptor
6-17
Packed
<write Descriptor CMD 18>
Date
18-20
Date
<write Date CMD 18>
Table 4- 13 Command 14 - Read Primary Variable Transducer Information
Description
Byte
Format
Comments/Value
Transducer Serial Number
0-2
U-24
Unique SN
Transducer Limits and Min Span Units
Code
3
Enum
PV Units Code
Upper Transducer Limit
4-7
Float
PV Upper Range Value
Lower Transducer Limit
8-11
Float
PV Lower Range Value
Minimum Span
12-15
Float
PV Span
Table 4- 14 Command 15 - Read Device Information
Description
Byte
Format
Comments/Value
PV Alarm Selection Code
0
Enum
01 = Low
PV Transfer Function Code
1
Enum
00 =- Linear
PV Upper and Lower Range Units Codes 2
Enum
< write units CMD 35 or 44>
PV Upper Range Value
3-6
Float
< write PV Upper Range CMD
35>
PV Lower Range Value
7-10
Float
< write PV Lower Range CMD
35>
PV Damping Value (sec)
11-14
Float
< write Damping CMD 34>
Write Protect Code
15
Enum
251-none
Reserved
16
Enum
250
PV Analog Value Flags
17
Bits
0
Table 4- 15 Command 16 - Read Final Assembly Number
Description
Byte
Format
Comments/Value
Final Assembly Number
0-2
U-24
<write FAN CMD 19>