Allen-Bradley 1794-IE8H, User Manual, Page: 105 / 146

Publication 1794-UM063A-EN-P - March 2006
Additional HART Protocol Information C-7
Universal Commands
Table C.5 Universal Commands
Command Data in Command Data in Reply
# Function Byte Data Type Byte Data Type
0 Read unique
identifier — None — 0 254 (expansion) —
1 Manufacturer
identification code
2 Manufacturer device
type code
(1)
3 Number of preambles
required
4 Universal command
revision
5 Device-specific
command revision
6 Software revision
7 Hardware revision
8 Device function
flags
(2)
(H)
9…11 Device ID number (B)
1 Read primary
variable — — — 0 PV units code —
1…4 Primary variable (F)
2 Read current and
percent of range — None — 0…3 Current (mA) (F)
4…7 Primary variable
3 Read current and
four (predefined)
dynamic variables — None — 0…3 Current (mA) —
4 PV units code
5…8 Primary variable
9 SV units code
10…13 Secondary variable (3)
14 TV units code
15…18 Third variable
19 FV units code
20…23 Fourth variable
6 Write polling
address 0 Polling address — — As in command —