Operation
Promag 50
64
Hauser
5.4.5
Universal and common practice HART commands
The following table contains all the universal commands supported by the device.
Command No.
HART command / Access type
Command data
(numeric data in decimal form)
Response data
(numeric data in decimal form)
Universal commands
0
Read unique device identifier
Access type = read
none
Device identification delivers information on the device and
the manufacturer. It cannot be changed.
The response consists of a 12 byte device ID:
– Byte 0: fixed value 254
– Byte 1: Manufacturer ID, 17 = E+H
– Byte 2: Device type ID, 65 = Promag 50
– Byte 3: Number of preambles
– Byte 4: Universal commands rev. no.
– Byte 5: Device-specific commands rev. no.
– Byte 6: Software revision
– Byte 7: Hardware revision
– Byte 8: Additional device information
– Bytes 9-11: Device identification
1
Read primary process variable
Access type = read
none
– Byte 0: HART unit code of the primary process variable
– Bytes 1-4: Primary process variable
Factory setting:
Primary process variable = Volume flow
!
Note!
• Manufacturer-specific units are represented using the
HART unit code "240".
• You can change the assignment of device variables to
process variables using Command 51.
2
Read the primary process variable
as current in mA and percentage
of the set measuring range
Access type = read
none
– Bytes 0-3: actual current of the primary process variable in
mA
– Bytes 4-7: % value of the set measuring range
Factory setting:
Primary process variable = Volume flow
!
Note!
You can change the assignment of device variables to process
variables using Command 51.
3
Read the primary process variable
as current in mA and four
dynamic process variables
Access type = read
none
24 bytes are sent as a response:
– Bytes 0-3: primary process variable current in mA
– Byte 4: HART unit code of the primary process variable
– Bytes 5-8: Primary process variable
– Byte 9: HART unit code of the second process variable
– Bytes 10-13: Second process variable
– Byte 14: HART unit code of the third process variable
– Bytes 15-18: Third process variable
– Byte 19: HART unit code of the fourth process variable
– Bytes 20-23: Fourth process variable
Factory setting:
• Primary process variable = Volume flow
• Second process variable = Totalizer 1
• Third process variable = OFF (not assigned)
• Fourth process variable = OFF (not assigned)
!
Note!
• Manufacturer-specific units are represented using the
HART unit code "240".
• You can change the assignment of device variables to
process variables using Command 51.
