Endress+Hauser PROline prosonic flow 90 Operating Instructions Manual page 51

PROline Prosonic Flow 90
Command No.
HART command / Access type
44 Write unit of primary process
variable
Access = write
48 Read additional device sta-
tus
Access = read
50 Read assignment of the
device variables to the four
process variables
Access = read
Endress+Hauser
Command data
(numeric data in decimal form)
Set unit of primary process variable Only unit
which are suitable for the process variable are
transferred to the device:
Byte 0: HART unit code
Factory setting:
Primary process variable = Volume flow
!
Note!
• If the written HART unit code is not the cor-
rect one for the process variable, the device
will continue with the last valid unit.
• If you change the unit of the primary process
variable, this has no impact on the system
units.
none
none
Response data
(numeric data in decimal form)
The current unit code of the primary process
variable is displayed as a response:
Byte 0: HART unit code
!
Note!
Manufacturer-specific units are represented
using the HART unit code "240".
The device status is displayed in extended form
as the response:
Coding: see table on Page 53
Display of the current variable assignment of
the process variables:
– Byte 0: Device variable code for the primary
process variable
– Byte 1: Device variable code for the second
process variable
– Byte 2: Device variable code for the third
process variable
– Byte 3: Device variable code for the fourth
process variable
Factory setting:
• Primary process variable: code 30 for volume
flow
• Secondary process variable: code 250 for
totalizer
• Third process variable: code 40 for sound
velocity
• Fourth process variable: code 49 for flow
velocity
!
Note!
You can set or change the assignment of
device variables to process variables using
Command 51.
5 Operation
51