Setup And Configuration; Digital Interface; M-Bus (Meter-Bus) - E+E Elektronik EE741 User Manual

6 Setup and Configuration

6.1

Digital Interface

6.1.1.

M-Bus (Meter-Bus)

The M-Bus (Meter-Bus) is a field bus for recording consumption data. Transmission runs serially on a reverse
polarity protected two-wire line. The EE741 flow sensor as M-Bus adress requires a separate supply voltage.
There is no prescribed specific topology (line or star) for the wiring. Normal phone cable of type J-Y(St)Y Nx2x0.8
mm can be used. The max. cable length per segment (primary addressed) is 250 m (820 ft).
The table below shows the package structure of the measurement/consumption data sent by the EE741
sensor:
Header
68
4F 4F
68
08
XX
Start User Data
72
XX XX XX XX
A5 16
01
09
XX
00
00 00
Data Record 1: Volume Flow
05
3E
XX XX XX XX
Data Record 2: Temperature
05
5B
XX XX XX XX
Data Record 3: Mass Flow
05
53
XX XX XX XX
Data Record 4: Consumption Meter Reading
05
16
XX XX XX XX
Tab. 5 Package structure of the measurement and consumption data
Start of the telegram
L-field (length)
Second starting signal
C-field (RSP_UD)
A-field (address)
CI-field (variable data structure)
Identification number
Manufacturer (0x16A5 ... EUE)
Version
Medium (9 ... compressed air)
Access number (consecutive)
Status
Signature
DIF (32 bit Real)
3
VIF (Volume flow in m /h)
Act. measuring value
DIF (32 bit Real)
VIF (Temperature in °C)
Act. measuring value
DIF (32 bit Real)
VIF (Mass flow in kg/h)
Act. measuring value
DIF (32 bit Real)
3
VIF (Volume in m )
Act. consumption value
Data Record 5: Flow Velocity
05 DIF (32 bit Real)
VIF
7F
(manufacturer specific in m/s)
XX XX XX XX Act. measuring value
Data Record 6: Volume Flow
04 DIF (32 bit Integer)
VIF
3B
(Volume flow in 10
XX XX XX XX Act. measuring value
Data Record 7: Temperature
04 DIF (32 bit Integer)
59 VIF (Temperature in 10
XX XX XX XX Act. measuring value
Data Record 8: Mass Flow
04 DIF (32 bit Integer)
51 VIF (Mass flow in 10
XX XX XX XX Act. measuring value
Data Record 9: Consumption Meter Reading
07 DIF (64 bit Integer)
13 VIF (Volume flow in 10
XX XX XX XX
Act. consumption value
XX XX XX XX
Data Record 10: Flow Velocity
04 DIF (32 bit Integer)
VIF
7F
(manufacturer specific in 10
XX XX XX XX Act. measuring value
End User Data
XX Checksum
16 End of the telegram
Inline Flow Sensor for Compressed Air and Gases | 19
User Manual EE741
-3 3
m /h)
-2
°C)
-2
kg/h)
-3 3
m )
-2
m/s)