E+E Elektronik EE771 Series - Bus Output (Optional); M-Bus (Meter-Bus)

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4.2. Bus Output (optional)
4.2.1. M-Bus (Meter-Bus)
The M-Bus (Meter Bus) is a field bus for recording consumption data. Transmission is carried out serially on
a reverse polarity protected two-wire line. The flow meter as M-Bus slave requires a separate supply voltage.
No specific topology (line or star) is prescribed for the cabling. Normal telephone cable of type J-Y(St)Y
Nx2x0.8 mm can be used. A maximum of 250 meters is permitted per segment (primary addressed).
Read-out of the current measurement/consumption data
The following measurement/consumption values are transmitted during a standard query:
• Standard volumetric flow (32 Bit Real)
• Temperature (32 Bit Real)
• Mass flow (32 Bit Real)
• Consumption meter status (32 Bit Real)
• Flow velocity (32 Bit Real)
• Standard volumetric flow (32 Bit Integer)
• Temperature (32 Bit Integer)
• Mass flow (32 Bit Integer)
• Consumption meter status (64 Bit Integer)
• Flow velocity (32 Bit Integer)
The table below shows the package structure of the measurement/consumption data sent by the EE77x trans-
mitter:
Header
68 Start of telegram
4F 4F L-eld(length)
68 Second starting signal
08 C-eld(RSP_UD)
XX A-eld(Adresse)
Start User data
72 CI-eld(variabledatastructure)
XX XX XX XX Identicationnumber
A5 16 Producer (0x16A5 … EUE)
01 Version
09 Medium (9 … compressed air)
XX Access number (continuous)
00 Status
00 00 Signature
Data record 1: Volumenstrom
05 DIF (32 Bit Real)
3E VIF(Volumeowmesseinm³/h)
XX XX XX XX Act. measuring value
Data record 2: Temperature
05 DIF (32 Bit Real)
5B VIF (Temperature in °C)
XX XX XX XX Act. measuring value
Data record 3: Mass ow
05 DIF (32 Bit Real)
53 VIF(Massowinkg/h)
XX XX XX XX Act. measuring value
Data record 4: Consumption meter reading
05 DIF (32 Bit Real)
16 VIF(Volumeinm³)
XX XX XX XX Act. measuring value
Data record 5: Flow rate
05 DIF (32 Bit Real)
7F VIF(manufacturerspecicinm/s)
XX XX XX XX Act. measuring value
Data record 6: Pressure
05 DIF (32 Bit Real)
6B VIF (Pressure in bar)
XX XX XX XX Act. measuring value
Data record 7: Volume ow
04 DIF (32 Bit Integer)
3B VIF(Volumeowin10
-3
m³/h)
XX XX XX XX Act. measuring value
Data record 8: Temperatur
04 DIF (32 Bit Integer)
59 VIF (Temperature in 10
-2
°C)
XX XX XX XX Act. measuring value
Datenrecord 9: Mass ow
04 DIF (32 Bit Integer)
51 VIF(Massowin10
-2
kg/h)
XX XX XX XX Act. measuring value
Datenrecord 10: Consumption meter reading
07 DIF (64 Bit Integer)
13 VIF (Volume in 10
-3
m³)
XX XX XX XX
XX XX XX XX
Akt. consumption data
Datenrecord 11: Flow rate
04 DIF (32 Bit Integer)
7F VIF(manufacturerspecicin10
-2
m/s)
XX XX XX XX Act. measuring value
Data record 12: Pressure
04 DIF (32 Bit Real)
68 VIF (Pressure in 10
-3
bar)
XX XX XX XX Act. measuring value
End of user data
XX Check sum
16 End of telegram