E+E Elektronik EE772, User Manual

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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 sensor 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
Nx2x0.8mm 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
sensor:
Header
68 Start of telegram
4F 4F L-field (length)
68 Second starting signal
08 C-field (RSP_UD)
XX A-field (Adresse)
Start User data
72 CI-field (variable data structure)
XX XX XX XX Identification 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 flowmesse 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 flow
05 DIF (32 Bit Real)
53 VIF (Mass flow 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 specific 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 flow
04 DIF (32 Bit Integer)
3B VIF (Volume flow 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 flow
04 DIF (32 Bit Integer)
51 VIF (Mass flow 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 specific 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