M-Bus Communication Protocol - Gossen-Metrawatt

2.2.2.1 Data Information Block (DIB)
The Data Information Block (DIB) contains as a minimum one Data Information Field (DIF). This byte can be extended by a further
10 Data Information Field Extension Bytes (DIFE).
The coding of DIF for this protocol is:
English
Bit Name Description
7 Extension Bit
Specifies if a DIFE Byte follows:
0 = No
1 = Yes
6 LSB of Storage Number Always at 0, i.e. not used
5 - 4 Functions Field
3 - 0 Data Field
Table 2.8 – Data Information Field Structure
Specifies the kind of the value, always at:
00 = Instantaneous Value
Length and Coding of Data:
0001: 8 Bit Integer
0010: 16 Bit Integer
0011: 24 Bit Integer
0100: 32 Bit Integer
0110: 48 Bit Integer
0111: 64 Bit Integer
1100: 8 digit BCD
1101: Variable Length
The coding of DIFE for this protocol is:
Bit Name Description
7 Extension Bit
6 Unit
5 - 4 Tariff
3 - 0 Storage Number Always at 0000
Table 2.9 – Data Information Field Extension Structure
Specifies if a DIFE Byte follows:
0 = No
1 = Yes
Specifies the kind of Energy or Power when Bit 7 is set to 1:
0 = Reactive
1 = Apparent
Specifies which tariff the values are related:
00 = Total Value
01 = Tariff 1
02 = Tariff 2
If Bit 7 is set to 0, the following Data Byte are related to Active Energy or Power. So, if the first DIFE is followed by another DIFE (i.e.
Bit 7 is set to 1), the following Data Byte are related to Reactive or Apparent Energy or Power, depending on Bit 6 value.
2.2.2.2 Value Information Block (VIB)
The Value Information Block (VIB) contains as a minimum one Value Information Field (VIF). This byte can be extended by a further
10 Value Information Field Extension Bytes (DIFE).
The coding of VIF is:
Bit Name Description
7 Extension Bit
6 - 0 Value Information
Table 2.10 – Value Information Field Structure
Specifies if a VIFE Byte follows:
0 = No
1 = Yes
Contains Information on the single Value, such as Unit,
Multiplicator, etc…
12 M-Bus communication protocol