Elvaco CMi4140, User Manual

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CMi414
0 User’s Manual English
CMi414
0 User’s Manual English
page | 12 (26) [2020-06]
V1.1
Figure 1: CMi4140 M-Bus message structure
For message format
JSON , the data is presented as ASCII.
Field Size Description
Message
format
identifier 1 byte 0x15 = Standard
0x16 = Compact
0x17 = JSON
0x18 = Scheduled
– Daily redundant
0x19 = Scheduled - Extended
0x1A = Combined heat/cooling
0x1B = Heat Intelligence
Table 5: CMi4140 message formats
6.7.2 Structure and payload
In this section, a detailed description of the structure and payload for each message format is presented.
Standard
Figure 2 illustrates the structure of message format Standard . For a detailed description of the payload,
see Table 6.
Figure 2: Structure, message format Standard
DIB Field Size Data type Description
0 Message
format
identifier 1 byte - 0x15 (Standard)
1 Heat
energy E1
/ Cooling
energy E3 6-7 bytes INT32
Energy consumption (Wh, J, Cal)
0403xxxxxxxx = xxxxxxxx Wh
0404xxxxxxxx = xxxxxxxx * 10 Wh
0405xxxxxxxx = xxxxxxxx * 100 Wh
0406xxxxxxxx = xxxxxxxx kWh
0407xxxxxxxx = xxxxxxxx * 10 kWh
040Exxxxxxxx = xxxxxxxx MJ