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Communication with M-Bus
2CMC48001M0201
181
A43/A44
Revision: C
User Manual
Command
Read request voltage harmonics
10.2.1 Telegram Format
General
M-Bus uses 3 different telegram formats. The formats are identified by the start
character.
Single Character
Short Frame
Long Frame
E5H
Start (10h)
Start (68h)
C-Field
L-Field
A-Field
L-Field
Check Sum
Start (68h)
Stop (16h)
C-Field
A-Field
CI-Field
User Data (0-252 Bytes)
Check Sum
Stop (16h
The
Single Character
format consists of a single character and is used to ac-
knowledge received telegrams.
The
Short Frame
format is identified by its start character (10h) and consists of
five characters. Besides the C- and A-fields it includes the check sum and the
stop character 16h.
The
Long Frame
format is identified by its start character (68h) and consists of a
variable number of characters. After the start character the L -field is transmitted
twice, then the start character once again followed by the C-, A- and CI-fields.
The user data (0 - 252 bytes) is transmitted after the CI-field followed by
the check sum and the stop character (16h).
10.2.1.1 Field description
General
All fields in the telegram have a length of 1byte (8 bits).
The L-Field
The L-Field (length field) gives the size of the user data (in bytes) plus 3 (for the
C-, A- and CI-Fields). It is transmitted twice in the telegrams using the long frame
format.
Summary of Contents for A43
Page 1: ...A43 A44 User Manual ...
Page 40: ...Meter Settings A43 A44 40 2CMC48001M0201 User Manual Revision C ...
Page 55: ...Technical Description 2CMC48001M0201 55 A43 A44 Revision C User Manual ...
Page 58: ...Technical Description A43 A44 58 2CMC48001M0201 User Manual Revision C ...
Page 61: ...Technical Description 2CMC48001M0201 61 A43 A44 Revision C User Manual ...
Page 75: ...Technical Description 2CMC48001M0201 75 A43 A44 Revision C User Manual ...
Page 84: ...Measurement Methods A43 A44 84 2CMC48001M0201 User Manual Revision C ...
Page 91: ...Measurement Methods 2CMC48001M0201 91 A43 A44 Revision C User Manual ...
Page 95: ...Measurement Methods 2CMC48001M0201 95 A43 A44 Revision C User Manual ...
Page 102: ...Communication with Modbus A43 A44 102 2CMC48001M0201 User Manual Revision C ...
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