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1 Introduction.......................................................................................................................... 3
2 The Basics of Serial Bus Systems........................................................................................ 4
2.1 Applications and Definitions .......................................................................................... 4
2.2 Basic Functions of Bus Systems ..................................................................................... 5
2.2.1 Access Techniques ............................................................................................... 6
2.2.2 Synchronization of Participants........................................................................... 7
2.2.3 Error Processing ................................................................................................... 7
2.3 The OSI Reference Model .............................................................................................. 8
3 Overview of the M-Bus ...................................................................................................... 11
3.1 Requirements of a Bus System for Consumer Utility Meters....................................... 11
3.2 The M-Bus in the OSI Model........................................................................................ 11
4 Physical Layer .................................................................................................................... 14
4.1 Principles of Operation ................................................................................................. 14
4.2 Specifications for Bus Installations............................................................................... 16
4.3 Specifications of the Repeaters..................................................................................... 17
4.4 Slave Design ................................................................................................................. 17
5 Data Link Layer ................................................................................................................. 21
5.1 Transmission Parameters .............................................................................................. 21
5.2 Telegram Format........................................................................................................... 22
5.3 Meaning of the Fields ................................................................................................... 23
5.4 Communication Process................................................................................................ 25
5.5 FCB- and FCV-Bits and Addressing............................................................................. 27
5.5.1 Applications of the FCB-mechanism .................................................................. 27
5.5.2 Implementation aspects for primary addressing.................................................. 28
6 Application Layer............................................................................................................... 31
6.1 CI-Field ......................................................................................................................... 31
6.2 Fixed Data Structure ..................................................................................................... 34
6.3 Variable Data Structure................................................................................................. 36
6.3.1 Fixed Data Header.............................................................................................. 36
6.3.2 Variable Data Blocks.......................................................................................... 37
6.3.3 Manufacturer Specific Data Block ..................................................................... 43
6.4 Configuring Slaves........................................................................................................ 45
6.4.1 Switching Baudrate............................................................................................. 45
6.4.2 Writing Data to a Slave ...................................................................................... 46
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