实例介绍
【实例简介】
【实例截图】
【实例截图】
【核心代码】
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 2 6.4.3 Configuring Data Output.................................................................................... 48 6.5 Generalized Object Layer.............................................................................................. 51 6.6 Application Layer Status............................................................................................... 53 6.7 Special Slave Features .................................................................................................. 55 6.7.1 Auto Speed Detect.............................................................................................. 55 6.7.2 Slave Collision Detect........................................................................................ 56 6.7.3 Use of the Fabrication Number .......................................................................... 57 6.7.4 Hex-Codes $A-$F in BCD-Data Fields............................................................... 57 7 Network Layer.................................................................................................................... 63 7.1 Selection and Secondary Addressing ............................................................................ 63 7.3 FCB-Bit and Selection .................................................................................................. 64 7.4 Searching for Installed Slaves...................................................................................... 65 7.4 Generalized Selection Procedure .................................................................................. 69 8 Appendix ............................................................................................................................. 70 8.1 Alarm Protocol.............................................................................................................. 70 8.2 Coding of Data Records................................................................................................ 71 8.3 Tables for Fixed Data Structure .................................................................................... 74 8.3.1 Measured Medium Fixed Structure .................................................................... 74 8.3.2 Table of Physical Units....................................................................................... 75 8.4 Tables for Variable Data Structure ............................................................................... 76 8.4.1 Measured Medium Variable Structure ............................................................... 76 8.4.2 Data Field Codes ................................................................................................ 77 8.4.3 Codes for Value Information Field (VIF)........................................................... 78 8.4.4 Extension of primary VIF-Codes........................................................................ 80 8.4.5 Codes for Value Information Field Extension (VIFE) ....................................... 84 8.5 References..................................................................................................................... 88
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