Meter BUS家用仪表协议的规范

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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

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........................................................................................................... 23

5.3 Meaning of the Fields ................................................................................................... 24

5.4 Communication Process................................................................................................ 26

5.5 FCB- and FCV-Bits and Addressing ............................................................................ 28

5.5.1 Applications of the FCB-mechanism .................................................................. 28

5.5.2 Implementation aspects for primary addressing.................................................. 29

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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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

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

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1 Introduction

This document, which is based on references [11] and [12], gives detailed and actual

information about the M-Bus, which is a low cost home electronic system (HES).

This documentation about the M-Bus is published by the M-Bus Usergroup, which is an

M-Bus Usergroup:

Prof. Dr. Horst Ziegler

Fachbereich Physik

Universität-GH Paderborn

Warburgerstr. 100

Germany 33098 Paderborn

Phone: +49 5251 / 602735

WWW:

http://fb6www.uni-paderborn.de/M-Bus/

The M-Bus (Meter Bus) was developed to fill the need for a system for the networking and

remote reading of utility meters, for example to measure the consumption of gas or water in

the home. This bus fulfills the special requirements of remotely powered or battery driven

systems, including consumer utility meters. When interrogated, the meters deliver the data

they have collected to a common master, which can, for example, be a hand-held computer,

connected at periodic intervals to read all utility meters of a building. An alternative method

of collecting data centrally is to transmit meter readings via a modem.

Other possible applications in home electronic systems for the M-Bus are alarm systems,

♣ Text parts or topics marked with this symbol are new or changed information since

last version 4.7.1 of this document.

4 2 The Basics of Serial Bus Systems

2 The Basics of Serial Bus Systems

2.1 Applications and Definitions

The methods by which data processing systems communicate with each other are classified

according to the distances involved. With world-wide networks the term used is Global Area

Networks (GAN), whereas networks covering continents or large land masses are known as

Wide Area Networks (WAN); Local Area Networks (LAN) are concerned with distances up

to a few kilometers, and are limited to specific geographical areas, such as laboratories, office

buildings and company premises. Such local networks are used, for example, to link

terminals, computers, measuring equipment and process automation modules with one

The equipment can transmit to the central unit either sequentially or simultaneously. One

disadvantage of this arrangement is the increased requirement for cabling.

•

Ring Topology

In this case, the components are connected to one another in a ring, and the data are

transferred from point to point. This topology has the disadvantage that, should a single

equipment fail, the complete network will be out of action.

•

Bus Topology

The components are connected together with a common transmission line, with the result

that at one instant only one equipment can transmit data. This topology is very cost-

effective, it will not be disturbed if one of the components fails, and it allows the

Fig. 1 Network Topologies

2.2 Basic Functions of Bus Systems 5

A serial bus can be defined as a transmission path over which the participants transmit their

data serially (i.e. bit after bit), sequentially in time and using a common medium. In contrast,

in parallel bus systems the individual bits which form a character are transmitted

simultaneously by a certain number of data lines. This results in increased costs for cable and

connectors; the transmission time is shorter than with a serial bus.

2.2 Basic Functions of Bus Systems

The following diagram is intended to provide an overall view of the various forms of serial

bus systems:

with central