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M-Bus应用层技术文档
资料介绍
M-BUS（Meter BUS）总线又称为户用仪表总线，是一种用于非电力户用仪表传输的欧
洲总线标准。 1996 年以前，欧洲因热能（量）水表电子化发展的需要，欧洲着名水表厂商
BRAZIL、 ZENNER、 VIENNA 等与研究机构合作开发一种适用于热能表在线抄读与供电的
仪表总线，以彻底解决电池供电所带来的诸多问题，并推广应用到冷水表、气表等非电力户
用仪表传输中，并写入热能（量）表标准 EN1434:1997。
部分文件列表
| 文件名 | 大小 |
| w4b21021_Dedicated_Application_Layer_(M-Bus).pdf | 256K |
部分页面预览
（完整内容请下载后查看）Prof.Dr.H.Ziegler
Dedicated Application Layer (M-Bus)
Foreword
This document has been prepared by the WG4 of CEN TC 294.This document is a working document.
Scope:
This standard is a backward compatible enhancement to EN1434-3 and is interoperable with EN13757.
1. Introduction
The bus communication system of EN1434-3 is commonly called M-Bus. Its application layer describes
a standard especially for meter readout. It can be used with various physical layers and with link layers
and network layers which support the transmission of variable length binary transparent telegrams.
The first byte of an application layer telegram is the CI-field (Control Information) which distinguishes
between various telegram types and application functions. It is also used to distinguish between true
application layer communication and management commands for lower layers. The meaning of the
remaining bytes of the telegram depends also on the value of the CI-field. This second revision is a
compatible enhancement of the sections 6.4 to 6.6 of the original standard EN1434-part 3:1997.
Besides some clarifications and implementation hints it contains optional enhancements especially for
complex meters. Due to technical progress some variants (Fixed format and mode 2=high byte first)
are no longer supported in this standard.
Note that this standard contains only directions how data should be coded. It is beyond the task of an
application layer standard to define which data must be transmitted under what conditions by which
types of slaves or which data transmitted to a slave must have which reactions. Therefore adherence
to this standard guarantees the coexistence and common communication and readout capability of
slaves via a universal master software (covering all optional features), but not yet functional or
communication interchangeabilty of meters following this standard. For several meter types and meter
classes the company “Fernwärme Wien” and the “AGFW”-group of remote heating users have
provided such application descriptions required for full interchangeability. They are accessible via the
www-server of the m-bus users group (http://www.m-bus.com).
2. CI-Field
2.1 Overview
The original EN1434-3 defined two possible data sequences in multibyte records. This standard supports only the
mode where the least significant byte of a multibyte record is transmitted first.
W4B160201.DOC Application Layer M-Bus Rev.4
16.2.2001
Page 1 of 4849
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