电表MODBUS智能协议转换器

电表MODBUS智能协议转换器

文档编号:DZXX398 文档字数:14450,页数:52

摘要

MODBUS规约是MODICOM公司开发的一个为很多厂商支持的开放规约。
MODBUS协议是应用于电子控制器上的一种通用语言。通过此协议，控制器相互之间、控制器经由网络（例如以太网）和其它设备之间可以通信。它已经成为一通用工业标准。有了它，不同厂商生产的控制设备可以连成工业网络，进行集中监控。
此协议定义了一个控制器能认识使用的消息结构,而不管它们是经过何种网络进行通信的。它描述了控制器请求访问其它设备的过程，如何回应来自其它设备的请求，以及怎样侦测错误并记录,它制定了消息域格局和内容的公共格式。
MODBUS目前是工业领域全球最流行的协议之一，此协议支持传统的带RS-232、RS-422、RS-485和以太网接口的设备。许多工业设备，包括PLC、DCS、智能仪表等都在使用MODBUS协议作为它们之间的通讯标准。
电表MODBUS智能协议转换器是低成本智能通信接口协议转换器、用于现场仪表及执行器控制。嵌入式PROFIBUS接口OEM2（以下有时称OEM2卡）专为自主开发具有PROFIBUS-DP通信功能产品的用户，以OEM方式提供从站通信接口。

关键词：MODBUS，协议转换器，OEM2，PROFIBUS
ABSTRACT

MODBUS Statute is a development of the company of MODICOM for many manufacturers to support the opening Statute.
MODBUS agreement is applied to the electronic controller of a common language. Through this agreement between controller, the controller through the network (such as Ethernet), and other equipment between the communication. It has become a common industry standard. With it, the different manufacturers can even control equipment for industrial network for centralized monitoring.
The agreement defines a controller can use the information to understand the structure, regardless of what they are after the communications network. It describes the controller request to visit other equipment process, if response from other equipment, and how to detect errors and records. It developed a pattern of information and content domain of public format.
MODBUS industrial area is now the world's most popular one of the agreements. The agreement with the traditional support RS-232, RS-422, RS-485 and Ethernet interface equipment. Many industrial equipment including PLC, DCS, Intelligent Instrumentation in use so as Modbus communication between the standards.
Intelligent meter MODBUS Protocol Converter is a low-cost intelligent communications interface protocol converters. Instrumentation for the scene and actuator control. Embedded PROFIBUS interface OEM2 (hereinafter sometimes referred to OEM2 Card) specifically for self-development with PROFIBUS communication products users, OEM to provide communication interface from the station.

Keyword: MODBUS，PROTOCOL COVERTER，OEM2，PROFIBUS
目录

摘要 I
ABSTRACT II
第1章绪论 1
1.1 设计简介 1
1.2 设计背景 1
第2章 MODBUS智能协议转换器的设计 3
2.1 硬件设计 3
2.1.1 设计工具简介 3
2.1.2 PROFIBUS-DP 从站开发OEM 解决方案 3
2.1.3 硬件原理图及PCB图 5
2.1.4 设计的产品 14
2.2 软件设计 14
2.2.1 通信规约 14
2.2.2 接口板的初始化 15
2.2.3 数据交换 18
第3章调试模式 24
3.1 嵌入式PROFIBUS接口OEM2 24
3.2 OEM2调试实验系统主要用途 24
3.3 调试实验系统调试模式 24
3.4 OEM2调试实验系统主要部件及选件 25
3.5 开发实验板 25
3.6 实验板CPU 26
第4章建立调试实验系统 28
4.1 系统设备清单 28
4.2 系统结构图 29
4.3 安装实验调试系统 29
第5章总结 37
致谢 38
参考文献 39
附录程序 40

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