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MODBUS串行通信协议_英文.pdf

更新时间:2019-12-01 20:44:02 大小:157K 上传用户:xiaoyaoy查看TA发布的资源 标签:modbus协议 下载积分:2分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

资料介绍

    Modbus是一种串行通信协议用于串口、以太网以及其他支持互联网协议等。

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文件名 大小
MODBUS协议_英文.pdf 157K

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MODBUS Application Protocol Specification  
MODBUS.ORG  
1
Introduction .......................................................................... 2  
1.1 Scope of this document.......................................................... 2  
1.2 References............................................................................. 2  
Content  
2
3
4
Abbreviations ....................................................................... 3  
Context................................................................................. 3  
General description .............................................................. 5  
4.1 Protocol description................................................................ 5  
4.2 Data Encoding........................................................................ 7  
4.3 MODBUS data model ............................................................. 7  
4.4 Define MODBUS Transaction ................................................. 9  
5
6
Function Code Categories .................................................. 11  
5.1 Public Function Code Definition.............................................12  
Function codes descripitons................................................ 12  
6.1 01 (0x01) Read Coils.............................................................12  
6.2 02 (0x02) Read Discrete Inputs..............................................14  
6.3 03 (0x03) Read Holding Registers .........................................17  
6.4 04 (0x04) Read Input Registers .............................................18  
6.5 05 (0x05) Write Single Coil....................................................20  
6.6 06 (0x06) Write Single Register .............................................22  
6.7 15 (0x0F) Write Multiple Coils................................................25  
6.8 16 (0x10) Write Multiple registers ..........................................28  
6.9 20 (0x14) Read File Record...................................................29  
6.10  
6.11  
6.12  
22 (0x16) Mask Write Register...........................................34  
23 (0x17) Read/Write Multiple registers..............................35  
43 (0x2B) Read Device Identification..................................38  
7
MODBUS Exception Responses......................................... 43  
modbus.org  
1/45  
8May02  

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