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MODBUS串行通信协议_英文.pdf
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。。
部分文件列表
| 文件名 | 大小 |
| MODBUS协议_英文.pdf | 157K |
部分页面预览
（完整内容请下载后查看）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
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8May02
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