MBAXP Modbus ActiveX Control MBAXP is a powerful and simple to use Modbus ActiveX control that allows Visual Basic, Excel and other OLE Container applications to quickly and easily access data from a Modbus slave device connected to the PC. MBAXP supports both RTU, ASCII modes and TCP/IP connections. The communication in each instance of MBAXP runs in its own thread. That means: Your program does not stop responding while waiting for Modbus transactions to finish. You can communicate with multiple ports simultaneously. See the Quick Start Guide. MBAXP Technical Facts and Features: RTU Mode. ASCII Mode. Modbus TCP/IP. Multi-threaded for high data throughput. Sample applications included. No runtime fees. Easy control of RS-485 converters with RTS toggle. Data types supported: Integer, Long, Float and Double. Handles multiple ports. One instance per port. Event driven. You get an event whenever a transaction has finished. Broadcast (slave ID 0). Enron Modbus SUPPORTED MODBUS FUNCTIONS: 01: Read coil status 02: Read input status 03: Read holding register 04: Read input registers 05: Force single coil 06: Preset single register 15: Force multiple coils 16: Preset multiple registers 23: Read/Write registers

LABVIEW demo程序，modbus 与汇川PLC通讯

Modbus C# 源代码，值得参考和使用。很多地方值得借鉴。

modbus for STM32

modbus poll 6.3.1+注册码是款功能非常强大的modbus开发调试工具；它可以帮助用户快速的进行modbus调试，也支持进行主机的模拟，让您的开发、调试变得简单，快捷；软件的用户界面相当的友好，可快速的提升调试的效率，唯一不足就是软件是英文的操作界面，对于英语不好的培育比较的吃力，内置了32位和64位的操作系统下载应用，请这进行安装的时候，自行进行选择

modbus poll工具+Modbus Poll Key.txt

简介 一个通讯测试工具，QSAK（Qt Swiss Army Knife）是一款基于Qt开源框架打造的多功能、跨平台调试工具。目前支持串口调试、udp 调试、tcp 调试及 websocket 调试等。支持 Windows、Linux、raspberry pi 等平台。 免费、开源、绿色、免安装 特性 数据转发模块添加数据持久化功能（未实现，将来重新设计转发模块） tcp客户端添加自动重连配置功能 将软件风格模块整合至主窗口中 移除样式模块（真实鸡肋，以后添加调试版来调整软件配色） 数据转发模块tab页面索引添加记忆功能 Windows，Linux平台默认使用fusion软件风格 完善消息输出功能，可查看历史输出消息 发送数据为空时弹窗提示 添加原始数据输出选项，方便查看嵌入式设备启动信息 modbus页面tab选项卡添加持久化记录功能

S7-200SMART 实现MODBUS TCP通信的具体方法示例（客户端读写+服务器响应）

verilog计算modbus帧报文是否正确，3天调试后，测试已经通过

NModbus is a C# implementation of the Modbus protocol. Provides connectivity to Modbus slave compatible devices and applications. Supports serial ASCII, serial RTU, TCP, and UDP protocols. NModbus4 it's a fork of NModbus(https://code.google.com/p/nmodbus). NModbus4 differs from original NModbus in following: 1.removed USB support(FtdAdapter.dll) 2.removed log4net dependency 3.removed Unme.Common.dll dependency 4.assembly renamed to NModbus4.dll 5.target framework changed to .NET 4