modbus协议原代码，我在机房环境监控项目中已应用。-Modbus protocol source code, in my computer room environmental monitoring project has been applied.

Modbus Master Protocol的ActiveX实现，支持使用VC、VB、Delphi、Excel等编程工具开发Modbus应用程序。-Modbus Master Protocol ActiveX technology, support the use of VC, VB, Delphi, Excel and other programming tools to develop Modbus applications.