libmodbus windows下使用的两种方式源码，一种是直接加入vs工程，工程代码在资源里，另外一种是编译dll和lib库

# A groovy modbus library  ## Overview libmodbus is a free software library to send/receive data with a device which respects the Modbus protocol. This library can use a serial port or an Ethernet connection. The functions included in the library have been derived from the Modicon Modbus Protocol Reference Guide which can be obtained from [www.modbus.org](http://www.modbus.org). The license of libmodbus is *LGPL v2.1 or later*. The official website is [www.libmodbus.org](http://www.libmodbus.org). The website contains the latest version of the documentation. The library is written in C and designed to run on Linux, Mac OS X, FreeBSD, Embox, QNX and Windows. You can use the library on MCUs with Embox RTOS. ## Installation You will only need to install automake, autoconf, libtool and a C compiler (gcc or clang) to compile the library and asciidoc and xmlto to generate the documentation (optional). To install, just run the usual dance, `./configure && make install`. Run `./autogen.sh` first to generate the `configure` script if required. You can change installation directory with prefix option, eg. `./configure --prefix=/usr/local/`. You have to check that the installation library path is properly set up on your system (*/etc/ld.so.conf.d*) and library cache is up to date (run `ldconfig` as root if required). The library provides a *libmodbus.pc* file to use with `pkg-config` to ease your program compilation and linking. If you want to compile with Microsoft Visual Studio, you should follow the instructions in `./src/win32/README.md`. To compile under Windows, install [MinGW](http://www.mingw.org/) and MSYS then select the common packages (gcc, automake, libtool, etc). The directory *./src/win32/* contains a Visual C project. To compile under OS X with [homebrew](http://mxcl.github.com/homebrew/), you will need to install the following dependencies first: `brew install autoconf automake libtool`. To build under Embox, you have to use its build system. ## Testing Some tests are provided in *tests* directory, you can freely edit the source code to fit your needs (it's Free Software :). See *tests/README* for a description of each program. For a quick test of libmodbus, you can run the following programs in two shells: 1. ./unit-test-server 2. ./unit-test-client By default, all TCP unit tests will be executed (see --help for options). It's also possible to run the unit tests with `make check`. ## To report a bug or to contribute See [CONTRIBUTING](CONTRIBUTING.md) document. ## Documentation You can serve the local documentation with: ```shell pip install mkdocs-material mkdocs serve ```