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A groovy modbus library ======================= [](https://travis-ci.org/stephane/libmodbus) 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 Schneider at [www.schneiderautomation.com](http://www.schneiderautomation.com). The license of libmodbus is *LGPL v2.1 or later*. The documentation is available as manual pages (`man libmodbus` to read general description and list of available functions) or Web pages [www.libmodbus.org/documentation/](http://libmodbus.org/documentation/). The documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0 (Unported) (<http://creativecommons.org/licenses/by-sa/3.0/>). The official website is [www.libmodbus.org](http://www.libmodbus.org). The library is written in C and designed to run on Linux, Mac OS X, FreeBSD and QNX and Windows. 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 need to install <https://github.com/chemeris/msinttypes> to fill the absence of stdint.h. 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`. Documentation ------------- The documentation is available [online](http://libmodbus.org/documentation) or as manual pages after installation. The documentation is based on [AsciiDoc](http://www.methods.co.nz/asciidoc/). Only man pages are built by default with `make` command, you can run `make htmldoc` in *doc* directory to generate HTML files. 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.