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.
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/. 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.
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 need to install https://github.com/chemeris/msinttypes to fill the absence of stdint.h.
To compile under Windows, install MinGW 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, 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.
Documentation
The documentation is available online or as manual pages after installation.
The documentation is based on
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:
- ./unit-test-server
- ./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 document.