libmodbus

A Modbus library for Linux, Mac OS X, FreeBSD, QNX and Win32

Two versions of libmodbus are currently maintained:

Stable release is libmodbus-3.0.6.tar.gz (2013-10-06)
Development release is libmodbus-3.1.4.tar.gz (2016-05-28). This development release is very stable!

Download the tarball of the version you want and run ./configure; make; make install; to compile and install libmodbus on your system.

The latest stable release is also available in many Linux distributions:

You can also browse the source code on stephane/libmodbus or clone with the command:

$ git clone git://github.com/stephane/libmodbus

to compile and test the latest version.