What is it all about?
libmodbus is a free software library to send/receive data according to the Modbus protocol. This library is written in C and supports RTU (serial) and TCP (Ethernet) communications.
* 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. * The license of libmodbus is LGPL v2.1 or later. * The library is written in C and designed to run on Linux, Mac OS X, FreeBSD and QNX and Windows.