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FreeMODBUS is a free implementation of the popular Modbus protocol specially targeted for embedded systems. Modbus is a popular network protocol in the industrial manufacturing environment. A Modbus communication stack requires two layers. The Modbus Application Protocol which defines the data model and functions and a Network layer. In its current version FreeMODBUS provides an implementation of the Modbus Application Protocol v1.1a and supports RTU/ASCII transmission modes defined in the Modbus over serial line specification 1.0. Since version 0.7 FreeModbus also supports Modbus TCP defined in Modbus Messaging on TCP/IP Implementation Guide v1.0a. It is licensed under the BSD[1] which permits its usage in commercial environments. The following Modbus functions are currently supported:
Read Input Register (0x04)
Read Holding Registers (0x03)
Write Single Register (0x06)
Write Multiple Registers (0x10)
Read/Write Multiple Registers (0x17)
Read Coils (0x01)
Write Single Coil (0x05)
Write Multiple Coils (0x0F)
Read Discrete Inputs (0x02)
Report Slave ID (0x11)
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