Modbus stack for Microchip PIC

Question

Can someone suggest an open source implementation of a Modbus RTU Slave for a Microchip PIC18 processor? I\'m looking for an implementation of Modbus RTU for RS-232/RS-485,

Answer 1

You can find a Modbus RTU and TCP slave implementation in 'C' source code form at http://www.colwaysolutions.com. Since the implementation is in ANSI 'C' you can port it easily to PIC too. The vendor also provides ports to a few popular micro controller cores like 8051, ARM, Coldfire etc. including for some RTOS kernels (OS9, MQX, uc-OS). The library is very light weight consuming negligible RAM and ROM space.