MODBUS

Modbus RTU C library for embedded systems.

Requirements

Memory

	Flash	RAM
Master	~2K	64
Slave	~4K	96 *

* Without database size, default +68 Byte.

Guide

Follow below steps:

• Select master or slave mode in mb.h or in Compiler Defines.
• Send Byte-by-Byte received data to mb_rx_new_data() for processing .
• Use mb_set_tx_handler() for set callback for transmit data from MODBUS layer.
• In master mode, received packet don't process automatically! so the callback must be set by mb_set_master_process_handler() .

Note: The library don't handle Rx Timout error! the mb_rx_timeout_handler() must be call for reset rx buffer index .

Examples

• STM32 MODBUS Slave Example
• STM8 MODBUS Slave Example
• AVR MODBUS Network Example

File Description

Common

• mb : Common MODBUS init,functions and types
• mb-link : Prepare Packet for send, receive and process
• mb-crc : Cyclic redundancy check
• mb-packet : Make packets

Slave

• mb-check : Checking received data
• mb-process : Process received packets
• mb-table : Database

Run Test.c

After installing GCC and Make , run below command:

make test