Modbus Communication for Intel 8051

This project implements Modbus communication for the Intel 8051 microcontroller using the C programming language. It was developed in the Keil 5 development environment, targeting the AT89C51RC2 processor. The project focused on slave functionalities, with Modbus Pool used for simulating the master program and generating the Longitudinal Redundancy Check (LRC).

Features

• Modbus Slave Implementation: Communicates with Modbus masters, responds to function codes (such as read coils, read holding registers, etc.).
• LRC (Longitudinal Redundancy Check): Implemented to ensure data integrity during communication.
• Keil 5 IDE: Developed and tested using Keil 5 with the AT89C51RC2 processor.

Requirements

• Keil 5 IDE: For building and compiling the project.
• AT89C51RC2 Processor: Microcontroller used for the implementation.
• Modbus Pool: Software used to simulate the Modbus master and generate LRC.

Getting Started

1. Clone this repository to your local machine:

   git clone https://github.com/Grkila/MODBUS-for-8051.git

2. Open the project in Keil 5:

   • Launch Keil uVision 5 and open the project file (.uvproj).

3. Build the project:

   • Compile the project by selecting "Build" from the menu in Keil.

4. Upload to the AT89C51RC2:

   • Flash the compiled code to the AT89C51RC2 microcontroller using a suitable programmer.

5. Simulate the master using Modbus Pool:

   • Configure Modbus Pool to communicate with the slave device.

Modbus Slave

• The slave listens for Modbus requests and responds with the appropriate data.
• The slave supports various function codes like:
  • Read Coils
  • Read Holding Registers
  • On timer for outputs
  • error codes
  • LRC

Modbus Master

• The master (simulated via Modbus Pool) sends requests to the slave for reading and writing registers or coils.

Acknowledgements

• Thanks to Modbus Pool for providing the software to simulate the master.
• The AT89C51RC2 processor documentation was invaluable for understanding the hardware features.