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Modbus TCP to Modbus RTU gateway

This is my Modbus TCP to Modbus RTU gateway written in Python. I run it on a BeagleBone Green equiped with a Waveshare CAN RS485 Cape to communicate with my centralized ventilation system.

I've only tested Modbus functions [01,02,03,04,06] so far because I don't need any other functions for my purpose. Maybe the gateway need to be exteded to support other functions.

The gateway receives a ModbusTCP frame, translates it into a ModbusRTU frame, takes the ModbusRTU response and converts that into the ModbusTCP response for the initial request.

How to use:

git clone https://github.com/Bouni/ModBusGateway.git
cd ModBusGateway
python modbus-gateway.py

The configuration can be changed by editing the modbus-gateway.cfg file.

A more detailed description can be found here:

• http://blog.bouni.de/blog/2016/12/02/rs485-on-a-beaglebonegreen-plus-waveshare-cape/
• http://blog.bouni.de/blog/2016/12/10/modbus-tcp-to-modbus-rtu-gatway-on-a-beaglebone-green/