RaspberryPI RS485 Controller

8CH 12V Modbus RTU RS485 Relay

I just wanted to share my simple RS485 controller. This repo contains the following parts:

Folder	Description
BoardCommunication	A python script the creates a simple REST-based interface with json responses
RaspiGPIO	A python script that integrates commands via GPIO-Pins (relays on BoardCommunication script)
Webfrontend	A very simple webfrontend (relays on BoardCommunication script)

usage

Prerequisite: Python3.x installed

# create virtual env
python3 -m venv venv

# activate
source venv/bin/activate

# run server
cd BoardCommunication
python restApi.py

Server listens now on

0.0.0.0:8080

Installation as a service

Prerequisite: Python3.x installed

On systems with systemd installed the instal.shscript can be used to install the communication server as a service.

chmod +x install.sh
./install.sh
# start on boot
sudo systemctl enable rs485
# control
service rs485 start|stop|status

Example request to switch on channel 2

127.0.0.1:8080/on/2/{password}

Returns:

{'channel':2, 'result':'ok','msg':1} #success
{'channel':2, 'result':'fail','msg':'error_message'} #failure

For specific the configurations please refer the comments in the scripts

Used Hardware

• 8CH 12V Modbus RTU RS485 Relay (ebay-Link)
• RaspberryPI Model 3 with debian
• USB - RS485 Konverter (ebay-Link)

Warning

These scripts are not secure! I highly recommend to use them only controlled environments. This is especially true for the web-interface.

License

MIT