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RS485/RS232

This section introduces how to use the RS485/RS232 interface functions on the Raspberry Pi, laying the foundation for subsequent project development.

Enable Interface Configuration​

  • Enable the RS485/RS232 interface (disabled by default)

  • Edit the config.txt file

    sudo nano /boot/firmware/config.txt

  • To use RS485/RS232, add the following lines (these correspond to the 4 communication interfaces):

    # Corresponding to CH0
    dtoverlay=uart2-pi5      
    # Corresponding to CH1                
    dtoverlay=uart3-pi5     
    # Corresponding to CH2              
    dtoverlay=uart4-pi5     
    # Corresponding to CH3            
    dtoverlay=uart0-pi5

  • Enable all 4 RS485/RS232 channels simultaneously

    # Enable CH0 ~ CH3 simultaneously, a total of 4 RS485/RS232 channels on the board
    dtoverlay=uart2-pi5 
    dtoverlay=uart3-pi5  
    dtoverlay=uart4-pi5 
    dtoverlay=uart0-pi5

  • After modification, reboot the Raspberry Pi to enable normal program-driven operation of RS485/RS232

    sudo reboot