Computers for industrial control and automation systems



Pigeon has one RS-485 port. RS-485 port is available under Linux as '/dev/ttyRS485' (udev rule with such device name has been added in the Raspbian image since 7 November 2016).
In earlier versions, you can use the '/dev/ttyUSB0'. In this case, when you use another USB/UART device there is no guarantee that the RS-485 will be '/dev/ttyUSB0'.

Useful commands

  • Check the RS-485 port settings

    stty -a -F /dev/ttyRS485
  • Send data to the RS-485 port

    echo "test" > /dev/ttyRS485
  • Read data from the RS-485 port
    cat /dev/ttyRS485
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