RS-485

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