docs: def write(self, text):
          ''' Write text out to the arm. '''
          # Output is converted to bytes with Windows-style line endings.
          if sys.version_info[0] == 2:
              text_bytes = str(text.upper() + '\r\n').encode('utf-8')
          else:
              text_bytes = bytes(text.upper() + '\r\n', 'utf-8')
          self.ser.write(text_bytes)