def METHOD_NAME(scenario_etree):
    """
    There may be 4 types in the console item
    1. BDF:(00:18.2) seri:/dev/ttyS2
    2. /dev/ttyS2
    3. ttyS2
    4. "None"
    """
    ttys_n = ''
    ttys = get_node("//SERIAL_CONSOLE/text()", scenario_etree)
    if not ttys or ttys == None or ttys == 'None':
        return ttys_n
    if ttys and 'BDF' in ttys or '/dev' in ttys:
        ttys_n = ttys.split('/')[2]
    else:
        ttys_n = ttys
    return ttys_n