import ctypes

class CallSign(ctypes.LittleEndianStructure):
    _pack_ = 1
    _fields_ = [
        
        ("character_4", ctypes.c_uint16, 8),
        ("character_3", ctypes.c_uint16, 8),
        ("character_2", ctypes.c_uint16, 8),
        ("character_1", ctypes.c_uint16, 8)
        
    ]