class receive_exception(Exception):
	"""Base class for exceptions in this module."""
	pass

class no_receive_exception(Exception):
	"""Base class for exceptions in this module."""
	pass

class stop_exception(Exception):
	"""Base class for exceptions in this module."""
	pass
	
class COM_exception(Exception):
	"""Base class for exceptions in this module."""
	pass

class Pause_exception(Exception):
	"""Base class for exceptions in this module."""
	pass
