@classmethod<EOL><INDENT>def process_point_value(cls, command_type, command, index, op_type):<DEDENT>
_log.debug('<STR_LIT>'.format(index, command))<EOL>
A PointValue was received from the Master. Process its payload.

:param command_type: (string) Either 'Select' or 'Operate'.
:param command: A ControlRelayOutputBlock or else a wrapped data value (AnalogOutputInt16, etc.).
:param index: (integer) DNP3 index of the payload's data definition.
:param op_type: An OperateType, or None if command_type == 'Select'.