@property<EOL><INDENT>def request_pdu(self):<DEDENT>
if None in [self.address, self.value]:<EOL><INDENT>raise Exception<EOL><DEDENT>return struct.pack('<STR_LIT>' + conf.TYPE_CHAR, self.function_code,<EOL>self.address, self.value)<EOL>
Build request PDU to write single register.

        :return: Byte array of 5 bytes with PDU.