| 摘要 |
<p>PURPOSE:To prevent a useless message from being sent through a data link by stopping the relay of the message when a routing number of times exceeds a prescribed number of times upon the receipt of the message. CONSTITUTION:A reception section 6 of a communication processing unit 2i receives a message 101 via communication lines 3, 4 from other communication processing units 2h, 2j, 2k... and outputs the message 101 to an adder section 7. The adder section 7 adds a value decided in advance in response to a relay class (H9 included i the received message 101 to number of routing numbers (d) of the message 101 and a discrimination section 8 discriminates whether or not the routing number of times (d) after the addition exceeds a prescribed number of times. When it is discriminated that the routing number of times (d) exceeds a prescribed number of times, the relay disable processing of the message 101 is implemented.</p> |
