| 摘要 |
PURPOSE:To give the supervisory whether the communication control is performed properly or not by giving an interruption immediately when the carrier detection signal becomes off and at the same time extinguishing the pat signals. CONSTITUTION:Interruption signal L2 is generated from OR circuit 9 when circuit control word memory control circuit 3 detect the non-existence of carrier detection signal CD. And then the L2 interruption is carried out to inspect the contents of circuit control word ICW. At the same time, logic O is delivered from AND circuit 11 when the extinguishment of signal CD is detected, and pad signal PAD is extinguished. Then signal CD (ICW4) is clocked continuously until the end of the program process, thus avoiding the erroneous supervisory. |
