| 摘要 |
PURPOSE:To facilitate the retransmission processing when the connection is cut by transmitting a held message when the connection is set again and requesting successively the telegrams by a user program without confirming the transmission of these telegrams. CONSTITUTION:When the cut of connection is detected, a communication processing system informs 104 the users of a fault of the communication resources. If a transmission request 105 is given from a user program for the next telegram having the contents different from those of the precedent telegram despite the information 104, the communication processing system holds both telegrams. Then a communication resources recovery request 106 is received from a connection control of the user side. Thus the communication processing system sets again the connection by reference to a communication resources control table. Then the next telegram transmission request 107 is received from the user program and the communication processing system holds the requested telegram and also transmits the telegram via the connection set again. Thus the telegram retransmission processing is facilitated.
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