| 摘要 |
PURPOSE:To simplify data and hardware in constitution by adding data to be sent to a master station following transmitted data when there is no local address in a start-stop synchronization system. CONSTITUTION:When data sent from a master station to a subordinate station have no local address, decoder 17 detects a last signal without detecting a local address code. In this case, since FF28 is not reset, AND gate 29 stays open and the last signal is applied to transmitted data selecting circuit 22 via OR gate 27 and also to timer 18. Consequently, circuit 22 fetches data to be sent from the subordinate station to the master station via buffer 20 and sends them to character constituting circuit 23. Once a certain time needed for this fetch passes, a signal is sent from timer circuit 18 to circuit 22, and consequently, the last signal is sent from last signal generating circuit 21 to circuit 23. |
