| 摘要 |
PURPOSE:To prevent data omission and double reception of data by receiving only a frame of multiple address communication for securing a receiving buffer after a specific frame is received unconditionally, and inhibiting the reception of multiple address communication after the reception of multiple address communication. CONSTITUTION:When a frame addressed to all stations is to be transmitted from a data transmitter 4 to respective data transmitters, the processor in the data transmitter 4 transmits a command frame for setting busy flip-flops 123 and transmission inhibition flip-flops 124 in respective data transmitters firstly to all the stations. For example, multiple address communication addresses to all the stations is sent again to the data transmitter 4 of the transmitting station because of the busy buffer stations of other data transmitters after the busy flip- flops 123 are reset. In this case, a frame detecting circuit 101 sends signals to signals 202, 203, and 204, but flip-flops 123 and 130 are off, so a signal is generated at the output of an exclusive EOR circuit 405 and a signal is generated on neither a receivable signal line 303 or 304, so that a frame receiving circuit 102 is not actuated. |
