| 摘要 |
PURPOSE:To facilitate a broadcast communication, by securing a dynamic control to both the registration and its change of the group address in a loop transmission system. CONSTITUTION:The address data An and GAk which are transmitted via a communication path 5 to designate a station and a station broadcast group are fetched to an address fetching part 7 and then set to a memory address register (MAR) 11. If the address group is set as shown in the figure, bit ''1'' is set to the own address of an address storage circuit 12 and the addresses corresponding to the group addresses GA1 and GA2. At the same time, bit ''0'' is set to other addresses. Accordingly the corresponding transmission controller can fetch the broadcast data to a processor 1 of the own station only in case the data of a communication signal are equal to A3, GA1 and GA2 respectively. |
