PURPOSE:To secure a high transfer rate even when the working efficiency of a bus is increased by constructing a full-duplex serial data transfer bus by connecting a pair of lines so as to be used by two modules. CONSTITUTION:The modules A-E are connected to a VXI bus, and pairs of lines TTLTRG01-7 use only two modules out of the modules A-E. Consequently, a dedicated duplex serial data transfer bus capable of performing the transmis sion and reception of data simultaneously can be constructed between the two modules out of the modules A-E connected to the pair of lines 1-7. Data transfer between each module can be performed simultaneously, and a high data transfer rate can be secured even when the working efficiency of the bus is increased.
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