| 摘要 |
A CSMA type transmission system for transmitting digital data among a data processing unit and a number of units connected to a bus, each of the units including a storage for storing an own inherent address data, a group address data common to a plurality of data collecting units and a data-bit position data designated inherently to the units belonging to the same group; an address comparator for comparing a master address or a slave address in a transmission frame on the bus with the group address data; a bit position comparator for counting a synchronous signal at a data portion in the transmission frame and comparing the synchronous signal with the data-bit position data; and a data transmitter for transmitting data synchronously with the synchronous signal at the own inherent bit position in the transmission frame when the master address or the slave address coincides with the contents of the own group address data. Since it is possible to transmit the transmission data among a number of grouped units with one transmission frame, the data from a number of data collecting units connected to the bus can be transferred to the data processing unit speedily thereby enabling the system to operate at a high speed.
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