| 摘要 |
A data transmission system includes control units connected to a network line and various sensors. Each of the control units includes an ID code comparing/processing section. In each of the ID code comparing/processing sections, multiplex communication control units, FIFO memory, CPU, main register and data extracting circuit are provided. Each of the multiplex communication control units receives an ID code extracted from a data frame transmitted via the network line by the data extracting circuit and checks whether the received ID code coincides with preset ID codes or not. The FIFO memory receives and holds the ID code in response to a coincidence signal from the multiplex communication control units and outputs a signal indicating that the ID code is held. The CPU detects that an ID code attached to main data necessary in the ID code comparing/processing section is input from the network line in response to a signal indicating that the ID code is held, processes main data stored in the main register corresponding to the ID code held in the FIFO memory.
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