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Data transmission system having a communication control computer for controlling communication between a communication interface module and terminal devices

Image Number 15 for United States Patent #5896418.

In a data transmission system having a data processing unit (MPU) and a communication control unit (CIM) and capable of transmitting a data to a local control unit (LCU) in a half duplex mode, the data processing unit receives the data by an interruption based on an end of data reception signal supplied from the communication control unit.

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