| 摘要 |
An electronic control unit (ECU) and a tester are connected to exchange a CAN message through full duplex communication. A CAN communication control unit included in the ECU executes processings such as CAN message reception, response data generation, and CAN message transmission. A buffer management unit included in the ECU is equipped with a plurality of buffers that has uninterrupted ring address structure. The buffer stores reception and transmission data in common with a state sign. The state sign is attached by the CAN communication control unit to indicate a state currently executed in the buffer. The CAN communication control unit selects to use one of the buffers based on the state sign of the buffer when the reception of the request data or the transmission of the response data is executed.
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