車両診断通信

Explanation of the request message for the WriteDataByIdentifier service.Unlike the ReadDataByIdentifier service, one DID is fixed.Explanation of the response message of the WriteDataByIdentifier service.In practice, NRC$78 may be interleaved.

The WriteDataByIdentifier service has been explained.Usage scenarios.Communication characteristics tied to non-volatile memory.

Confirmed single DID transmitted and received.Confirmed transmitting and receiving multi-DIDs.Confirmed some DIDs are undefined patterns.

Explanation of the request message for the ReadDataByIdentifier service.Multiple DIDs can be set.There may be a limit on the number of DIDs that can be set, and it is an error if the number is exceeded.It is also an error if the response message exceeds 4095 bytes.Explanation of the ReadDataByIdentifier service response messageCombination of DID and dataRecord.In case of multiple DIDs, the above combination is placed in one message.

Explanation of the usage scenario of the ReadDataByIdentifier service.Vehicle status monitoring (verification during development, failure analysis after market release).Forced operation status monitoring during vehicle assembly.Freeze data acquisition at the time of failure detection.

Explanation of the messages of the TesterPresent service.Explanation of suppressPosRspMsgIndicationBit.PositiveResponse suppression.NegativeResponse is returned.PositiveResponse after NRC$78 is also returned.

There is a service called TesterPresent service that does nothing.The TesterPresent service has the following usage scenarios.Checking for communication.Node presence/absence check.Session maintenance.The TesterPresent service is a service that must be supported.

Explain the basic flow of the SecurityAccess service.Explain the actual messages in the basic flow of the SecurityAccess service.Security is applied to resources.Service.DID.

The SecurityAccess service is purposely troublesome procedure, which is the security strength.Must transition to non-defaultSession in advance.Must wait 10 seconds after IGon.If you make a mistake unlocking, you have to IGoff once.

The SecurityAccess service has two major message patterns.requestSeed.Odd sub-functions.sendKey.Even sub-functions.