sae j1979-da

SAE J1979-DA是一个用于诊断车辆的标准协议。根据引用\[3\]中的描述，SAE J1979-DA协议中的PID为0x0C，用于请求发动机转速数据。在使用SAE J1979-DA协议时，可以发送一个请求消息，其中包含PID为0x0C，然后等待ECU的响应。根据引用\[3\]中的示例，ECU的响应消息中的数据可以通过特定的解析方法来得到发动机转速的值。在该示例中，解析后的发动机转速为699.5 rpm。
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