数据传送采用定长格式，及回送和求和双重冗余校验，以确保通信。

The fixed length format, data echoplex, data sum and dual redundancy checking was adopted in data transmission to avoid the communication errors.

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最后，对定长消息的进一步细化就是原生格式消息。

Finally, a refinement of the fixed-length message is the native format message.

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图2显示了一些常见的消息格式——XML、带标记、定长、原生。

Figure 2 illustrates several common message formats — XML, tagged, fixed-length, and native.

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