For more details on the Modbus protocol, see the Modbus standard link in Resources.

要了解Modbus协议的更多细节，请参见参考资料中的Modbus标准链接。

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A notable problem is raised that the data link can not be controlled; therefore any access following the standard Ethernet data link layer protocol is recognized as legal.

安全交换机所在的内部网存在的一个显著问题就是网络链路协议不可控，使得任何遵守标准协议的网络访问在底层机制上都是合法的。

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