The first parameter fildes is the open file descriptor returned from the function open , referring to a specific device.

第一个参数fildes是函数open返回的文件描述符，用于指称具体设备。

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The parameter arg is left to deliver detailed command information needed by the specific device to do its required work.

参数 arg 为具体设备的运转提供详细的命令信息。

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The specific realization of each function module of the circuit was introduced with detailed analysis of the device type selection and its parameter determination.

介绍了采集电路的各个功能模块具体实现方案，对各器件的选型和参数确定做出详细的分析。

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