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介绍一种智能型PC机内置式FAX卡的工作原理和硬件设计。该卡能够通过侦测电话振铃信号来实现自动开机接收传真，完成接收后自动关机，并给出了以RC224ATF为主芯片的FAX卡的一个具体应用实例，
This paper introduces the working principle and hardware design of an intelligent PC built-in FAX card. The card can detect the phone ring signal to automatically start receiving faxes, automatically shut down after the completion of the reception, and gives the RC224ATF based chip FAX card a specific application example,