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系统要求

为了实现IC卡门禁考勤系统中RS-232B的接口转换，需要1台支B的主机，同时还要提供主机上用于与外设通信的驱动，一般由操作系统提供。此外，还需开发在主机上执行的客户端应用程序。在设备端需要提供具B接口的主控制器芯片，以及编写主控制器上执行B通信代码和用于执行外设功能的相关代码。

1、主机要求

主机必须能够通过设备驱动接B数据，并且使这些数据对处理这些请求的应用程序有效。在主机中必须有一个驱动负责处B传输、辨识设备、B设备收发数据；同时，还需要有一个设备驱动-虚拟化串行口，仿效真实的串口。这个驱动必须能够像真实的串口接收和发B数据。

从应用的观点，设备驱动必须能收发数据，可以通过使用一个虚拟化的串口或通过转化B数据实现。微软提供了一个叫BPOS的设备驱动，它允许应用程序访B设备时，好像它们连接到标准串口上一样。

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