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文章介绍了一种单片机与MODEM（调制解调器）简单的硬件接口及软件控制方法，以无限扩展单片机的通信距离，增强单片机在遥控、遥测、遥讯等诣多方面的实际应用能力。
This article introduces a simple hardware interface and software control method of single chip microcomputer and modem (modem), in order to extend the communication distance of the single chip microcomputer infinitely and enhance the actual application ability of the single chip microcomputer in many aspects such as remote control, telemetering and telemetry.