介绍用MCS-51系列单片机控制手机收发短信息的原理、硬件电路、PDU数据格式和符合GSM07.05协议要求的短信息发送/接收程序，同时给出了一个应用实例-Introduced the use of MCS-51 Microcontroller phones send and receive short messages principle, the hardware circuit, PDU data format and meet the requirements of the short message GSM07.05 protocol to send/receive process, an application example is given