文档介绍：I 基于 GSM/GPRS 通信模块的无线通信系统设计【摘要】21世纪是信息化的社会, 在科技高速发展的影响下, 人们也对生活质量提出了新的要求。人们希望在这个信息化的时代下,不受距离和环境的限制实时的掌握重要的信息。本设计目的是设计一个基于 GSM/GPRS 模块 GTM900C 的小系统, 设计主要要求实现使用单片机发送相应的控制指令实现对 GTM900C 的控制,当出现警报的时候自主向用户端发送报警信息,正常模式下,用户发送查询信息, GTM900C 接收并解码信息,这些信息到达单片机后被识别,可以控制单片机。本设计实现了简易的智能采集系统温湿度并实现返回控制监控系统。【关键字】 GSM , AT 指令, STC90C516RD+ ,监控系统【 Abstract 】 The 21st century , as known tous all, has been informational , under the impact of the quickly evolution of technology, it is also the new requirements were asked by people about the quality of life . grasp ing of the important information in real time without the restriction of the distance and the surrounding is people ’s wish , in this a geof information technology. The purpose of this design is that designing a munication system base on the GSM / GPRS module. The main requirements of the design is use MCU STC90C516RD+ to transmit mands to control the GSM / GPRS module, to sent independent alarm information is to the client when there is the alarm, in normal mode, the user sends the query information, GSM / GPRS module to receive and decode the information, these information reach mi nute controller after decoded , the mi nute controller can control the action. The Design is the Implementation of a simple remote temperature and humidity monitoring system. 【 Keywords 】 GSM , mands , STC90C516RD+ , Monitoring system II 目录第一章绪论........................................................................................................................... 1 课题背景.................................................................................................................... 1 基于 GSM 无线通信系统的发展现状及应用前景....................................... 2 本课题研究的目的和意义............................................................................. 2 本文的研究工作和内容安排.................................................................................... 4 第二章系统总体结构及硬件设计..............................................................................