A gprs device , which resembles a modem with an extended at command set , must define a context using an at command before it enters data mode Gprs设备类似于拥有扩展at命令集的调制解调器,在进入数据模式之前必须使用at命令定义一个上下文。
The siemens mobile telephone with the gsm modem is controlled by the at command through the mobile telephone data line between the signal chip system and the serial interface of the mobile telephone 通过手机数据线连接单片机系统和手机串口,对西门子手机内置的modem进行指令控制。
By analyzing sm frame format , serial communication and at commands concerned about sm , this design implements receiving and sending of sm on pda through connected mobile phone 同时详细介绍了sm模块中的短消息组帧格式、串口通讯以及关于收发短消息的at指令等内容,实现了在pda上通过与之相连的手机收发sm 。
Chapter 4 introduces emphatically at command of gsm module , the communication protocols of the system and debug measure , furthermore the procedure is programmed to simulate supervise center 第四章着重探讨了gsm模块的at命令,系统的通信协议,车载台的软件实现和调试方法,并创造性地编写了一个监控中心模拟程序供调试使用。
After , the technology of serial port communication and socket communication are studied deeply , and analyzing the feature of gsm modem and at command for gsm modem , based on this , software design concerning communication - interface module is accomplished 本文进一步研究了串口与socket通信机制,在详细分析了gsmmodem的at命令集后,完成了通信模块的软件开发。