GPRS模块SIM300初始化命令，打电话拨号命令，挂机命令，发短信命令，GPRS连网命令，GPRS网络传输数据命令。包含模块最基本的用法，改变GPRS模块波特率的设置方法，掉电保持不变。-SIM300 GPRS module initialization command, the command dial phone, hang up the command, send SMS commands, GPRS networking commands, GPRS network to transfer data command. Contains the most basic use of the module, GPRS module to change the baud rate setting methods, power-down remains the same.