GSM modem通讯控件，实现gsm modem端口读写功能-GSM modem communications controller, modem port gsm achieving functional literacy

采用cb平台开发，利用spcom组件实现串口和modem模块通讯，通过v.22bis的方式和银联网控器进行通讯，并支持v.80协议,本程序对串口和modem模块通讯有限好参考价值-Cb platform using the development, utilization spcom components and achieve serial modem module communication, and by the way and silver v.22bis interconnection

avr gsm controller code via sim300 gsm module

control by AT commande used ASM language for controller GSM modem