一个用vb编写的通过GPRS模块可以收发手机短信，使用AT指令。-Written in vb by using a GPRS module can send and receive SMS using AT commands.

用VB编写上位机，实现控制GPRS模块发送短信的简单程序。GPRS模块与上位机用usb-TTL连接，上位机主要实现打开串口和发送短信两个功能。-VB prepared by the host computer, to achieve control GPRS module to send simple text messages. GPRS modules and PC with usb-TTL connection, PC open the serial port and the main a