用VB编写的用于调制解调通信程序，此程序是上位机端口。-The communication program is written in VB for modem, it is fit for PC.

AT指令一般应用于MT和TE程序间通信，即终端设备与PC应用之间的连接与通信。其对所传输的数据包大小有定义：即对于AT指令的发送，除AT两个字符外，最多可以接收1056个字符的长度（包括最后的空字符）。 -AT commands are commonly used for communication between MT and the TE program, the terminal equipment and the connection between PC applications an

控制Modem 的C程序，通过串口对Modem进行控制进行拨号和数据传输，可以实现两个Modem之间对传数据和发送文件。使用Visual Studio 2012开发。-Modem Communication Program used to control the modem using serial port on PC。 This program is used to dial-up, send meessage and send files between 2 moderms