本例利用MSCOMM控件，通过串口发送AT指令来操作MODEM,使两台计算机通过公用电话网进行数据传送-This case, use the MSComm control through the serial port to send AT commands to operate MODEM, two computers for data transmission via the public telephone network

基础学习资料-传送指令，西门子综合班教案(Basic learning data - transfer instructions)