Pc application


I hope someone can help me. I am writing an application in C++ builder to connect to the serial port and send commands to my wavecom module. It works perfectly, but when I attach the USB cable to the PC, the PC application can’t connect to the port, even though all the other serial applications such as putty can connect. Any any help would be greatly appreciated!

Just check the response for AT+WMFM? command from the serial port.Make sure the USB port is opened.If the USB port is not opened issue AT+WMFM=0,1,3.