I'm developing a SMS web application using a GSM phone connecting to my PC. The phone model that i've chosen is Nokia 8250. After i've connected the data cable (Serial port) to my PC, i used the hyper terminal to test the connection. The settings is 9600, N, 8, with a proper port (COM1). When i typed "AT" on the window (hyper terminal window), i get nothing (meaning no response).
Even when i tried to run my application, i can see from my log file that the response getting from the "AT" command will be exactly the same as the input. Eg: if the at command is "AT", i'll get back the "AT" as input stream from the port. What's the problem?