Suppose
you have connected your GSM/GPRS modem or mobile phone to your PC /
computer and started a terminal program (such as HyperTerminal on
Microsoft Windows). Now you are ready to enter your first command.
The first thing that is usually done is to test the communication
between the PC and GSM/GPRS modem/mobile phone to confirm that
everything is working properly so far. Simply enter "AT" in
the terminal program to perform the test. When the GSM/GPRS modem or
mobile phone receives "AT", it will send back the final
result code "OK" to indicate that it has received your
command successfully, like this:
