Then hit the Return or Enter key. From here on, I won't tell you to hit Return or Enter to send the command. Just remember that you have to do it. Once you see a response, check to see if it's in words or numbers. This means we can back up a little and explain how the AT command set works.
Modems have a neat way of ignoring spaces in commands.
They aren't seen at all, nor are they counted. So this makes it easy for you to dress up your commands so they make sense. That can be very handy, especially if you find that the modem arrived from the factory with the wrong settings for your situation. Unless your software is some dimbulb freeware offering, you should be able to turn on the software's capture mode and save the commands the modem shows you on the screen. It calls up the settings made by the factory.