A GSM modem is a wireless modem that works with a GSM wireless network. A wireless modem behaves like a dial-up modem. The main difference between them is that a dial-up modem sends and receives data through a fixed telephone line while a wireless modem sends and receives data through radio waves.
- Reading, writing and deleting SMS messages.
- Sending SMS messages.
- Monitoring the signal strength.
- Monitoring the charging status and charge level of the battery.
- Reading, writing and searching phone book entries.
Connect your GSM modem to Serial modem of the PC. Open Hyper Terminal window on PC (Start -> All program -> Accessories -> Communications -> Hyper Terminal)
Open the new connection with default settings and get response from GSM modem on terminal. Once confirmation of GSM modem detection type the following basic commands to use your GSM modem.
Basic AT(attention) commands for GSM modem:
- AT (Attention command)
- AT+CREG? (To check signal)
- AT+CMGS=”” (To send sms)
- AT+CMGR= (To read sms)
- AT+CMGD= (To delete sms)
- ATD98414XXXXX; (To make call)
Implement the same concept in microcontrollers to send AT commands to serial via microcontroller. So that you can control your applications / appliances using mobile with the help of Microcontorllers.