The SIM900A GSM Module with a simple to implement RS232, TTL Serial,Use it to send SMS, make and receive calls, and do other GSM operations by simple AT commands through a serial interface from microcontrollers and computers. It uses the highly popular SIM900A module for all its GSM operations. It comes with a standard RS232 interface which can be used to easily interface the modem to microcontrollers and computers. The modem also features a serial TTL interface option. All modem operations(sending and receiving messages, calls, etc) can be carried out by sending AT commands to this virtual serial port though a serial terminal program. Most programming languages allow sending and receiving serial commands to a serial port and can be used to write softwares that can operate the modem without the need to implement any complex interface. This makes the modem a great choice if you plan to use GSM features on a computer.SIM900A. Package Includes : 1 x SIM900A GSM Module
