GSM/GPRS Sim900a Modem-RS232 is built with Dual Band GSM/GPRS engine- SIM900A, works on frequencies 900/ 1800 MHz. The Modem comes with RS232 interface, which allows you to connect PC as well as microcontroller with RS232 Chip(MAX232). The baud rate is configurable from 9600-115200 through AT command. The GSM/GPRS Modem is having internal TCP/IP stack to enable you to connect with internet via GPRS. It is suitable for SMS, Voice as well as DATA transfer application in M2M interface. Using this modem, you can make audio calls, SMS, Read SMS, attend the incoming calls and internet etc through simple AT commands.
Status of Modem Indicated by LED
Simple to Use & Low Cost
On board switching type power supply regulator
SMA connector with GSM Antenna.
Input Voltage: 5V-12V DC