GSM SIM 900A USB shield is a handy solution for your GSM/GPRS interface needs. You may connect it to a Laptop/Desktop computer with USB or RS232 connection. Also there is a TTL breakout for directly connecting it to microcontrollers like AVR, Arduino, PIC, ARM  and other microcontrollers.

Specifications: GSM SIM900A USB SHIELD

• GSM/GPRS Module: SIMCOM SIM900A
• On board Interfaces
  • USB (usb to serial using CP2102)
  • RS232 with MAX232
  • TTL pin breakout (RXD,TXD,GND)

SIM 900A GSM GPRS Module feature

General features 
•Dual-Band 900/ 1800 MHz
•GPRS multi-slot class 10/8
•GPRS mobile station class B
•Compliant to GSM phase 2/2+
– Class 4 (2 W @900 MHz)
– Class 1 (1 W @ 1800MHz)
•SAIC (Single Antenna Interference Cancellation) support 
•Dimensions: 24* 24 * 3 mm
•Weight: 3.4g
•Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
•SIM application toolkit
•Supply voltage range : 3.2 ... 4.8V
•Low power consumption: 1.0mA(sleep mode&BS -PA-MFRMS=9 )
•Operation temperature: -40°C to +85 °C

Default Settings on the board

• The baud rate is set to 9600 when we ship the board. You may change it with AT+IPR = 115200.
• The echo of characters is turned on by default.

Downloads

SIM 900 AT commands

SIM900_AT_Command_Manual_V1.03.pdf

USB Driver

• To connect GSM Modem with computer USB driver is required, please download from Silicon Labs website.

GUI for windows

• Xplore GSM is a Windows GUI and command line software that can be used to test and evaluate the GSM USB Shield. 

For support visit the products learning page.