Sale GSM Modem(SIM900A) (Serial-RS232) zoom
  • GSM Modem(SIM900A) (Serial-RS232)
  • GSM Modem(SIM900A) (Serial-RS232)
  • GSM Modem(SIM900A) (Serial-RS232)
  • GSM Modem(SIM900A) (Serial-RS232)
Price: Rs 1,500.00 Rs 1,100.00
Price in reward points: 13500
Product Code: GSM Modem (SIM900A)(Serial-RS232)
Reward Points: 135
Availability: In Stock

   This is a plug and play GSM Modem with a simple to implement RS232, TTL serial and USB interface. It works on frequencies 900/ 1800 MHz. 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 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. Through USB, the modem can be operated from a computer to send/receive calls, messages, etc

   The modem consists of all the external circuit required to start experimenting with the SIM900A module like the power regulation, external antenna, SIM Holder, etc.


  • Uses the extremely popular SIM900A GSM module
  • USB communication allows direct communication with computers
  • Provides the industry standard serial RS232 interface for easy connection to computers and other devices
  • Provides serial TTL interface for easy and direct interface to microcontrollers
  • Power, Status and Network LEDs for easy debugging
  • Onboard MIC and Speaker circuits and 3.5mm audio connectors for direct connection to mics and speakers
  • Can be used for GSM based Voice communications, Data/Fax, SMS,GPRS and TCP/IP stack
  • Can be controlled through standard AT commands
  • Module’s operation mode can be controlled through the PWR Key connected to the PWRKEY pin (refer the SIM900A datasheet for more information)
  • Comes with an onboard wire antenna for better reception. Board provides an option for adding an external antenna through an SMA connector
  • The SIM900A allows an adjustable serial baudrate from 1200 to 115200 bps
  • Modem has low power consumption of 0.25 A during normal operations and around 1 A during transmission
  • Operating Voltage: 7 – 15V AC or DC (board has onboard rectifier)

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