(3) 4.33 out of 5 stars Write reviewReport bug
  • Part No :
  • GSM-1964
  • Availability:
  • In Stock
  • Shipping :
  • Same Day*
  • Weight:
  • 0.05Kg
  • Made By:
  • rhydoLABZ
  • Mfr.Part.No:
  • GSM-1964
  • Quality Rank:
  • 100/100
Rs 1299
(Excluding GST.)
Rs 1533
(Including GST)
1533 New In Stock
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Description: The GSM/GPRS Modem-RS232, from rhydoLABZ, is built with Dual Band GSM/GPRS engine- SIM900A, works on frequencies  900/ 1800 MHz. The Modem is coming with RS232 interface,which allows you 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.

Note: rhydoLABZ wiki has extensive contents showing you how to get started, how to configure the GSM/GPRS Modem-RS232 Modem and other details such as pinout, schematic etc. Kindly visit our wiki page for any reference.

Note: Please note that SIM900A is a dual-band module suitable only for Asian countries. For world wide usage please choose GSM/GPRS modems embedded with SIM900 module.

The Modem is manufactured with Automatic Pick and place machine with high quality standard.The onboard Low dropout 3A Power supply allows you to connect wide range unregulated power supply  . Using this modem,you can make audio calls, SMS, Read SMS, attend the incoming calls, access internet etc through simple AT commands.

Modem Features:
  • High Quality Product (Not hobby grade)
  • Dual-Band GSM/GPRS   900/ 1800 MHz
  • RS232 interface for direct communication with computer or MCU kit
  • Configurable baud rate
  • SMA connector with GSM Antenna.
  • SIM Card holder.
  • Built in Network Status LED 
  • Inbuilt Powerful TCP/IP protocol stack for internet data transfer over GPRS.
  • Audio interface Connector
  • Normal operation temperature: -20 °C to +55 °C
  • Input Voltage: 5V-12V DC
SIM900A General Specification:
  • 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)
  • Dimensions: 24x24x3mm
  • 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)
  • Operation temperature: -40°C to +85 °C
Modem Specifications:
  • Fax: Group 3, Class 1
  • Data
    • GPRS class 10: max. 85.6 kbps (downlink)
    • PBCCH support
    • Coding schemes CS 1, 2, 3, 4
    • CSD up to 14.4 kbps
    • USSD
    • Non transparent mode
    • PPP-stack
  • SMS
    • Point to point MO and MT
    • SMS cell broadcast
    • Text and PDU mode
  • Voice
    • Tricodec
      • Half rate (HR)
      • Full rate (FR)
      • Enhanced Full rate (EFR)
    • Hands-free operation (Echo suppression)
    • AMR
      • Half rate (HR)
      • Full rate (FR)
  • Firmware Support
    • FOTA
    • MMS
    • Java (cooperate with Iasolution)
    • Embedded AT
  • Other features
    • 0710 MUX protocol
    • Embedded TCP/UDP protocol
    • FTP/HTTP
  • Interfaces
    • Interface to external SIM 3V/ 1.8V
    • Analog audio interface
    • RTC backup
    • SPI interface (option)
    • Serial interface
    • Antenna pad
    • I2C
    • GPIO
    • PWM
    • ADC
  • Compatibility: AT cellular command interface
  • Certificates
    • CE
    • FCC
    • ROHS
    • PTCRB
    • GCF
    • IC
    • ICASA
    • REACH
Package Includes:
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By Tech Support from N/A on March 19, 2016
It can be used along with Arduino or PIC. To use it along with an Arduino Board you would require a converter, either USB-RS232 or TTL-RS232
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By Valerie Loo from N/A on March 18, 2016
Can i ask whether this GSM is for PIC or for arduino? I have read the discription but there are no comment about this matter.

Hope to hear reply from you soon. :D
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By Narendra Guptha from N/A on January 07, 2016
I was looking for a fine quality sim900 module that works on DC adapter along with a DB9 connector. Finally I have found it.
2 of 2 people found this review helpful
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    • Q
    • Hi can it detact the dtmf tone i means when i call to the mobile to the this gsm model audio jack connected to the which you discribe in photo and other hand i have dtmf decoder when i press one 1 into mobile it detect into dtmf decoder please reply fast

      asked by Jay patel on May 03, 2016
    • A
    • SIM900A hardware supports DTMF decoding, however the DTMF commands are not supported in all firmwares, SIM900 has released separate firmwares for implementing each specific features. Kindly follow our wiki page to update the firmware.

      Once you upload the new DTMF firmware you can enable the DTMF decoding functionality using the command AT+DDET=1 Thus whenever a button is pressed on the other users end on their dial pad during a call. The SIM900 will automatically decode the DTMF tone coming from the other end and report it as +DTMF:1 or +DTMF:2 for number 1 or number 2 respectively.

Ask a question about GSM/GPRS RS232 MODEM-SIM900A (DB9) - rhydoLABZ

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