GSM GPRS SIM900A MODEM REV1.0 Overview GSM GPRS SIM 900A module with Stub Antenna and SMA connector-USB GSM/GPRS Modem-RS232 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).
GSM GPRS SIM900A MODEM REV1.0 Features Dual-Band GSM/GPRS 900/ 1800 MHz. RS232 interface for direct communication with computer or MCU kit. Configurable baud rate. Power controlled using 29302WU IC. ESD Compliance. Enable with MIC and SPeaker socket. ...
GSM GPRS SIM900A MODEM REV1.0 Basic AT Commands for Testing GSM AT Commands: TO CHECK THE MODEM: ↲ TO CHANGE SMS SENDING MODE: AT+CMGF=1 ↲ TO SEND NEW SMS: AT+CMGS=”MOBILE NO.” ↲ <MESSAGE {CTRL+Z} TO RECEIVE SMS AT+CMGD=1 ↲...
GSM GPRS SIM900A MODEM REV1.0 MODULE SETUP step 1 : Insert SIMcard into the SIM slot. step 2 : Plug in 12V -2A DC power adapter, power led is lit (place jumper between PWRkey and on pin for only to turn ON automatically). www.researchdesignlab.com Page 9...
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GSM GPRS SIM900A MODEM REV1.0 step 3 : Press and hold power button (To turn on manually without jumper) step 5 : jumper setting for selecting mini USB or RS232 step 4 : Connect to PC through RS232 cable or miniUSB to USB cable www.researchdesignlab.com Page 10...
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GSM GPRS SIM900A MODEM REV1.0 step 5 : open GSM/GPRS utility software ,choose appropriate COM port and use AT commands listed in this manual for basic testing GPRS GSM/messaging and voice calling. www.researchdesignlab.com Page 11...
GSM GPRS SIM900A MODEM REV1.0 POWER MODES Power down mode SIM900A is set power down mode by “AT+CPOWD=0” There are two methods for the module to enter into low current consumption status Minimum Functionality Mode Minimum functionality mode reduces the functionality of the module to a minimum and thus minimizes the current consumption to the lowest level.
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