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SimCom RS-232 Quick Start Manual
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SimCom RS-232 Quick Start Manual

Sim900a gsm/gprs modem
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SIM900A GSM/GPRS Modem
(RS-232)

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Summary of Contents for SimCom RS-232

  • Page 1 SIM900A GSM/GPRS Modem (RS-232)
  • Page 2 Description: This modem is built with SIMCOM SIM900A a Dual-band GSM/GPRS engine. The Modem is designed with RS232 level converter circuitry, which allow user to directly interface with serial port of computer. Default modem is in Auto baud rate mode, can be configure it from 9600-115200 using AT commands.
  • Page 3 Features: Supply Voltage: 5-12V DC. Temperature range : -30 DegC to +80 DegC. LED indication for power and network status. On board switching type power supply regulator with Buzzer to indicate Call Alerts. Transmitting power: - Class4 (2W). - Class1 (1W). GPRS Connectivity: - GPRS multi-slot class10 (default) - GPRS multi-slot class8 (option)

  • Page 4: Connection Details

    Connection Details...
  • Page 5 Connection Details Sr. No. Connection / Terminal Details Note 1 DC Jack (X8) DC Input 7-15 VDC Input 2 DB9 Female Conn (X4) RS232 Connector 3 RJ11-4 Conn (X3) Audio Connector 4 TX (X1-1) Transmit Pin of SIM900 5 RX (X1-2) Receive Pin of SIM900 6 ADC (X2-1) ADC Input Pin...
  • Page 6 Examples: On HyperTerminal connect modem with setting as below : baudrate:9600, parity: None, data bits: 8, stop bits:1 All commands should be executed by pressing “Enter’ button. To check Communication of modem command: AT Reply: OK Make Call: command: ATD975648XXXX; Reply: OK Answer Call: command: ATA...
  • Page 7 Send SMS : 1) Set SMS configuration(Text mode only once): command: AT+CMGF=1 Reply: OK 2) Send SMS : command: AT+CMGS=“+91 975648XXXX” >This is a test SMS<Ctrl+z> Reply: +CMGS:45 Read SMS (location no: 1): command: AT+CMGR=1 Reply: +CGMR: “REC UNREAD”,” 91 975648XXXX” ,””,”02/03/15,20:30:31+00”...
  • Page 8 Reply: +CGML: 1,“REC READ”,” 91 975648XXXX” ,””,”02/03/15,20:30:31+00” This is test SMS +CGMR: 2,“REC UNREAD”,” 91 975648XXXX” ,””,”02/03/15,20:30:31+00” Hello how are you test SMS Note: For more details go to “www.google.com” and search for “SIMCOM SIM900A AT Command”. For SIM900A Datasheet “www.simcom.us/act_admin/supportfile/SIM900_ATC_V1.00.pdf”...