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SIM900A GSM/GPRS Modem

(RS-232)

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Summary of Contents for RS-232

Page 1: ...SIM900A GSM GPRS Modem RS 232 ...

Page 2: ...mputer Default modem is in Auto baud rate mode can be configure it from 9600 115200using AT commands Supports Serial port RS232 Audio interface RTC Phonebook Management Internal TCP IP stack to enable internet via GPRS Supports SMS as well as DATA transfer application in M2M interface As far as design concerned it is very compact design and easy to use Widely used in wireless communication project...

Page 3: ...upply 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 Supports CSD USSD SMS FAX Group 3 Class 1 Single SIM card and SMA connector with GSM Antenna Serial port RS232 output and supports for Audio interface RTC Phonebook Management ...

Page 4: ...Connection Details ...

Page 5: ...tage Range 0V to 2 8VDC 7RTC X2 2 Power Supply for RTC 3VExternal Battery 8DTX X2 3 Debug Tx for debugging and upgrading firmware 9RTX X2 4 Debug Rx 10GND X2 5 Ground CircuitGround 11 5V X2 6 5VDCOut Pin 5DC200mAMax 12POUT X3 1 NC 13DTR X3 2 DataTerminal Ready 14DCD X3 3 DataCarrier Detect 15DBR X3 4 NC 16CTS X3 5 Clear to send 17RTS X3 6 Request to Send 18SCL X4 1 I2CSerial Bus Data 19SDA X4 2 I2...

Page 6: ...udrate 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 AnswerCall command ATA Reply OK DisconnectCall command ATH Reply OK ...

Page 7: ...MGS 91 975648XXXX This is a test SMS Ctrl z Reply CMGS 45 OK Read SMS location no 1 command AT CMGR 1 Reply CGMR REC UNREAD 91 975648XXXX 02 03 15 20 30 31 00 This is test SMS OK Read SMS location no 2 command AT CMGR 2 Reply CGMR REC UNREAD 91 975648XXXX 02 03 15 20 30 31 00 Hello how are you test SMS OK ...

Page 8: ... CMGL ALL Reply CGML 1 REC READ 91 975648XXXX 02 03 15 20 30 31 00 This is test SMS OK CGMR 2 REC UNREAD 91 975648XXXX 02 03 15 20 30 31 00 Hello how are you test SMS OK 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 ...

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