my sim900D keep on restarting itself, will installing customer flash loader solvethis

hi ,
i am new to the GSM world , i am working on a SIM900D gsm.

i've serially connected the modem using mikroElektronika PIC board to my laptop, and i've tried to send it AT commands using different terminals but even if the COM port opens the GSM keeps on restarting itself and sends things similar to this:
NORMAL POWER DOWN
üüýýÿÿÿÿ
RDY
+CFUN: 1
+CPIN: READY
Call Ready
and then keeps on re-sending it.
would installing the customer flash loader solve this?

can anyone please help
thank you

You should check your power supply first,then try to update the firmware.

Hi Sara,

First check the power supply both voltage and current rating.

If everything is fine, and still the modem reboots, then update the firmware of the GSM module.

Dear Sir,
thank you apparently i had a voltage error ...

I need another help i have a GSM SIM900D and pic16f877a can you please suggest a project

thank you

Google it up you will get n number of projects based on GSM...

ok thank you ... am sorry but i am a beginner ...
when interfacing pic with the gsm do i need to use zigbee/xbee ... (is it a must)
i am just testing and trying to send from the gsm to the PIC to turn on a light

thank you

Sara,

First you must be very clear about RF operating frequency ranges...

SUB-GHZ, GSM, CDMA, ZIGBEE all operates at different frequency...

Zigbee has no connection with GSM...As zigbee is 2.4GHz and GSM - 900/1800 MHz....

First of all, get hands on experience of the GSM using PIC Controller...

For example, in the PIC use UART interrupt to capture the responses given by the GSM module...

Validate the responses in your MAIN() function inside while(1) loop...

May be you can try few things as said below:

1. Do not send any command to the GSM module until you get CALL READY in the UART...
2. Try sending SMS using your controller.
3. Try to activate GPRS and get the IP for data transfer.
4. Try TCP IP data transfer making your GSM as SERVER by putting it in SERVER LISTENING MODE...There is a TCP TEST TOOL software where you can test this...
5. Similarly write codings to read the SMS from the GSM module and take action accordingly if warranted or delete the sms using your controller...

You can try it out and see yourself...