code for gsm modem interfacing to 8051

Before going to the program please understand the GSM module, hope you know that it works with AT commands
Try these commands on GSM module by connecting to PC's hyperterminal

Examples>>

TO CHQ GAIN - AT+CSQ=?
TO CHK NETWORK - AT+COPS=?

Examples for send and receive SMS

For sending SMS in text Mode:

AT+CMGF=1 press enter
AT+CMGS=”mobile number” press enter
Once The AT commands is given’ >’ prompt will be displayed on the screen.
Type the message to sent via SMS. After this, press ctrl+Z to send the SMS.
If the SMS sending is successful, “ok” will be displayed along with the message number.

For reading SMS in the text mode:
AT+CMGF=1 Press enter
AT+CMGR= no.
Number (no.) is the message index number stored in the sim card. For new SMS, URC will be received
on the screen as +CMTI: SM ‘no’. Use this number in the AT+CMGR number to read the message.
Voice call
Initiating outgoing call:
ATD+ mobile number; press enter
For disconnecting the active call:
ATH press enter
For receiving incoming call:
ATA press enter

Before going to the program please understand the GSM module, hope you know that it works with AT commands
Try these commands on GSM module by connecting to PC's hyperterminal

Examples>>

TO CHQ GAIN - AT+CSQ=?
TO CHK NETWORK - AT+COPS=?

Examples for send and receive SMS

For sending SMS in text Mode:

AT+CMGF=1 press enter
AT+CMGS=”mobile number” press enter
Once The AT commands is given’ >’ prompt will be displayed on the screen.
Type the message to sent via SMS. After this, press ctrl+Z to send the SMS.
If the SMS sending is successful, “ok” will be displayed along with the message number.

For reading SMS in the text mode:
AT+CMGF=1 Press enter
AT+CMGR= no.
Number (no.) is the message index number stored in the sim card. For new SMS, URC will be received
on the screen as +CMTI: SM ‘no’. Use this number in the AT+CMGR number to read the message.
Voice call
Initiating outgoing call:
ATD+ mobile number; press enter
For disconnecting the active call:
ATH press enter
For receiving incoming call:
ATA press enter

i am trying to control the operation through the mobile wirelessly through sms and nt through the hyper terminal

i am trying to control the operation through the mobile wirelessly through sms and nt through the hyper terminal

you will control some operations using SMS right?
Then how you will read received SMS(containing control operation) to GSM from the mobile?
So try out some commands to read SMS as I have sent it in previous post, then start reading for that same SMS and control devices

ok thanks i will try it but do i have to send the at command as an sms

do i have to send the at command as an sms
NO
send simple control message from mobile to GSM and read the same using GSM module(using "AT+CMGR=no." command) then do the operation depends on message content

Think about it: what is your system (the 8051+modem) going to do with the message when it receives it...?

The OK just indicates that the AT Command was accepted by the modem - it does not indicate succesful transmission of the message!

The message is not confirmed as sent until you subsequently receive the Message Reference (MR) number.

But the OP's project is receiving the message - not sending it.

Thanks for the reply.
After receiving the control messegage it will operate the appropriate relay.

got it i will try accordingly.

You do realise, don't you, that there are dozens - possibly even hundreds - of projects already published on the internet which do exactly this?

Did you spend any time researching prior art?

www.lmgtfy.com

i tried it but am not able to get any code

Oh dear - so you might actually have to get down and write some of your own, then...?!

hi..i am also working for the same kind of project..can you help me for the code plz...