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CODE:

printf("AT+CMGS=\"98xxxxxxx8\"");
printf("%c", 13);
printf("This is a test msg");
printf("%c", 26);

delay();
scanf("%s", response);

delay();
LCD("Done: ");

delay();
LCD(response);
 


The SMS is sent successfully, but the response returned by modem is always displayed as AA on the LCD display. But the response should be OK instead as the modem returns the following response when the SMS is sent successfully:

CODE:
+CMGS: 132

OK
 


I tried sending the SMS from hyperterminal with modem using the same command i.e. AT+CMGS, after sending the SMS the modem returns

CODE:
+CMGS: 132

OK
 


Then why the same is not returned in case of 8051??

I also tried to debug by interfacing 8051 to the hyperterminal. The command sent by 8051 display successfully on hyperterminal, when I send something in response to the command from hyperterminal then the same is displayed properly on the LCD.

Then what is the problem with Wavecom modem and 8051, why the response sent by modem is not displayed properly on the LCD?

Can anyone please help me on this!
]]> Sat, 02 Aug 2008 07:39:13 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html printf("ATE0\r\n");

CODE:

printf("ATE0\r\n");
delay();

printf("AT+CMGS=\"98xxxxxxx8\"");
printf("%c", 13);
printf("This is a test msg");
printf("%c", 26);

delay();
scanf("%s", response);

delay();
LCD("Done: ");

delay();
LCD(response);
 


Now the LCD displays ">" instead of "AA"]]> contact@nospam.com (Ajay Bhargav) Sat, 02 Aug 2008 08:38:09 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html
Now when I added one more scanf("%s", response); the following code is now displaying "+MSG" instead of ">"

CODE:

printf("ATE0");
printf("%c", 13);
delay();

printf("AT+CMGS=\"9872808428\"");
printf("%c", 13);

printf("This is a test msg");
printf("%c", 26);
printf("%c", 13);

scanf("%s", response);
scanf("%s", response);

delay();
LCD("Done ");

delay();
LCD(response);
 


But how..? I am so much confused....

Lets assume everything is going fine, but still it should return +CMGS instead of +MGS.

And in case of "EROR" is displayed instead of "ERROR".

The second character is never show and disarded...

What is happening.. can anyone help..!]]> contact@nospam.com (Ajay Bhargav) Sat, 02 Aug 2008 11:25:15 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html I would suggest creating a custom function for serial RX/TX instead of printf/scanf.
Since printf is working OK(sms sent successfully) you could try writing a serial rx function for now.
Else try scanf with hyperterminal,just to confirm...]]> contact@nospam.com (Ajay Bhargav) Sun, 03 Aug 2008 20:03:25 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html +GMGS: 132 is counting of messages sent from the modem, It will be last upto 255 and will start again from "0" as it complete 255. You can either ignore this and can only rely on OK.]]> contact@nospam.com (Ajay Bhargav) Mon, 04 Aug 2008 03:31:35 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html
But if I watch output on Hyperterminal it is +GMGS:

Can anyone guide me through this!]]> contact@nospam.com (Ajay Bhargav) Mon, 04 Aug 2008 04:24:59 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html
and may be it sends OK instead of AA

what i mean is I will prefer that portion os the code when u are displaying the scanned response!
]]> contact@nospam.com (Ajay Bhargav) Mon, 04 Aug 2008 08:27:52 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html
shyam wrote ...

what i mean is I will prefer that portion os the code when u are displaying the scanned response!


Prefer means??]]> contact@nospam.com (Ajay Bhargav) Tue, 05 Aug 2008 00:30:01 -0700 http://www.8051projects.net/forum-t11328.html Re: GSM Modem response http://www.8051projects.net/forum-t11328.html ]]> contact@nospam.com (Ajay Bhargav) Tue, 05 Aug 2008 09:07:38 -0700 http://www.8051projects.net/forum-t11328.html