Interface a GSM Modem and 8051 and retrieve decoded SMS

Please use the Search facility and search for "GSM modem" - everything you need has been discussed already; most of it quite recently!

"Is there any way in which I can interface a GSM modem with a 8051"

The one and only way that you can interface anything to a GSM modem is to use its serial port - the modem neither knows nor cares whether it's a terminal, a PC, an 8051, or anything else that's connected to that port.

What do you mean by "encoded" SMS?

"And I think the GSM module should have some kind of decoding code (using this would be benificial and reduce code complexity for 8051)"

Have you looked at Wavecom's Open-AT, and the embedded scripting facilities from other manufacturers?

Hmmm.... the 'Search' seems to be broken at the moment!

It just says, "There is no catalog."

"...even if i can get the encoded SMS from the GSM modem using AT commands..."

What do you mean by "encoded"?

Are you talking about PDU format?

If so, unless you're talking about some really ancient and/or crude model, I've never used a GSM modem that can't be set to TEXT mode.

"the decoding complexity is very high for a 8051."

Just Decoding PDU to TEXT is really not that complicated - it's basically just a lot of shifting.
Certainly not a problem for an 8051.

If you're talking about some other encoding, of course, that might be different...

"I think the GSM module should have some kind of decoding code"

See above.

So... can we directly retrieve the SMS in text format from the GSM module?

what change of configuration is required?

Basically, I was referring the PDU format as encoded SMS.

Is there any means by which i can access the previous discussion u hav mentioned?

"can we directly retrieve the SMS in text format from the GSM module?"

Almost certainly yes - see the module's Manual for details.

"Is there any means by which i can access the previous discussion u hav mentioned?"

Yes - the 'Search' is now working again!

Dear sir,
I am able to send all the commands through the controller
and also able to receive the response from the GSM module.
The problem is when i send SMS through the controller
i am not able to receive the response.
i sent AT+CMGF=1 from the controller and received OK response.

But when i send AT+CMGS="PHone number" and send the SMS text message and send CTRLZ i am receiving ERROR response.

Is there is any data to be sent after CTRLZ
Regards
sapthagiri

"when i send SMS through the controller I am not able to receive the response."

Does it work when you do it manually through Hypoterminal (or similar)?

After sending the AT+CMGS="PHone number", you need to wait for the '>' prompt before you send the text of the message.

"i am receiving ERROR response"

Use AT+CMEE=1 to enable extended error incidations, then look-up the error code...

Dear sir,
After sending the Phone Number I am waiting for > Promt.
I am getting this Promt also.
But when i send the Text message and send CTRLZ
i am receiving the ERROR response.

Allthe commands including the SMS working on hyperterminal.

Sir,I checked AT+CMEE=1 , i iam getting +CME=100
I saw the manual for this error and i found it was unkown.

Regards
sapthagiri

If it works on Hypoterminal, but not from your code, you need to examine the differences!

One obvious difference will be timing - a microcontroller can send commands much faster than you can type them!
As a first step, try adding some delays.

Also, be sure that your code is sending exactly the same as Hypoterminal - especially things like line-endings (CR or CRLF?)...

AS FAR AS I AM AWARE, REFERENCES TO <BOLD><ITALIC>HYPOTERMINAL</ITALIC></BOLD> SHOULD BE READ AS <BOLD><ITALIC>HYPERTERMINAL</ITALIC></BOLD>

You're doing it again!

You really do need to pay attention to the 'Preview' - your Bold & Italic formatting didn't work either, did they?!

Yes, "Hypoterminal" (sic) is a malapropism - a deliberate error for humourous effect:
"
Presumably, they called it "Hyper-terminal" to give the impression that it's "so much more" than a plain old terminal.
en.wiktionary.org/.../Hyper-

But many would agree that "Hyperterminal" is a rather poor terminal - it has too many quirks, limitations, and annoyances.
Hence I call it "Hypo-terminal" to indicate its deficiencies:
en.wikipedia.org/.../Hypo

I don't know if you're the first to notice this, but you're certainly the first to comment!

Andy isn't the only one to write Hypoterminal on this forum. I think it's the most common name used.

I tend to use the correct M$ (see, I also like to change some names (: ) name, just to make sure that there is no single way of understanding what program to use.

"Andy isn't the only one to write Hypoterminal on this forum."

And there was me thinking I was being original!
Foiled again! :-(

In fact, I did a quick search, and found that "Hypoterminal" is quite widely used on many other forums...

Dear Sir,
I have given delay of 2 sec after every command sent to receive the response.
I have changed the Baud rate to 9600 using AT+IPR=9600 command.
Still i am getting the same Error.
i saw the commands sent from the controller to GSM on the Hyperterminal and the commands what i send through the controller is exactly same as from the hyperterminal.

Regards
sapthagiri

what is wrong with this code plese

unsigned char mmc_init(void)  {  unsigned int i;  unsigned char response;    MMC_CS_TRIS=0;   MMC_VCC_KEY_TRIS=0; //out  MMC_VCC_KEY=0; //MMC power ON MMC_DOUT_TRIS=1; //input MMC_DOUT_TRIS = 1; // dout as input. MMC_CS_TRIS = 0; // CS as output. MMC_CLK_TRIS = 0; // CLK as output. MMC_DI_TRIS = 0; // DI as output MMC_CLK = 1; mmc_powerup(); mmc_unselect(); for(i = 0; i < 10; ++i) mmc_read_write(0xFF); /* address card */ mmc_select(); /* reset card */ for(i = 0; ; ++i) { response = mmc_send_command_r1(CMD_GO_IDLE_STATE, 0); if(response == 1) break; if(i == 0x1ff) { mmc_unselect(); return 0; } } /* wait for card to get ready */ for(i = 0; ; ++i) { response = mmc_send_command_r1(CMD_SEND_OP_COND, 0); if(!(response & 1)) break; if(i == 0x7fff) { mmc_unselect(); return 0; } } /* set block size to 512 bytes */ if(mmc_send_command_r1(CMD_SET_BLOCKLEN, 512)) { mmc_unselect(); return 0; } /* deaddress card */ mmc_unselect(); raw_block_address = 0xffffffff; if(!mmc_read(0)) return 0; return 1; }