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Gsm to phone at commands..

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asmarhussain

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Hi Friends.
My Project is Mobile telemetry system..to Send digital value of digital panel meter to GSM modem(from Microcontroller which stores data of 24 hours=average of 3 hours) and send to Specific mobile phone.Can any one help me When mobile calls to gsm Modem,,what are the AT commands gsm uses to send microcontroller data to Mobile phone back..
 

You need to download AT command pdf for the modem you are using and start testing its functionality with hyper terminal and get used to the AT commands.......
 

Thanks for both reply..
i mean to say is there any way that as i call to gsm modem,it automatically send microcontroller data to mobile phone??
 

The only way to communicate with the GSM MODEM is by its AT-Commands.
 

Hi amsar,
Connect the modem with uCr through UART, with the help of timer in the uC continously monitor the modem response
When call comes to the modem some response wii be generated by modem(e.g. +cring for wavecom modem). with that as trigger send the data through SMS or GPRS with the help of AT commands.
 

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Thanks alot bro
what do you mean by uC and uCr?
mean i have to connect usart before modem,i need that when call come to GSM Modem it responce back to that mobile and sends the current data stored in microcontroller reply as call back to that number or recieve that incoming call from person and reply the digital numbers in audio form..
 

Hi asmar,
I meant microcontroller as uC, i think you got it.
 

Thanks e shade
kindly give a suggestion about this
I need that when call come to GSM Modem it responce back to that mobile and sends the current data stored in microcontroller reply as call back to that number or recieve that incoming call from person and reply the digital numbers in audio form..
 

with the help of AT commands itself you can reply back,Can you mention the type of modem and micro controller which you are using?
 

Actually the modam can communicate with ur controller through UART
u need to download the at commands for ur modem(The at comands are most oftnly a standardized syntax )

u will get a variety of modems from different manufactures eg Huawei
 

what do you mean by uC and uCr?
mean i have to connect usart before modem,i need that when call come to GSM Modem it responce back to that mobile and sends the current data stored in microcontroller reply as call back to that number or recieve that incoming call from person and reply the digital numbers in audio form..
Click to expand...

Here you are the procedure in steps:
1- Connect your MODEM to the controller using MAX232 interface circuit.
2- When your controller detects an incoming call, it will extract the phone number.
3- Using the extracted phone number, the controller will send a message to this number with the data you want.

You will have to check your MODEM's datasheet regarding the AT-Commands used in steps 2,3.

Hope this helps.
 
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