hi!Does anyone know how to write code sending sms after reply OK on at89c51????

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Ni yanfang

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Hi. I am using gprs/gsm modem (Q2403). max232 and at89c51. all connect already, I have no ideas how to write code for sending sms, then microcontroller will receive OK . all my port o of AT89c51 connect with DB0 to DB7 of LCD1. And my port 2.0 of AT89c51 connect with RS of LCD1. port 2.1 of AT89c51 connect with R/W and port 2.2 connect with E of LCD1.
Please anyone help??? any sample code??
 

Hi, MAX232 is already connected to the controllers serial port know?? If so u just need need to write a code for sending SMS. Use the command AT+CMGS.
 

can you post me code here please?

- - - Updated - - -

Yes all setting is OK. But I need to write c language on sending sms after reply OK on at89c51 using AT command.
If you do not knoe about AT command. can you just post the code.
 

Code: 
void sendSms(char *msg) {
    UART_Send("AT+CMGS=\"0300xxxxxx\"");     //0300xxxxxx is supposed to be the destination number
    delay_us(2);             // wait for '>' to appear    
    UART_Send(msg);      // send the msg string
   UART_Sendchar(0x1A); /send ctrl+z to signal end of msg  and wait for OK from gsm module 
}

i assumed that you can write UART based functions yourself
 
OK Thanks.
 

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