[SOLVED] getting problem in reading the response of AT commands

[shashank07]

hello,
I am doing project in which i am interfacing GSM module with ARM7. I am writing code using Keil s/w. In this project i am able to send AT commands in c language successfully but i am unable to read the reply from modem.
can anybody help me!!!!!

 

[horace1]

check the baud rate - it is usually 9600baud
if you have an oscilloscope check you are transmitting the AT commands OK and see if there is any reply

 

[shashank07]

hey thanks for your reply i check out that baud rate is 9600 actually i am interfacing lcd in my project so after sending AT gsm should send ok but some garbage is showing on lcd plz help

 

[g_shyam1682]

Hi friend,

GSM module send OK responce of AT command with carriage return(0x0D) and Line Feed(0x0A) value before and after of responce like
"\n\rOK\r\n"

Check Is your lcd garbage data 0x0D or 0x0A?

Read Data sheet of GSM module carefully.

Best of Luck

 

[shashank07]

Thanks buddy
I check it out today i am getting 'A' on my display what that mean? can i consider it as 'OK'?

 

[g_shyam1682]

Hi friend,

GSM module send response in ASCII formet and your LCD module also understad ASCII formet.
To display on lcd, you should send ASCII formet of your data means to display 'A' you must send 0x41.

Finally, if GSM module send OK response, then your LCD also clearly display _,_,O,K,_,_.

Hope this is help you,
Ghanshyam Dudhat
07891231301(feel free to call me)