Hi to all...
I am doing a project in which i will be interfacing a gsm modem with PIC microcontroller(16f877).. when i connect the gsm modem with PC i can able to send and read the messages in the sim using AT commands in hyperterminal...Then i iniatized UART in PIC send and received data to PC through hyperterminal its working properly...
When i interfaced PIC with GSM Modem i can able to send AT command to GSM modem but the reply "OK " from GSM modem to PIC is not received by PIC...

Example:

AT (Enter)-----In Hyperterminal
OK ------Message from GSM Modem

Compiler:MikroC
Baud Rate:9600 bps
GSM MOdem:Wavecom HT-W2101

I can able to send AT and Enter command from UART to PIC... But i cant able see the reply from GSM modem... but it works well when i interface GSM modem with PC hyperterminal...

Help me... Small Bio

[quote=Barbara post_id=126 time=1487767099 user_id=76] Hi to all...
I am doing a project in which i will be interfacing a gsm modem with PIC microcontroller(16f877).. when i connect the gsm modem with PC i can able to send and read the messages in the sim using AT commands in hyperterminal...Then i iniatized UART in PIC send and received data to PC through hyperterminal its working properly...
When i interfaced PIC with GSM Modem i can able to send AT command to GSM modem but the reply "OK " from GSM modem to PIC is not received by PIC...

Example:

AT (Enter)-----In Hyperterminal
OK ------Message from GSM Modem

Compiler:MikroC
Baud Rate:9600 bps
GSM MOdem:Wavecom HT-W2101

I can able to send AT and Enter command from UART to PIC... But i cant able see the reply from GSM modem... but it works well when i interface GSM modem with PC hyperterminal...

Help me... [/quote] Hi Wilksey...
Yes.. I have used max 232 IC to do level shifting operation...

One thing i would like to know is what will be the return message from GSM modem when i send AT and then press enter command.. When i connect GSM MOdem to hyperterminal it returns OK...
Otherwise you can consult the tutorial: [url=http://www.theengineeringprojects.com/2015/04/send-sms-pic-microcontroller-sim900.html]how to send SMS with PIC Microcontroller and SIM900[/url] Comment Bio