PIC16f877A Sending SMS (AT commands) to Siemens C55

terminal 2 Rx pin is connected to Tx of pic it is ok
remove its Tx pin because ur not using it
use another hyper terminal connect that Rx pin with Rx pin of pic now on this terminal u can see the response of mobile
AT u see is that is sent by the pic ur not seeing the response of mobile in response of AT.

yes i did them, now can i communicate proteus simulation with laptop's COM port which i connect C55?

yes i did them, now can i communicate proteus simulation with laptop's COM port which i connect C55?

yes.. if your phone is using com1 then set your compim also as com1...

but my phone is using com 5,6,8,9 and compin show meonly com1,com2,com3,com4 there are no other coms, im changin them to my coms it becomes default again :S

go to device manager and edit the port setting of your phone so that you can point it to any ports available of the compim..

ok i did your comments, but i cant see the response of "AT". Is that about delays in C program?

the last c code is:

i changed code to send sms, i send AT with hyperterminal then gets OK, after all in simulation program i send only AT+CMSS=1, sms sent but i want to see "AT" ,"OK" then "AT+CMSS=1" one by one in proteus simulation. how can i do that. thx.

what did you do?

first start a simple program that would transmit AT to the phone if you can see the OK response of the modem.

in your protues monitor the rx and tx pins so that you can verify if the mcu is transmitting the command and if modem is replying the command sent by the mcu..