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Gsm modem and handshake

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tofigg

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hello people i'm working on GSM SIM300C MODEM and try to read the message and then do some controlling for relays, i wrote my code and its totally working in simulation and hayperterminal, and i have test the gsm modem and its also working with hayperterminal but when i connect my sim300c modem to my pic16f887 using null modem which is my TX->RX ... RX->TX and pin5 to ground, its not working but after run few tests i figure out i can only command the gsm modem like delete the SMS but not able to read it. i tried handshake protocol (plz check the attached file) but still not working plz if anybody have experience with sim300c post comments here thank you so much.

sim300c

not parity bit
1 stop bit
at+ipr=9600
AT+IFC=0,0
 

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