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Problem in Interfacing controller(MC1322x ) and GSM Module(GL865)

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nlsatish26

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Hi,
I am interfacing controller(MC1322x) with GPRS modem(GL-865).

I did the following-
1. Program MCU to send AT command using UART (printf) and receive the response using scanf function.
2. Connect the serial cable from MCU to (Max 232)gprs modem serial port.
3. reset the MCu to send the AT command to GPRS module.

But I got no response from the GPRS module. Did I miss anything? Do I need extra initialisation? Or anything else?
TTL logic of controller board(Rx and Tx is 2.8V logic) which is ideal to communicate with the GSM Modem but I'm not getting any response from the modem

My simple code to send AT command is (IAR)
 

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