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interfacing 8051 with SIM300CZ

Hi, I am interfacing 8051 with SIM300CZ. SIM300CZ has serial interface through which 8051 gets connected and sends AT commands. SIMCOM's serial interface works on TTL logic and 8051 also works on TTL logic so not using level converter. I need the details of handshaking signals required to write my program for 8051. I need the voltage level details for DCD, DTR, RTS, CTS, RI pins so that I can use GPIO pins of 8051 for handshaking.

Please elaborate the serial handshaking pattern so that I can write my code for handshaking accordingly.

Fast response is required & appreciated.

Rgds
Sam

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