GSM modem with keyboard

[Guest3]

Hi to all forum users !

I have question about gsm modul and pic communication.
I read some examples on the forum but thats not quite what i need.

The gsm modul is connected to keyboard and to serial port of my device.
User can enter end send some text, just like in some cellular phone.

The serial port device - SPD - power rangers :-) should pick up each action started when the terminal is accessing the smartcard. It's basically device which will in future be used as monitor.

a.)
Because the smartcard I/O wire is bidirectional, can i use just the RX line of the pic to collect all the passed data ?

b.)
how to know what kind of data is been send.
Was there a keystroke or other data.

I know i have to set the read speed at 9600, 1, 8, E to receive all the characters. So i was thinking to check the whole atr stage and then wait for keystroke ( if any ).

What would you suggest ?