Help, Please....! :-( it is about numbers.

i have a problem with decimal numbers in the following code. i use rs232 port to read data from pc. and i want to take a number like "128" as in visual basic. i wrote,

sonuc = sonuc1 & sonuc2 & sonuc3

but for example, sonuc = 49 ????????
i couldn't do it. how can i take a number like "154" ?
i used serin2 but, i couldn't read data from rs232.

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SERIN PORTB.0,N9600,2000,HATA,["P"]
SERIN PORTB.0,N9600,sonuc1
SERIN PORTB.0,N9600,sonuc2
SERIN PORTB.0,N9600,sonuc3

lcdout $fe,$c0,#sonuc '<======= i want to write this number on lcd

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