T191 unlock cable

Hi This is my first mail to this list. I have downloaded the code and compiled it. My development environment is Eclipse using cygwin as I am a Windows user. I have succeeded in procuring Motorola C115 phone and also T191 unlock cable but the cable has a serial port on one end and 2.5 mm audio jack at the other. My laptop doesn't have a serial port. It only has USB ports. What sort of USB to serial converter should I use? I have not enquired the cost of FDTI cables in India. But they seem to cost a fortune online. Please do suggest one that is cheap say within 200 rupees. I am also having difficulty downloading Iota and Rita data sheets as the links provided in the wiki lead to chinese sites and I don't understand chinese. Can some one who has already downloaded them please tell me the process like which buttons I need to click etc. Regards, RM