Festo fc34 PLC problem to download the program in controller

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Hello i'm new in all things about plc, i do a project for school and i use a festo fc 34 plc. The plc is programmed via serial port RS232 my pc not support a serial interface and i use a RS232 to usb adapter. when a try to download the program to plc give me a error: "ERROR: Cannot access controller".  What i do wrong.  Thank you in advance and sorry for my English. Have a nice day.20151219_151058.thumb.jpg.261b169888550eCapture.thumb.PNG.9a7f559f04949c97a43ed9

Edited by mihaiciprian17

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most probably you need a full connection between the program interface and the usb adapter

does your computer detect de usb adapter at the  device manager?

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