minicom stays offline

I have Fedora 15 PC and tried to open minicom for serial terminal access. However minicom stays offline even though I set serial device to the correct one, dev/ttyUSB0. I'm using usb uart adaptor with cp201x drive. When I use the same usb uart adaptor in Windows and use tera term to open up serial terminal. It works fine. Can anyone please help me why minicom stays offline in FC15??

5.530448] usbcore: registered new interface driver usbserial
[ 5.530460] USB Serial support registered for generic
[ 5.530480] usbcore: registered new interface driver usbserial_generic
[ 5.530481] usbserial: USB Serial Driver core
[ 5.538998] USB Serial support registered for cp210x
[ 5.539008] cp210x 1-1.3:1.0: cp210x converter detected
[ 5.601115] usb 1-1.3: reset full speed USB device using ehci_hcd and address 3
[ 5.686774] usb 1-1.3: cp210x converter now attached to ttyUSB0
[ 5.686786] usbcore: registered new interface driver cp210x
[ 5.686788] cp210x: v0.09:Silicon Labs CP210x RS232 serial adaptor driver