USB to Serial Convertor ATEN uc 232a

I am using Aten UC232A Converter to communicate with my micro-controller device using 3 wire interface ie txd, rxd and ground. Though the converter gets detected and driver loaded in my suse11.2. The operation does not work. following are the logs.

any help?

drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303
pl2303 4-2:1.0: pl2303 converter detected
usb 4-2: pl2303 converter now attached to ttyUSB0
usbcore: registered new interface driver pl2303
drivers/usb/serial/pl2303.c: Prolific PL2303 USB to serial adaptor driver
pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
pl2303 4-2:1.0: device disconnected
pl2303 4-1:1.0: pl2303 converter detected
usb 4-1: pl2303 converter now attached to ttyUSB0

stty :

speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
-isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke

Make sure that the handshake lines CTS/RTS, DTD/DCD are looped back properly to let the serial interface know that it’s ok to transmit and receive data. A search should be able to find you the required loopbacks.

They are actually connected. I doubt whether being an attachment to usb does it need registration through a vendor product Id like stuff.(the m/c).