USB to serial cable

Could somebody give me some help in recognizing a USB serial connection. I am using 9.1 and KDE 3.3. Case. I have a camera which still has to be connected via a serial connection. As I have problems with my second serial port (cable or irq) I thought it would be a nice idea to use a usb serial cable. Connecting my camera and switching it on did nothing which was no big surprise because hotplugged devices are not any more found in the (former) "My computer " button but at media there is nothing new either. How can I activate the new usb attached device and where should I find it hotplugged?