Using the TS-9449
The TS-9449 is autodetected by most recent operating systems using the FTDI serial to USB chipset. In Linux, this is the ftdi_sio driver. Upon inserting this to your workstation you can get the device name from dmesg. The dmesg output is chronological order so the last output should show the connection:
usb 2-2.1: new full speed USB device using uhci_hcd and address 4 usb 2-2.1: New USB device found, idVendor=0403, idProduct=6001 usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 2-2.1: Product: FT232R USB UART usb 2-2.1: Manufacturer: FTDI usb 2-2.1: SerialNumber: A501BUBF usb 2-2.1: configuration #1 chosen from 1 choice USB Serial support registered for FTDI USB Serial Device ftdi_sio 2-2.1:1.0: FTDI USB Serial Device converter detected usb 2-2.1: Detected FT232RL usb 2-2.1: Number of endpoints 2 usb 2-2.1: Endpoint 1 MaxPacketSize 64 usb 2-2.1: Endpoint 2 MaxPacketSize 64 usb 2-2.1: Setting MaxPacketSize 64 usb 2-2.1: FTDI USB Serial Device converter now attached to ttyUSB1 usbcore: registered new interface driver ftdi_sio ftdi_sio: v1.5.0:USB FTDI Serial Converters Driver
So in this case my device is "/dev/ttyUSB1". These are allocated numerically so if you do not have another usb serial device it may be "/dev/ttyUSB0". If you do not see this device you will need to see your distribution's support for adding the ftdi_sio driver. New versions of Ubuntu/Debian/Fedora and most popular distributions include this by default.
If you're in Windows XP or above the USB FTDI driver will be autodetected if you allow it to search for drivers on Windows Update. If you go into "Device Manager" you will see the COM# device that was allocated.
In this example, my COM device is COM5.