Plug in the USB-Serial Port adaptor to one of your USB port, wait for a couple of second, then run:

[pensacola@pensacola-tech ~]#dmesg

The output should be something like this:

usb 2.0: new full speed USB device using uhci_and address 2

usb 2.0: configuration #1 chosen from 1 choice

Then unplug the device and type:

[pensacola@pensacola-tech ~]#lsusb

The output should be similar to this:

Bus 003 Device 001: ID 0000:0000

Bus 002 Device 007: ID 03f0:4f11 Hewlett-Packard

Bus 002 Device 006: ID 05e3:1205

Bus 002 Device 004: ID 15d9:0a33

Plug in the USB-Serial Port converter back, and run “lsusb” again, and you will see
an additional line, like this:

Bus 003 Device 001: ID 0000:0000

Bus 002 Device 007: ID 03f0:4f11 Hewlett-Packard

Bus 001 Device 002: ID 4348:5523 — — — the additional line

Bus 002 Device 006: ID 05e3:1205

Bus 002 Device 004: ID 15d9:0a33

At this point we have the vendor id and the product id of the USB-Serial Port converter, this will enable us to load the linux kernel module “usbserial” to activate the device.
[pensacola@pensacola-tech ~]#sudo modprobe usbserial vendor=0x4348 product=0x5523

After that run again:

[pensacola@pensacola-tech ~]#dmesg

… the output:

usbserial_generic 2.0:1.0: generic converter detected

usb 2.0: generic converter now attached to ttyUSB0

usbcore: registered new interface driver usbserial_generic

Now, the new serial port device is mapped to /dev/ttyUSB0.

Note:  You can instruct Ubuntu to load this module automatically by include the line :  “usbserial vendor=0×4348 product=0×5523 inside “/etc/modules” file.

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