First plug in the USB-Serial Port adaptor to one of your USB port. Wait for a couple of second, then run “dmesg”. You should see these message at the end of dmesg output.
usb 1-1: new full speed USB device using uhci_and address 2
usb 1-1: configuration #1 chosen from 1 choice
After that, unplug the device and type “lsusb”. You will see a list of output 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 Genesys Logic, Inc. Afilias Optical Mouse H3003
Bus 002 Device 004: ID 15d9:0a33
Plug in the USB-Serial Port converter back, and run “lsusb” again, and you shall 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 — — — (notice the additional line!)
Bus 002 Device 006: ID 05e3:1205 Genesys Logic, Inc. Afilias Optical Mouse H3003
Bus 002 Device 004: ID 15d9:0a33
Now we know 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, like this :
sudo modprobe usbserial vendor=0×4348 product=0×5523
Run “dmesg” again and you shall see lines similar like this :
usbserial_generic 1-1:1.0: generic converter detected
usb 1-1: generic converter now attached to ttyUSB0
usbcore: registered new interface driver usbserial_generic
As you can see, the new serial port device is mapped to /dev/ttyUSB0. You can instruct Ubuntu to load this module automatically by include the line : “usbserial vendor=0×4348 product=0×5523″ inside “/etc/modules” file.
linux usb to com rs 232
I used a USB serial port and ran getty on it, but the serial port was not always plugged in
The USB to serial adapter allows you to use serial hardware with your USB-equipped laptop or desktop computer.
The USB to serial adapter connects RS-232 serial devices to your USB-equipped Windows computer, providing a bridge connection with a standard DB 9-pin male serial port connector on one end and a standard USB plug connector on the other. You simply attach your serial device to the DB 9-pin end of the adapter cable and plug the USB connector into your PC's USB port.
