Setserial sets and/or reports the configuration information associated with a serial port. This information includes what I/O port and which IRQ a particular serial port is using.

This version has a completely new approach to configuration, so if you have a setup other than the standard ttyS0 and 1, you will have to get your hands dirty.

By default, only ttyS0-ttyS3 (COM1-4 in DOS/Windows terminology) are configured by the kernel, using IRQ 3 and 4. If you have other serial ports (such as an AST Fourport card), or if you have mapped the IRQs differently (perhaps COM3 and 4 to other IRQs to allow concurrent access with COM1 and 2) then you must have this package.


For USB, instead of setserial, the usb-storage and/or usbserial modules must be loaded, whether manually or by HAL is up to you and/or your system.

# modprobe usb-storage
# modprobe usbserial
$ sleep 6 # the modem may take a while to initialize
$ ls /dev/ttyUSB*

You should see three renditions of ttyUSB. If not, we will get to that later. This is a "Quick Start" after all, no? The ports:

ttyUSB0 - The modem 
ttyUSB1 - USB? 
ttyUSB2 - Nothing 

So, you can use Modem = /dev/ttyUSB0 in your wvdial.conf file (there is a problem if you are use the Ubuntu Live CD: you cannot save, and so use, the modified file, because CD-ROMs are read-only media).

See DialupModemHowto/Huawei


seserial with -g option help to find out what physical serial ports your Linux box has.


Once serial ports identified you can configure Linux box using various utilities:

  • wvdial or other GUI dial up networking program - a PPP dialer with built-in intelligence, installed in Ubuntu.

  • minicom -the best friendly serial communication program for controlling modems and connecting to dump devices.

  • getty / agetty - agetty opens a tty port, prompts for a login name and invokes the /bin/login command.
  • grub configuration - To configure serial port as the system console.

CategoryNetworking CategoryHardware

DialupModemHowto/Setserial (last edited 2008-06-27 10:15:14 by localhost)