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Then setup the server to output the console to a serial port and use screen/minicom (Hyperterminal or putty in Windows) to console into the server over a serial cable. To set this up, you need to edit /etc/inittab to tell it to start a terminal on the serial port for the console. Configuring a serial console. You can configure the Linux console to a serial port by using the console parameter. For serial consoles, the console parameter takes the following form: console=hvsiX X is the device number, for example 0, 1, and 2. Choosing X=0 selects the first serial port. To install it, run as root: To connect to your machine using the serial console, use a command in the follow format: By default, if no option is specified, screen uses the standard 9600 baud rate. To set a higher baud rate, enter: $ screen /dev/consoleport 115200 Where consoleport is ttyS0, or ttyUSB0, and so on. How To Configure Minicom For Serial Console Connections by Gini Gangadharan Published March 28, 2018 Updated May 5, 2018 Those who work with infrastructure/server deployment knows how difficult it is to get a console for those devices having no display like switches, routers and a blade chassis/enclosure. 4 Execution result. GRUB to monitor display is as below. GRUB to serial console is as below. This article used 'sudo virsh console ' for connecting serial console. Login prompt to monitor display is as below. Tty1 is displayed with press Ctrl + Alt + F1. Login prompt to serial console is as below. A lot of those don't have a traditional console, like a monitor and keyboard. Instead, the console is often routed to the serial port. In order to take advantage of this, some post-install configuration is necessary. This howto can also be used to setup a serial console on an existing headless server as a backup for administering the machine.
Active3 months ago
I am trying to connect minicom to a serial device that is connected via a USB-to-serial adapter. This is a PL2303 and from everything I've read no additional drivers are required. The device is recognised as a PL2303.
I'm a beginner at minicom. Is this the correct command to execute? Or do I need to configure something?
Peter Mortensen14.5k1919 gold badges8989 silver badges118118 bronze badges
codingJoecodingJoe1,64688 gold badges3737 silver badges5656 bronze badges
10 Answers
First check with
dmesg | grep tty
if system recognize your adapter.Then try to run minicom with sudo minicom -s
, go to 'Serial port setup' and change the first line to /dev/ttyUSB0
. Linux Serial Console Setup Download
Don't forget to save config as default with 'Save setup as dfl'. It works for me on Ubuntu 11.04 on VirtualBox.
MatejMatej1,14411 gold badge1111 silver badges2424 bronze badges
You will need to set the permissions every time you plug the converter in.I use PuTTY to connect. In order to do so, I have created a little Bash script to sort out the permissions and launch PuTTY:
P.S. I would never recommend that permissions are set to 777.
Peter Mortensen14.5k1919 gold badges8989 silver badges118118 bronze badges
McPartyMcParty
The serial port communication programs
moserial
or gtkterm
provide an easy way to check connectivity and modify /dev/ttyUSB0
(or /dev/ttyUSB1
!) settings. Even though there maybe only a single USB to RS232 adapter, the n
designation /dev/ttyUSBn
can and does change periodically! Both moserial
and gtkterm
will show what port designation is relevant in their respective pull down menus when selecting an appropriate port
to use.Check out help.ubuntu.com/community/Minicom for details on
minicom
.EkimEkim
I had fix this with
adduser *username* dialout
. I never had this error again, even though previously the only way to get it to work was to reboot the PC or unplug and replug the usb to serial adapter.RomanRoman
Long time reader, first time helper ;)
I'm going through the same
hellish
experience here with a Prolific USB <> Serial adapter and so far Linux is the easiest to get it to work.On CentOS, I didn't need to install any drivers etc. That said,
dmesg | grep -i tty
ordmesg | grep -i usb
showed me /dev/ttyUSB0.screen ttyUSB0 9600
didn't do the trick for me like it did in OSX- minicom is new to me but it was complaining about lack of /dev/modem
However, this helped: https://www.centos.org/forums/viewtopic.php?t=21271
So install minicom (
yum install minicom
) then enter its settings (minicom -s
). Then select
Serial Port Setup
and change the Serial Device (Option A) to /dev/ttyUSB0, or whatever your device file is as it slightly differs per distro. Then change the Bps (Option E) to 9600 and the rest should be default (8N1 Y N)
Save as default, then simply
minicom
and Bob's your uncle.HTH.
Sam GreadlySam Greadly
I get get the same minicom error, 'cannot open /dev/ttyUSB0: No such file or directory'
Three notes:
- I get the error when the device attached to the serial port end of my Prolific Technology PL2303 USB/Serial adapter is turned off. After turning on the device (an embedded controller running Linux) minicom connected fine.
- I have to run as super user (i.e.
sudo minicom
) - Sometimes I have to unplug and plug back in the USB-to-serial adapter to get minicom to connect to it.
I am running Ubuntu 10.04 LTS (Lucid Lynx) under VMware (running on Windows 7). In this situation, make sure the device is attached to VM operating system by right clicking on the USB/Serial USB icon in the lower right of the VMware window and select Connect (Disconnect from Host).
Remember to press Ctrl + A to get minicom's prompt, and type X to exit the program. Just exiting the terminal session running minicom will leave the process running.
Peter Mortensen14.5k1919 gold badges8989 silver badges118118 bronze badges
user1271729
I had the exact same problem, and it was fixed by doing a
Peter Mortensenchmod 777 /dev/ttyUSB0
. I never had this error again, even though previously the only way to get it to work was to reboot the VM or unplug and replug the USB-to-serial adapter. I am running Ubuntu 10.04 (Lucid Lynx) VM on OS X.14.5k1919 gold badges8989 silver badges118118 bronze badges
Joshua EtienneJoshua Etienne
I suggest that newbies connect a PL2303 to Ubuntu, chmod 777 /dev/ttyUSB0 (file-permissions) and connect to a CuteCom serial terminal. The CuteCom UI is simple intuitive. If the PL2303 is continuously broadcasting data, then Cutecom will display data in hex format
gatorbackgatorback23911 gold badge44 silver badges2424 bronze badges
I just got my GUC232A cable with a molded-in PL2302 converter chip.
In addition to adding myself and br to group
dialout
, I found this helpful tip in the README.Debian file in /usr/share/doc/bottlerocket
:Linux Serial Console Boot
This package uses debconf to configure the /dev/firecracker symlink, should you need to change the symlink in the future run this command:
dpkg-reconfigure -pmedium bottlerocket
That will then prompt you for your new serial port and modify the symlink. This is required for proper use of bottlerocket.
I did that and voila! bottlerocket is able to communicate with my X-10devices.
Peter Mortensen14.5k1919 gold badges8989 silver badges118118 bronze badges
DexterIsMyHeroDexterIsMyHero
Linux Serial Console Setup Software
Putty on ubuntuThere is no need to install the driver for PL2303So only type the command to enable the puttySudo chmod 666 /dev/ttyUSB0DoneOpen the putty.
Nikhil ParasharNikhil Parashar