Ubuntu Serial Terminal
Jan 19, 2015 how to use USB - serial adapter with Ubuntu 14.04. How to create a 3D Terrain with Google Maps and height maps in Photoshop - 3D Map Generator Terrain. You can configure the system to allow logins from a terminal over a serial port by seting up a getty(1) session on the serial port - getty is the tool for setting up a terminal and allowing logins onto it. Put an entry in your inittab(5) file to run it on the appropriate serial port on a respawn basis. My dell dimension 8400 has a serial port on the back. I want to use minicom to interface the serial port on this computer with Ubuntu installed. The output of dmesg grep tty did not give me much useful information however. I could not find anything with the key word 'Serial'. PuTTY is a popular terminal emulator for Windows, but it is not only limited to Windows operating system. Being free and open source, it is popular among Linux users too. PuTTY supports a wide range of protocols such as serial, SSH, Telnet, rlogin, SCP, SFTP etc. PuTTY is used by seasoned sysadmins and hobbyists/maker-crowd alike. Ubuntu has a number of terminal emulators that you can use, including xterm and the gnome terminal. If you install the kubuntu desktop package you can also use konsole under ubuntu. Setting the default terminal emulator is easy by using the update-alternatives command. The serial connection is being made at 115200 baud 8n1, on first serial port, called /dev/ttyS0 in linux (9600 8n1 is the default fall back if your hardware does not support 115200 baud) You are comfortable editing critical system files such as /etc/inittab, /boot/grub/menu.lst You are using a serial (null modem) cable.
The Question:
I plugged in a device (i.e. GSM modem) through a serial port (a.k.a. RS-232), and I need to see with which file in /dev/ filesystem this device was tied up, to be able to communicate with it. Unfortunately there is no newly created file in /dev/ nor can be seen anything in dmesg output. So this seems to be a hard question.
Background:
I had never worked with a serial device, so yesterday, when there appeared a need, I tried to Google it but couldn't find anything helpful. I spent a few hours in seek, and I want to share a found answer as it could be helpful for someone.
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Hi-AngelHi-Angel1 Answer
Unfortunately serial ports are non-PlugNPlay, so kernel doesn't know which device was plugged in. After reading a HowTo tutorial I've got the working idea.
The /dev/ directory of unix like OSes contains files named as ttySn(with n being a number). Most of them doesn't correspond to existing devices. To find which ones do, issue a command:
Ubuntu Serial Terminal Client
Above is an example output of my PC. You can see the initialization of a few serial ports:
ttyS0, ttyS1, ttyS4, ttyS5.
One of them is going to have a positive voltage upon a device plugged in. So by comparing the content of the file /proc/tty/driver/serial with and without the device plugged in we can easily find the ttyS related to our device. So, now do:
(un)plug a device
Next check the difference between the two files. Below is an output of my PC:
By comparing the three numbers with the dmesg output we can determine which one is the port:
Hence, our device is /dev/ttyS0, mission accomplished!