I am a little bit confused about reading and writing to a serial port. I have a USB device in Linux that uses the FTDI USB serial device converter driver. When I plug it in, it creates: /dev/ttyUSB1.
Active2 months ago
Setting up a Serial Terminal. Setting up a Serial Terminal with Linux. Setting up a Serial Terminal with Mac. OS X. Setting up a Serial Terminal with Windows. Common commands for the Intel® Edison board; Connecting to a Network. Connecting your Board Using Wi-Fi. Connecting to your Board Using Ethernet over USB; Note on Program-Erase (P/E. While the single boot floppy versions of Linux ('Serial Terminal Linux' was for just this purpose) that had minicom seem to have disappeared, you can still get Feather Linux - a bootable image for CD or USB thumb drive. However, if you're able to boot a CD, you might as well just get a recent distribution's LiveCD with minicom. Welcome to CuteCom. CuteCom is a graphical serial terminal, like minicom (or Hyperterminal on Windows, but I don't want to compare CuteCom to it, since Hyperterminal is really one of the worst applications I know). Currently it runs on Linux, FreeBSD and Mac OS X. The terminal is the beating heart of Linux, no matter how hard today’s user-friendly graphical distros might try to push it into the background. If you need something done quickly.
Serial Connection Emulator v.1.0.1 ttypatch is a Linux application that permits two or more 'serial port user programs' to reliably connect to each other without the use of actual serial ports. Also acts as a virtual patch panel among any number of real and virtual serial.
I thought itd be simple to open and read/write from it in C. I know the baud rate and parity information, but it seems like there is no standard for this?
Am I missing something, or can someone point me in the right direction?
jww
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gnychisgnychis
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2 Answers
I wrote this a long time ago (from years 1985-1992, with just a few tweaks since then), and just copy and paste the bits needed into each project.
The values for speed are
B115200 , B230400 , B9600 , B19200 , B38400 , B57600 , B1200 , B2400 , B4800 , etc. The values for parity are 0 (meaning no parity), PARENB|PARODD (enable parity and use odd), PARENB (enable parity and use even), PARENB|PARODD|CMSPAR (mark parity), and PARENB|CMSPAR (space parity).
'Blocking' sets whether a
read() on the port waits for the specified number of characters to arrive. Setting no blocking means that a read() returns however many characters are available without waiting for more, up to the buffer limit.
Addendum:
CMSPAR is needed only for choosing mark and space parity, which is uncommon. For most applications, it can be omitted. My header file /usr/include/bits/termios.h enables definition of CMSPAR only if the preprocessor symbol __USE_MISC is defined. That definition occurs (in features.h ) with
The introductory comments of Gabriel Staples
<features.h> says:
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wallykwallyk
Serial Terminal Emulator Windows 10
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For demo code that conforms to POSIX standard as described in Setting Terminal Modes Properlyand Serial Programming Guide for POSIX Operating Systems, the following is offered.
It's essentially derived from the other answer, but inaccurate and misleading comments have been corrected.
To make the program treat the received data as ASCII codes, compile the program with the symbol DISPLAY_STRING, e.g.
If the received data is ASCII text (rather than binary data) and you want to read it as lines terminated by the newline character, then see this answer for a sample program.
sawdustsawdust
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protected by user405725 Jan 24 '13 at 20:53
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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 Mortensen
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codingJoecodingJoe
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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 .
Don't forget to save config as default with 'Save setup as dfl'. It works for me on Ubuntu 11.04 on VirtualBox.
MatejMatej
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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 Mortensen
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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,
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.
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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 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 Mortensen
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MaxMax
I had the exact same problem, and it was fixed by doing a Peter Mortensen
chmod 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.
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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
gatorbackgatorback
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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 :
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 Mortensen
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DexterIsMyHeroDexterIsMyHero
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
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