Cannot Open Serial Port /dev/ttyusb0 Error Permission Denied
Contents |
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of could not open port /dev/ttyusb0: [errno 13] permission denied: '/dev/ttyusb0' this site About Us Learn more about Stack Overflow the company Business cannot open /dev/ttys0 permission denied Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ cannot access /dev/ttyusb0' no such file or directory Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody
Minicom Cannot Open Dev Tty8 Permission Denied
can answer The best answers are voted up and rise to the top Serial port terminal > Cannot open /dev/ttyS0: Permission denied up vote 7 down vote favorite 3 I had Windows XP on this box and it failed. Thinking it was corrupted OS I tried to reinstall, and it failed. But then I tried to install Ubuntu, and I could not run it from cannot open /dev/ttyusb0 the USB or from the HD. Did the mem test and found out one of my 512MB sticks (had 2) failed. I removed the bad one and was able to install Ubuntu but it was sluggish. I was trying to quickly setup my packet radio for Hurricane Sandy. Downloaded the Serial Port Terminal and was able to get some use but the system kept locking up. So Installed Xubuntu next to it, planning on running out the next day to get RAM for the box. Put Xubuntu on and now I am getting the following error with serial port terminal.: Cannot open /dev/ttyS0: Permission denied I would like to be able to use serial port terminal, or equivalent with Xubuntu so I can use my kpc3 packet terminal, connect to the com port on the back of my computer. Any ideas? serial-port share|improve this question edited Aug 26 '13 at 3:33 Braiam 38.8k1693153 asked Oct 31 '12 at 18:03 Joe Reynolds 36112 add a comment| 3 Answers 3 active oldest votes up vote 15 down vote The tty devices belong to the "dialout" group, I suspect you are not a member o
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings /dev/ttyusb0 permission denied arduino and policies of this site About Us Learn more about Stack Overflow the
Ubuntu Serial Port Permission Denied
company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges
Can't Open Device /dev/ttyusb0 Permission Denied Arduino
Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody http://askubuntu.com/questions/210177/serial-port-terminal-cannot-open-dev-ttys0-permission-denied can ask a question Anybody can answer The best answers are voted up and rise to the top Permission denied when attempting to open ttyS# in GtkTerm up vote 1 down vote favorite I'm trying to open a serial port in GtkTerm (downloaded from Ubuntu Software Center), however I'm getting "Cannot open /dev/ttyS0: Permission denied" error. Ubuntu Version: 14.04 14.04 gtk share|improve this http://askubuntu.com/questions/646891/permission-denied-when-attempting-to-open-ttys-in-gtkterm question asked Jul 10 '15 at 17:34 jerryh91 1085 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted Add yourself to the dialout group. It has read/reite permission to that device: sudo usermod -a -G dialout
ValidatorToolboxDNS Lookup Toolhtdigest Generator Tool Onlinehtpasswd Generator Tool OnlineHTTP Headers Lookup ToolMD5 Encryption ToolOpen Port Check ToolSHA-1 Encryption ToolURL Encoding/Decoding ToolAbout MeContact MeSitemap Home › Linux › Fix serial port permission denied errors on LinuxFix serial port http://websistent.com/fix-serial-port-permission-denied-errors-linux/ permission denied errors on LinuxApril 8, 2013 Linux Jesin A 25 CommentsThe ancient serial port which is no longer found on the latest motherboards and even http://stackoverflow.com/questions/9839988/dev-ttys0-does-not-open-in-ubuntu-12-04-beta the not so latest laptops is still used for connecting to the console of networking devices, headless computers and a lot other applications. On computers permission denied which do not have built-in serial ports USB-to-Serial adapters can be used. Linux identifies inbuilt serial ports as /dev/ttyS0, /dev/ttyS1,….. /dev/ttySn and USB-to-Serial adapters as /dev/ttyUSB0, …. /dev/ttyUSBn and they can be accessed using terminal emulator applications like PuTTY, minicom and screen.Normally when the serial console is accessed using the terminal /dev/ttyusb0 permission denied emulator of your choice as a non-root user you'll get a "permission denied" error. Using PuTTY on Ubuntu I got the following error - "Unable to open connection to: Unable to open serial port". PuTTY on Linux throws this error if the user running it does not have permissions to access the serial port device fileThis is because the device file of the serial port does not have permissions to allow to currently logged in user to "read" or "write" to the serial device. The following command will confirm that.jesin@localhost:~$ ls -l /dev/ttyUSB* crw-rw---- 1 root dialout 188, 0 Apr 8 21:54 /dev/ttyUSB0 crw-rw---- 1 root dialout 188, 1 Apr 8 21:54 /dev/ttyUSB1So we can see that only the "root" user and the "dialout" group have proper permissions, while chmod can be used to grant access to the required user or everyone it is messy and not a secure way. The eas
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up /dev/ttyS0 does not open in ubuntu 12.04 beta up vote 1 down vote favorite 2 I'm on ubuntu 12.04 beta. I premit that minicom works properly on /dev/ttyS0 (but putty doesn't). I control the port in C code which works properly on ubuntu 11.10: fd = open(p_ttys_parms->device, O_RDWR | O_NOCTTY | O_NDELAY); if(fd < 0) { printf("ERROR: cannot open device %s\n", p_ttys_parms->device); return 0; } but in 12.04 beta I get fd < 0 and exit after the printf. Did anybody experience the same and succeeded somehow? ubuntu serial-port share|improve this question asked Mar 23 '12 at 13:25 giuspen 50411023 2 And what is in errno? That should be the first thing you look at. –paxdiablo Mar 23 '12 at 13:29 I get errno: Permission denied, running it again with sudo it works. You solved my problem thank you (even if I don't get the reason why in 12.04 I need sudo to open a serial port while in 11.10 it was not necessary). –giuspen Mar 23 '12 at 13:42 No probs, I'll copy that to an answer and add some more detail on the likely reason and fix. –paxdiablo Mar 23 '12 at 13:59 add a comment| 2 Answers 2 active oldest votes up vote 6 down vote accepted The first thing you should do is check the value of errno. The open call, if it returns -1, will set errno to a value indicating what the actual problem is. And, based on your comment that it's Permission denied and your program works when run under sudo, it's probably a permissions problem with the /dev/ttyS0 device file. I get a similar issue under Debian 6: pax> ls -al /dev/ttyS0 crw-rw---- 1 root dialout 4, 64 Mar 23 21:00 /dev/ttyS0 pax> echo xyzzy >/dev/ttyS0 bash: /dev/ttyS0: Permission denied You may find you need to add your user to the dialout group (or another group, depending on how far Ubuntu deviates from my beloved Debian) to be allowed access: pax> id -