Putty Fatal Error Unable To Open Serial Port
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Ubuntu Putty Unable To Open Serial Port
and even the not so latest laptops is still used for connecting to the console of networking devices, headless putty error unable to open connection to com3 computers and a lot other applications. On computers 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
Minicom: Cannot Open /dev/ttyusb0: Permission Denied
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 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 unable to open connection to com1 unable to open serial port 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 easier way is the add the user to the dialout group.First verify if the user does belong to the dialout group using the "id" command.jesin@localhost:~$ id -Gn jesin jesin adm cdrom sudo dip plugdev lpadmin sambashare kvmNext add the user to the "dialout" supplementary group.jesin@localhost:~$ sudo usermod -a -G dialout
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Unable To Open Serial Port Putty Windows 10
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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 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Close & re-open putty serial port up vote 0 down vote favorite Can I 'close' the serial port from putty? I have another C# program that only opens the port when it needs to do its business and promptly closes the port when it's done. I can therefore open up putty, start a session, and interact with the serial line, but I can't seem to figure out how get putty to close the port so I can go back to the first program. I could close putty, but then I lose the data in the window and have to re-open putty when I need it again, so that's not a good solution. I've found that I can force putty into an 'inactive' state by physically unplugging the USB-serial adapter I'm using - this causes a 'PuTTY Fatal Error: Error reading from serial device', which then puts the session into an 'inactive' state (title bar reads 'COM3 - PuTTY (inactive)') and adds a menu bar command to 'Restart Session'. I can plug the adapter back in and use it with the first program and then restart the putty session (with the aforementioned command) and continue the process. But obviously I'd like to be able to do this without physically unplugging the adapter... Any thoughts? session serial-port putty share|improve this question asked Aug 28 '13 at 18:26 johnny 1,9991526 Try reconfiguring putty to use a different serial port; that should close the current serial port and keep the session active. –sawdust Aug 28 '13 at 19:11 @sawdust, I tried that as well, but putty doesn't let you change the port once it's opened - the option disappears from the settings dialog. I even tried applying settings from another saved session that used a different port, and that didn't change the port either. Good thought, though. –johnny Aug 28 '13 at 20:49 1 Consider using a different terminal emulator program that would let you change the serial port connection. Minicom (for Linux), TeraTerm and even Hyperterminal (although very awkward) can do this on the fly. –sawdust Au