[SOLVED] USB to Serial

Quick to answer questions about finding your way around Linux Mint as a new user.
Forum rules
There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section.
Before you post please read how to get help
Locked
2sticks
Level 1
Level 1
Posts: 1
Joined: Tue Jun 04, 2013 6:07 am

[SOLVED] USB to Serial

Post by 2sticks »

Hi guys,

I hope this post will help anyone out there as I too needed help with this, so after searching the web for the best part of last night i have decided to sign up and post what i leant on here in one place.

The drivers are already installed so dont worry about those but you can check using these commands:

Code: Select all

   dmegs   

will print the following to your screen with the converter/cable attached

Code: Select all

[  381.259373] ch341 2-5:1.0: device disconnected
[ 1079.740020] usb 2-5: new full-speed USB device number 4 using ohci_hcd
[ 1079.949788] usb 2-5: New USB device found, idVendor=1a86, idProduct=7523
[ 1079.949793] usb 2-5: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 1079.949797] usb 2-5: Product: USB2.0-Ser!
[ 1079.952834] ch341 2-5:1.0: ch341-uart converter detected
[ 1079.988849] usb 2-5: ch341-uart converter now attached to ttyUSB0 ----------> this is the part you want to see as this is the port your be using in puTty or any other communication console
with the converter disconnected use the following command "lsusb"

Code: Select all

user@mint-host ~ $ lsusb
Bus 001 Device 003: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 002 Device 002: ID 062a:0208 Creative Labs 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
now attached the cable again and re-run the same command

Code: Select all

user@mint-host ~ $ lsusb
Bus 001 Device 003: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 002 Device 002: ID 062a:0208 Creative Labs 
Bus 002 Device 005: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter -------------> new line added
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Notice the new line added? this is your device. So everything seems to work. expect you wont be able to connect (I’m using cisco router/switch via the console port) go a head and try yourself then come back.

So now if you have tested and it doesn't work you can try a quick and dirty trick (this will only work if the converter/cable is connected and will remain working as long as you do not unplug it.. if you do plug it back in and re-enter the code below

Code: Select all

sudo chmod 777 /dev/ttyUSB0
(make sure you enter the correct number but mostly for what I have seen is ttyUSB0. 0 is a zero)
Now if you had entered the code everything should be working, if it isn't and you checked you entered the code correctly then you need more help.

So we have so far, checked to see if the drivers are installed and working, the device is seen and we can connect. So lets fix it so you do not have to change the permission every time you re-boot. or unplug the cable. To do so enter the code below, re-boot and happy days all is good

Code: Select all

sudo adduser (your user name e.g USER in my case) dialout
I hope this will help anyone like me who was unaware permissions needed to be changed to communicate via a usb to serial interface
depdesu
Level 1
Level 1
Posts: 1
Joined: Wed Sep 18, 2013 8:21 pm

Re: [SOLVED] USB to Serial

Post by depdesu »

Registered to thank you. I really appreciate you taking the time to write this guide.
User avatar
kukamuumuka
Level 16
Level 16
Posts: 6749
Joined: Tue Sep 03, 2013 4:51 am
Location: Finland
Contact:

Re: [SOLVED] USB to Serial

Post by kukamuumuka »

A good HowTo for HowTo .. :wink:
http://forums.linuxmint.com/viewforum.php?f=42
Locked