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How to use Serial Port from WSL using minicom

Nov 14, 2021 windows-wsl serial-port ubuntu

The COM port number enumerated from Windows is needed in WSL

From Windows Device Manager

Check for “USB Serial Port” under Ports (COM & LTP)

> Ports (COM & LTP)
  - USB Serial Port (COM9)

From Windows Powershell

Open Windows Powershell and find the connected Serial port COM number.

This is using the windows hardware class guid: {4d36e978-e325-11ce-bfc1-08002be10318}.

The full list of ClassGuids is available [here]

> $lptAndCom = '{4d36e978-e325-11ce-bfc1-08002be10318}'
> get-wmiobject -Class win32_pnpentity | where ClassGuid -eq $lptAndCom | select name
USB Serial Port (COM9)

Access serial port from WSL

Add the current user to dialout group

adduser $(whoami) dialout

In our case, the tty corresponding to COM9 in WSL is /dev/ttyS9

Change permission of the tty node:

chmod +X /dev/ttyS9

Install minicom

sudo apt install minicom

Access serial port using minicom

minicom -D /dev/ttyS9

The default port and port settings can be changed in minicom using minicom -s

Please note the port number always changes in Windows when reconnected or connected together with other devices/usb ports. Check this on reconnection.