Serial Port Permissions Windows 7
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Jul 20, 2009. First, make sure the serial port exists. If you work on a program that opens the port and forget to close it, or if an error occurs and the program terminates without closing the port, this is the message you will get the next time. This will allow for split permissions and controlled single access to the COM port. Apr 18, 2015. There can be several reasons as highlighted in these questions: They include: port is already in use by another application; permissions are set to.
Serial Port Permissions Windows 7
I am new to programming and am trying to communicate with my arduino using python through serial communication. I am using the following code:
Arduino code:
Python code:
I get the following error on running the python script:
serial.serialutil.SerialException: could not open port 'COM3': PermissionError(13, 'Access is denied.', None, 5)
jfpoilpret4 Answers
More than likely you ran the Arduino program from the Arduino IDE, and left the terminal window open. You must close it before you run the python program, as it will already 'own' the port until it closes. You dont have to quit Arduino IDE, just close the terminal window.
There can be several reasons as highlighted in these questions:
They include:
- port is already in use by another application
- permissions are set to deny access to normal users
- problems in the code (top answer in first link)
Try to run with administrator priviledges ('run as administrator'). Others claim that a simple retry might help.
Either run your python program in 'administrator mode' or close any other programs using the port intended for
Are you by any chance using Jupyter Notebok? I was having a similar error today and managed to solve it by opening Jupyter Notebook through Anaconda Navigator instead of opening it through Anaconda Prompt.