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Dec 16, 2020 • Filed to: USB Recovery • Proven solutions

Have you ever had difficulty connecting your devices to your computer using a Prolific USB to Serial adapter? If yes you are lucky to find this page, it will give you all the information need to fix an unresponsive Serial driver adapter. You may have noticed a yellow exclamation mark hovering over or beside the USB to Serial Driver when searching your Device Manager and if you have we can all agree that it signifies a prevailing problem.

Connect RS232 device into any USB port on your laptop/computer. Allow 20+- seconds for Windows to attempt to install drivers automatically. If it's successful, skip to Step 2 below. However in 95% of cases, it will fail to automatically install the drivers. So you have to install drivers manually.

Overview of the Error

Install Pyserial. Before installing Pyserial, we need to get pip: sudo apt install python-pip. Now we can go on to install Pyserial: python -m pip install pyserial Test installation and read console. To read our console, we need to connect the Raspberry Pi USB port to Arduino one. For testing purposes, I'll show you results from my weather system. To manually install the USB to Serial drivers on Windows 7 64-bit operating systems Open Windows Control Panel. Select System Hardware Device Manager. The Device Manager window appears. USB RS232 - FTDI designs and supplies USB semiconductor devices with Legacy support including royalty-free drivers. Application areas include USB RS232, ( USB Serial ), USB Parallel, USB Docking Stations, and upgrades of Legacy designs to USB. The package provides the installation files for FTDI USB Serial Port Driver version 2.12.26. If the driver is already installed on your system, updating (overwrite-installing) may fix various issues, add new functions, or just upgrade to the available version.

If you are not able to connect your device to your PC using a USB to Serial adapter it may be that

The USB driver is outdated
The USB Driver is missing
Or even a corrupted driver

While you can't be so sure what the exact problem is there are solutions you can adopt to fix the issue once and for all. Read on to find quick fixes to resolve the problem.

1# Fix Prolific USB to Serial Driver not Working

Solution: Roll your Prolific USB to Serial Driver back to an older version

Updating your drivers often work wonders for your system because it makes sure that it runs on the latest features that guarantee maximum functionality. Unfortunately updating your drivers can cause this kind of error especially if your latest update does not work too well with your hardware. Once you upgrade your PC to the latest Windows version your Prolific USB to Serial Driver also updates to the latest driver software and if the driver is not compatible with your Hardware issues may arise. To correct the error, you will have to download the driver again by following these steps.

Right-click on your PC Start button and open Device Manager

Double click LPT and COM ports then locate the Prolific USB to Serial Driver and right-click it so you can select Update Driver

For driver software click My computer

From My computer select 'Let me pick from a list of drivers available'

Choose an older version from the list then click Next

The driver you selected will be installed automatically
Once it has been downloaded reconnect the driver to see if it works.

2# Fix Prolific USB to Serial Driver 'Coder 10'

Driver issues reveal themselves in so many ways or through messages such as

This device will not start (Code 10)
There is no driver installed in this device
The driver was not successfully installed

A code 10 error may arise because the chip you are using is not an original one. If you are using a fake, the manufacturer has a way of disabling it due to copy write infringement and the copy write takes effect once you download a recent update. To protect your PC from getting this code, you will have to make sure that your Windows 10 never updates a driver without approval. Updates come in the form of 64 bit and 32-bit drivers. Below we will show you how to work your way around the problem.

Window 64 bit Fix

To fix Windows 64 bit OS including Prolific USB to Serial Adapter, follow through these steps.

Download 'PL2303_64bit_Installer.exe and Save
Remove every USB to Serial adapter from your PC and double click the 'PL2303_64bit_installer.exe
Follow the prompt by plugging in one USB to Serial adapter the click on Continue
Reboot your PC to get Windows up and running

If you have followed these process through and you still see the same error go to your device manager

Open the control panel and navigate to Device Manager
From your control panel navigate to the System category and click the Hardware tab
Scroll to the LPT/COM port and double click Prolific USB to Serial Comm Port
Click Drivers in the Properties section
The Driver you choose should read '3.3.2.102 with an appropriate date attached
If the date is wrong then it means the wrong driver was installed
Unplug the Serial adapter and run the steps again to install the correct driver

Window 32-bit

For Windows 32-bit OS systems follow these steps

You will have to download the 'PL-2303_Driver_Installer.exe and save from Microsoft download link
Run the program and eradicate the driver if you can
Run the installer once more to install a correct driver

To Troubleshoot for error if your device still does not work

Go to Control panel, enter System to access your Device Manager
Scroll down to the LPT/ COM port then double click Prolific USB to Serial Comm Port
Click Driver in the Windows Properties section
The driver must be numbered as '2.0.2.8' and dates accordingly

If the driver was not installed, remove the Serial adapter then run 'PL2303_Driver_Installer.exe' again. Follow directions in Device Manager to download the correct driver

The three solutions listed in this article have proven to be quite helpful in fixing a Prolific USB to Serial driver not working on Windows 10. They may appear confusing at first but if you follow each step in detail you can resolve the issue.

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FTDI Driver Installation

Development boards such as the SparkFun RedBoard for Arduino and the Arduino Uno require special drivers or code that tells the computer how to interact with them. This guide is here to help you get this driver software installed as quickly as possible so you can get back to building circuits and learning about electronics!

These instructions apply to both the Arduino Uno, the Arduino Uno SMD, and the SparkFun RedBoard for Arduino.

Note: You should only have to complete this process one time. Once the correct drivers are installed, your board will be recognized by your computer every time you plug it in afterwards.

Note for Educators: You will most likely need to obtain administrative privileges from your network or IT administrator in order to install these drivers.

Scroll down to the corresponding section for whichever operating system (OS) you are using.

Windows

Plug the board into your computer. Windows will likely complain about the device not having the correct driver. It may attempt to find it. If you have never plugged in a similar device to your computer, it probably won't find a driver to use. Luckily, when you downloaded the Arduino IDE, it also came with all the necessary drivers.

To install the correct driver, open the Device Manger. This can be found be searching for 'device manager' in the start menu. Once Device Manager is open, you should see a device with a tiny yellow triangle and exclamation mark next to it.

If you plugged in a SparkFun RedBoard, it will look like the image on the left. Plugging in an Arduino Uno will result in the image on the right.

Right-click on the unknown device, and select

Install Usb Serial Port