USB to UART Converter is a very useful tool for Embedded Systems. If you haven’t one, please try to buy it. It will definitely boost development speed of projects which uses UART modules like interfacing GSM, GPS, Bluetooth, Wi-Fi … By using it we can easily study these modules by sending data directly from your PC and analyzing the received data in your computer display without programming a microcontroller. Here we will use PL2303, one of the most popular USB to UART Converter manufactured by Prolific Technology Inc. Installing Driver Before starting using UART, you need to install driver for PL2303. You can install driver in two ways. If your system is connected to internet, you can install driver using windows update otherwise you need to download the driver setup file and install it. First we will see, installing driver using windows update. With Internet Connection Verify that your internet connect is OK and plug in the PL2303 USB to UART Converter to you PC. Windows Update will automatically search for driver and install instantly if it is available. If the automatic update doesn’t work, go to Control Panel >> System and Security >> Device Manger After Plug in the Device – Device Manager After Plug in the Device – Device Manager Right Click on USB-Serial Controller >> Update Driver Update Driver Software Update Driver Software Select “Search Automatically for updated driver software”. Then the Windows will Search, Download and Install the driver. Without Internet Connection If your system has no internet connection, you can follow this method. But you still need to download driver setup files form some other computer which has internet connection. Download PL2303 Driver using a computer which has internet connection. Copy the file to your PC and Unzip it Downloaded Files Downloaded Files Install PL2303_Prolific_DriverInstaller_v1.8.0 by following the on screen instructions. After completing the installation, plugin the PL2303 USB to UART converter to your PC After Plug in the Device After Plug in the Device After completing the installation in any of the above methods, verify that the device is working fine and note the COM port number using the Device Manager.