1. PL2303 USB-to-Serial Driver. Drivers for Operating System(s) Windows 10 64bit. Windows 8.1 64bit. Windows 8.1 32bit. Windows 8 64bit. Windows 8 32bit.
2. Download the USB - 1x serial port driver below - save it to your computer, do not click run. Locate the download (usually in a Download folder) then unzip USBserialwin.zip. Open Device Manager - locate the adapter - double click it - select Install driver from disk and when prompted, select the correct driver for your Operating System.

Download USB to Serial Converter for Windows to uSB driver. Join or Sign In. Sign in to add and modify your software. Sign in with Facebook Sign in with email. By joining Download.com.

Windows 7 64-bit & 32-bit, Windows Vista 64-bit & 32-bit, Windows XP, Windows 2000, Windows Me, Windows 98

Important note regarding Windows 7 and Vista:
The driver MUST be installed 'as Administrator'
Right-click the downloaded EXE file and choose Run as administrator

Download the Windows installer for the USB RS-232 adaptor:
Download for Windows 7/Vista/XP (32-bit)
Download for Windows 7/Vista (32-bit and 64-bit)

If for some reason the above driver does not work, try one of the following:
Download for Windows 7/Vista/XP (32-bit and 64-bit - Alternate driver)
Download for Windows XP, 2000, 98/ME (32-bit only)

For older cables (purchased prior to October, 2010):
Download for Windows 7/Vista/XP (32-bit and 64-bit)
Download for Windows Vista (32-bit only)

Run the installer, then after rebooting, plug the USB end of the adapter into one of the USB ports on the computer.

NOTE: For Windows 7, please use RC build 7100 or RTM Final version. (Installer program will not run on early Windows 7 or Beta versions)

Check the software driver installation

1) Open the Device Manager dialog from Control Panel

• Windows Vista: Start >> Control Panel >> System >> Hardware >> Device Manager
• Windows XP: Start >> Control Panel >> System >> Hardware >> Device Manager
• Windows 2000: Start >> Settings >> Control Panel >> System >> Hardware >> Device Manager
• Windows 98/ME: Start >> Settings >> Control Panel >> System >> Device Manager
  

2) Click the plus sign (+) next to 'Ports'.

3) If the device is properly installed, 'Serialio.com USB Serial Port' or 'Prolific USB-to-Serial COM Port' will be displayed.

The software driver is properly installed, but the USB-RS232 adaptor does not work as expected

One of the common reasons that software may not work as expected with a USB-Serial adaptor when the devcie is properly installed, is many older programs (and even some new ones) only support a limited number of COM ports (e.g. only COM1 - COM4)

If the USB-RS232 adapter is installed as COM5, it may need to be reassigned to COM1 - COM4 to work with some software.

The following outlines how to to reassign the COM port on Windows XP/2K/Me/98SE

Windows XP

Ftdi Usb Serial Converter Drivers 2.10.0.0

1) Follow steps 1-3 of 'Check the software driver installation'above.

2) Right-click on the 'Prolific USB to Serial Port', then click Properties

3) Click on the 'Port Settings' tab. Click the 'Advanced' button.

4) In the 'COM Port Number' drop-down select the desired port number. For example if the software requires COM2, select COM2. Note the COM port must have '(in use)' listed next to it, if it does then another device with that name is already installed in the system. After selecting the desire port number, click 'OK.'

5) Click 'OK' again, and the device will show up as being on the same COM port that it was before (i.e., COM5), but should show up on the selected port name when the Device Manager dialog is closed and opened again.

6) Close the Device Manager. Launch the software to use with the new COM port.

Windows 2000, Me, and 98 SE (Second Edition)

1) Follow steps 1 2 of 'Check the software driver installation'above.

2) Right-click on the 'Prolific USB to Serial Port', then click Properties.

3) Click on the 'Port Settings' tab. Click the 'Advanced' button.

4) Uncheck 'Use automatic settings'.

5) Select 'Input/Output range'. Click on 'Change Settings'.

6) Type '02E8-02EF' in the Value box. This value will change the port to COM 4. If COM 4 is in use, you must choose another port. The values for each port are.

• COM 1: 03F8-03FF
• COM 2: 02F8-02FF
• COM 3: 03E8-03EF
• COM 4: 02E8-02EF

7) Enter the value, then click OK. Click OK again, then click Yes when the 'Creating a Forced Configuration' window appears. Click OK.

8) Restart the computer. The Device Manager can be checked, to see the COM port change.

Note: Adaptor may not be exactly as pictured above.
back

USB to Serial converter HL-340: download 32 and 64 bit windows drivers (PID/VID 4348:5523)

Due to some reasons I had to run Windows XP on Virtualbox. After connected my classic pretty blue usb/serial cable converter, I found out that, as usual, Windows couldn’t recognize it. I wasted lot of time to find the appropriate working driver.

Driver Usb Serial Converter Download

The converter is identified as

ID 4348:5523 WinChipHead USB->RS 232 adapter with Prolifec PL 2303 chipset

Factory website: http://wch-ic.com/

Chip page: http://wch-ic.com/product/usb/ch340.asp

I don’t have the time to investigate because lsusb reports that it mounts the chip PL2303 while Windows XP identifies it as USB-SERIAL CH340, but I guess this is due for some “cloning” reasons.
Anyway here are the most updated windows drivers I could find:

32 bit: ch341_hl-340_windows_drivers_32bit

64 bit: usb_serial_converter_ch340_windows_x64_drivers

Hope it helps.