In Recent, we received some inquiries from our customers. When they purchasing a new USB converter AR-321-CM to use in win10 or win11, the system remind that the driver version doesn’t support and should install corresponding driver; the customer think the product is defective and then send it back to SOYAL for repair. Since the USB chip of PL2303 we use upgrades, the different chip has the corresponding driver version. Please read the following comparison table and choose the correct driver for your product version.
Comparison Chart of Driver Versions of AR-321CM Chip and Operation System
| Manufacturing Date | Operation System | Chip Version | Driver Version |
After 2021/03 ~ | Win-11 | PL2303-GC | High Note: Please firstly uninstall old driver before installing new driver !!! |
| 2013/01 ~ 2021/03 | PL2303-HXD | ||
| 2008/03 ~ 2012/12 | Win-7 | PL2303-HX | PL23XX_Prolific_DriverInstaller_V260 |
| Note 1: Step by step uninstall old driver in Win11 | |
| Go to Control Panel → Device Manager | Important: required to unplug all of AR-321CM devices from computer’s USB Port in the first hand |
| Select Ports (COM & LPT) à select “USB-to-Serial Comm Port”, right click à select “Uninstall device” |
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| Tick the box of option “Delete the driver software for this device.” à select “Uninstall” | |
| Reinstall new USB Driver for Win11 | USB Driver version: PL23XX_Prolific_DriverInstaller_V300.exe and after |
- Tools for checking chip version：PL23XX_checkChipVersion_v1020.exe
- When auto-simulated USB COM port number is more than 20, it must change number less than 20 ; Moreover, the computer must be restarted after changing the number.