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This guide is for informational purposes. Always verify driver integrity via SHA-256 hashes from official sources. The author is not affiliated with Cadyce, Prolific, or WCH.
You are not alone. The Cadyce CA-US9 is a popular, budget-friendly adapter used by network engineers, hobbyists, and industrial technicians to connect legacy serial devices (RS-232) to modern computers without a COM port. However, like many generic USB-to-serial chips, it requires the correct driver to function properly. This 2,500+ word guide will walk you through everything—from identifying the chipset to downloading, installing, and troubleshooting your driver. --- Cadyce Ca-us9 Usb To Serial Converter Driver Download