Cipherlab 308 | Usb-to-rs232 Interface Converter Driver

A: Windows 10 has stricter driver signing and the Prolific clone blocker. Use the legacy driver (v3.3.2.2009) or replace the converter with an authentic unit.

If your PC does not automatically assign a COM port (seen in Device Manager as an unknown device or with a yellow exclamation), the issue is not a missing “CipherLab 308” driver — it’s a missing or corrupted driver for the .

The CipherLab 308 is a compact and efficient USB-to-RS232 interface converter that enables users to connect their computers to devices with RS232 serial interfaces, such as barcode scanners, printers, and industrial control systems. This converter is particularly useful in situations where legacy devices need to be integrated into modern computing environments.

This is critical: Many CipherLab 308 converters (especially those bought from third-party sellers on Amazon or eBay) use counterfeit Prolific PL-2303 chips. Prolific has actively sabotaged newer drivers for these clones.