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Before you begin, download the latest CP210x driver from the official Silicon Labs website or locate the driver on the CD that came with your CipherLab equipment.
Whether you are running a warehouse, a retail checkout lane, or an industrial lab, mastering this small but critical piece of software will save you hours of frustration. The CipherLab 308, paired with the right driver, remains a top-tier solution for serial-to-USB conversion.
Plug the USB end of the CipherLab 308 converter into a native USB port on your PC. cipherlab 308 usbtors232 interface converter driver top
Supports standard speeds from 75 bps to 128,000 bps.
If you cannot access Prolific’s official page, these are trusted secondary sources: Before you begin, download the latest CP210x driver
What are you running? (e.g., Windows 10, Windows 11)
Right-click the device in Device Manager, select Uninstall Device , check the box to delete the driver software, restart the PC, and run the installer again before plugging the device back in. COM Port Numbers Keep Changing Plug the USB end of the CipherLab 308
The official v1.00 driver was released in March 2005, primarily supporting Windows 98se and XP. The Vista Hurdle (2007):
If the driver is not working, or if the terminal is not communicating with the computer, try these solutions:
If your software requires a specific COM port (e.g., COM1) but the converter is assigned to COM10, you can change it:
The "Top" search result hadn't been a link on a webpage. It had been the top button on the reset switch, hidden in plain sight. The old tech had saved them, just like it had done for twenty years.