U232 P9 Driver Windows - 10

Important Warning:

Many counterfeit PL-2303 chips exist. Since Windows 8/10, Prolific has deliberately broken drivers for counterfeit chips. If your adapter is fake, the driver will install but show Error 10 (This device cannot start) or Code 28 .

Why Do I Need to Update the U232 P9 Driver?

  • Advanced Settings (Latency): In Device Manager → Port Settings → Advanced → Set Latency Timer to 1 ms (for real-time data logging) or 16 ms (default for stability).

    • Recommendation:

    If you see Error 10 after installing the latest Prolific driver, buy an FTDI-based USB-to-serial adapter. They cost $10–15 and save hours of frustration. u232 p9 driver windows 10

    1. [ ] Identify your chip (Prolific PL2303 vs Silicon Labs).
    2. [ ] If Prolific, try official v1.14.0 driver first.
    3. [ ] If Code 10 appears, switch to legacy v3.3.2.102.
    4. [ ] Disable Windows 10 driver signature enforcement if needed.
    5. [ ] Set a static COM port (e.g., COM4).
    6. [ ] Test with a loopback connector (short pins 2 and 3 of the DB9).

    PL2303HXD (Rev D) / PL2303TA / PL2303HXA

    Look for: driver – version v11.0.0 or newer. Important Warning: Many counterfeit PL-2303 chips exist