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GlobalSat BU-353-S4 GPS receiver not locking coordinates in UCL software on Windows 11

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Anand Swaroop Tiwari
Author
Reply #60
Role
Sep 11, 2026
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Active Updated 1 month ago

A solid red light on the BU-353-S4 means power is on, but satellite fix has NOT been acquired.

The LED must be blinking red for a valid GPS 3D fix.

Troubleshooting steps:

  1. Move the antenna near an open window or terrace with a clear sky view. Thick concrete roofs block satellite signals.

  2. In Device Manager → Ports (COM & LPT):

    • Verify the COM port number (e.g., COM3)
    • Set Baud Rate to 4800 (mandatory for UCL)

  3. Windows 11 driver issue: Prolific PL2303 requires driver version 3.8.31.0 or older.

    • Newer drivers from Windows Update cause Error Code 10 (device cannot start).
    • Download the older driver from the Prolific official site.
Device Manager → Right-click COM port → Update driver
→ Browse my computer → Let me pick
→ Select v3.8.31.0

Revision History (1)

Newest first
Rev #1
Edited by Anand Swaroop Tiwari •
Author Edit
8:05 PM · 12 Sep 2026
Reason for edit: Corrected GPS baud rate setting to 4800 for Aadhaar UCL 3.3.4.2 on Windows 11
Previous Content
## Initial Draft A **solid red light** on the BU-353-S4 means power is on, but **satellite fix has NOT been acquired**. > The LED must be **blinking red** for a valid GPS 3D fi... > *Pending confirmation with NPCI / UIDAI / IRCTC guidelines — edit reason: Corrected GPS baud rate setting to 4800 for Aadhaar UCL 3.3.4.2 on Windows 11*
Revised Content
A **solid red light** on the BU-353-S4 means power is on, but **satellite fix has NOT been acquired**. > The LED must be **blinking red** for a valid GPS 3D fix. **Troubleshooting steps:** 1. **Move the antenna** near an open window or terrace with a clear sky view. Thick concrete roofs block satellite signals. 2. In `Device Manager → Ports (COM & LPT)`: - Verify the COM port number (e.g., COM3) - Set **Baud Rate to 4800** (mandatory for UCL) 3. **Windows 11 driver issue**: Prolific PL2303 requires driver version **3.8.31.0 or older**. - Newer drivers from Windows Update cause **Error Code 10** (device cannot start). - Download the older driver from the Prolific official site. ``` Device Manager → Right-click COM port → Update driver → Browse my computer → Let me pick → Select v3.8.31.0 ```
Fields updated: Content