PL2303GR

USB to RS485 Bridge Controller

OVERVIEW

The PL2303GR is a low cost and high performance USB-to-RS485 Bridge Controller with built-in RS485 transceiver. The PL2303GR provides a convenient solution for connecting an RS-485 half-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. The PL2303GR highly compatible drivers could simulate the traditional COM port on most operating systems allowing the existing applications based on COM port to easily migrate and be made USB ready.

The PL2303GR integrates a high baud rate RS-485 transceiver that meets the EIA/TIA-485 communications interface specifications. The RS-485 transceiver build in TVS protection for bus terminals of ±15kv contact discharge and ±18kv air-gap discharge. It provides the bipolar output to the transmitters, and makes the transmitters to deliver the RS-485 output voltage levels. Under normal operation, PL2303GR operates at very low power consumption with guaranteed data rate up to 10Mbps.

FEATURE

  • Full Compliant with USB Specification v2.0 (Full-Speed)
  • On-chip USB 1.1 transceiver and 5V to 3.3V regulator
  • On-chip 96MHz Clock Generator
  • Built-in RS485 Transceiver
    • Follow EIA / TIA-485 standards
    • Full UART RS485 interface pins (A , B)
    • Flexible baud rate support up to 10Mbps
    • Software flow control
  • Supports OTPROM (One-Time Programmable ROM) for USB device descriptors. OTPROM can be programmed directly through USB port.
  • Each IC has unique ID (for Serial Number)
  • 1024-byte bi-directional data buffers (768-byte receive / 256-byte transmit).

PACKAGE

  • SSOP28

Technical Support

Product Brochure

DescriptionVersionUpdated
DownloadPL2303GR product brochure20200520

Datasheets & Notice

DescriptionVersionUpdated
DownloadPL2303GR USB to RS-485 Bridge Controller DatasheetV1.02021/03/15

Drivers & Software

DescriptionVersionUpdated
DownloadWindows Driver Installer Setup Program ( Win7 / Win8.1 / Win10 / Win11)
Installer version & Build date: 4.5.0.0 (2025-08-08)

Windows 11 ( 64-bit ) WDF WHQL Driver: v3.9.6.0 (11/27/2024) / v5.2.9.0 (07/25/2025)

(For PL2303 HXD, SA, RA GC, GS, GT, GL, GE , GD, GR versions)
– Windows 11 Certified WHQL Driver ( 24H2 versions)
– Auto-download driver via Windows Update (Windows 11)

Windows 7/8.1/10 (32 & 64-bit) WDF WHQL Driver: v3.8.43.0 (05/29/2024) / v5.1.9.0 (07/23/2025)

(For PL2303 HXD, SA, RA, GC, GS, GT, GL, GE , GD, GR versions)
– Windows 10 Certified WHQL Driver (TH1 1507, TH2 1511, RS1 1607, RS2 1703, RS3 1709, RS4 1803,RS5 1809,19H1 1903, 19H2 1909, 20H1 VB, 21H1, 22H1versions)
– Windows 7, 8.1 Certified WHQL Driver
– Compatible with Windows Server 2008, 2008R2, 2012, 2012R2, 2016, 2019 , 2022
– Auto-download driver via Windows Update (Windows 7, 8.1, 10)

– Installer Language Support: English (default),

– For Prolific USB VID_067B&PID_2303, PID_2304, PID_23A3, PID_23B3, PID_23C3,PID_23D3,PID_23E3,PID_23F3,PID_2323.
– Includes Certification Report, User Manual, Driver Release Notes, CheckChipVersion Tool
– Installer supports silent install (add “/s” parameter when running program)

v4.5.0.02025/08/08
DownloadWindows DCHU+DFx+Modem Standy Driver INF Setup ( Win10 / Win11)

Windows 11 ( 64-bit ) WDF WHQL Driver: v5.2.8.2 (12/12/2024)

Windows 10 ( 32 / 64 bit ) WDF WHQL Driver: v5.1.8.2 (12/11/2024)

(For PL2303 GC, GS, GT, GL, GE , GD, GR versions)
– Windows 11 Certified WHQL Driver ( 24H2 versions)

– Windows 11 Certified WHQL Driver ( 21H2 versions)

– Windows 10 Certified WHQL Driver ( 2004 versions)

– Windows 10 Certified WHQL Driver ( 1903 versions)

– Windows 10 Certified WHQL Driver ( 1809 versions)
– Auto-download driver via Windows Update (Windows 11)

DCHU: https://learn.microsoft.com/en-us/windows-hardware/drivers/develop/dch-example

Directed PoFx (DFx): https://learn.microsoft.com/en-us/windows-hardware/drivers/kernel/introduction-to-the-directed-power-management-framework

Modem Standy: https://learn.microsoft.com/en-us/windows-hardware/design/device-experiences/modern-standby

v1.0.0.02025/05/13
DownloadWindows ARM64 Driver Installer Setup Program ( Win10 / Win11)
Installer version & Build date: 6.1.0.0 (2024-08-28)

Windows 10 / 11 ( ARM64-bit ) WDF WHQL Driver: v5.3.7.0 (06/27/2024)

(For PL2303 GC, GS, GT, GL, GE , GD, GR versions)
– Windows 11 Certified WHQL Driver ( 24H2 versions)
– Auto-download driver via Windows Update (Windows 11)

– Installer Language Support: English (default),

– For Prolific USB VID_067B&PID_23A3, PID_23B3, PID_23C3,PID_23D3,PID_23E3,PID_23F3,PID_2323.
– Includes Certification Report, User Manual, Driver Release Notes
– Installer supports silent install (add “/s” parameter when running program)

v5.3.7.02024/09/06
DownloadPL2303G 16-GPIO LED Indicator Application Note
Includes GPIO Test Sample Program and Source Code		v1.0.0.32023/09/21
DownloadPL2303G WinCE 7.0 Driver for ARMv1.0.0.02023/07/26
DownloadMac OS X Universal Binary Driver v2.2.5 (PKG file format)

For Mac OS Sequoia (version 15)
For Mac OS Sonoma (version 14)
For Mac OS Ventura (version 13)
For Mac OS Monterey (version 12.4)
For Mac OS Big Sur (version 11) – see NOTE#1 below
For Mac OS Catalina (version 10.15) .
For Mac OS Mojave (version 10.14)
For Mac OS High Sierra (version 10.13)
For Mac OS X Sierra (version 10.12)
For Mac OS X El Capitan (version 10.11)
For Mac OS X Yosemite (version 10.10)
For Mac OS X Mavericks (version 10.9)
For PL2303 H/HX/HXD/EA/RA/SA/TA/TB chip versions
For Prolific USB VID_067B&PID_2303 Only
For PL2303GC, GS, GT, GL, GE , GD, GR chip versions
Includes Driver Installation Manual
NOTE#1: Mac OS High Sierra 10.13 introduces a new feature that requires user approval before loading new third-party kernel extensions. Go to System Preferences – Security & Privacy and click Allow.

https://developer.apple.com/library/content/technotes/tn2459/_index.html

NOTE#2: User can download PL2303 driver on Mac APP store. https://apps.apple.com/tw/app/pl2303-serial/id1624835354?l=en&mt=12

v2.2.112025/03/14
DownloadPL2303G Android USB Host API SDK v1.0.0.10

Requirements:
———————
– USB Device with PL2303GC, PL2303GS, PL2303GT, PL2303GL, PL2303GE, PL2303GR, PL2303GD, PL2303GT-2AB controller chip
– Android-Powered Device (Tablet/Phones) with USB Host Mode Support
– Android 3.2 and above OS versions

SDK Package includes following:
———————————————————–
1. PL2303 Sample Test Android App Software
– Single port (PL2303GSimpleTest.apk)
– GPIO A Control (PL2303G_GPIO_A_Test.apk)
– GPIO B Control (PL2303G_GPIO_B_Test.apk)
– Multi-port (PL2303G_MultiSimpleTest.apk)
2. PL2303G Android Demo Apps User’s Manual
3. PL2303G Android Sample App Source Code
4. PL2303G Android Java Driver Library
5. PL2303G Android App Development Reference Documents

User can download PL2303G app on Google Play.
https://play.google.com/store/apps/dev?id=5801101758672272902

v1.0.0.102025/09/04
Download
Linux Kernel 5.5 and above already includes built-in drivers for PL2303G Chip.

If you’s Linux kernel is v2.6.15 ~v5.4, Please update the PL2303G Linux driver via PL2303G_Linux_Driver_v1.0.7.zip

v1.0.72023/10/02

Reference Design Guide

DescriptionVersionUpdated
DownloadPL2303GR-SSOP28 Reference Schematic DesignV102020/07/30
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Application Note & User Manual

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Test Reports

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MP Tools (For Vendors Only)

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Firmware (For Vendors Only)

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Prolific Internal Only

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Software

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