Anyone have any luck getting these to work with with Windows 11? Neither of mine work. I get an error in device manager that says to contact supplier

The messed up part is with a little help from Google there is a work around for the PL-2303A chipset with Win 11. AFAIK there is absolutely no reason why Win 11 would work with this chipset. Prolific must have supplied the pseudo driver (the one that lists the error) to Microsoft for use w/ Win 11. Planned obsolescence, BS! I would boycott any product with a Prolific chipset just to put it to them as they try to rip-off consumers. If you already have one, the procedure requires you to delete the nonsense the junk Prolific supplied Microsoft for Win 11 and load the Win 10 driver. I have tried and tested this and it works. DON'T BUY THIS PRODUCT FOR WINDOWS 11 SYSTEMS, native driver will not work and none will be officially available as Prolific has EOL this product in 2019.

Does this operate at rs232 levels or does it only convert to 5v logic levels?

This cable is rs232 signal level. Amazon does sell a similar cable (same chip set) that supports ttl level signal. The other cable has flying leads for your application

Why does that cross-section of the cable show so many wires? shouldn't there be only four lines for usb?

The wires that are shown are for the serial end of the cable. They are shown in groups with 3 tinned copper conductor. the wire groups each go to their connection on the serial end.

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BENFEI USB to Serial Adapter, Benfei USB to RS-232 Male (9-pin) DB9 Serial Cable, Prolific Chipset, Windows 10/8.1/8/7, Mac OS X 10.6 and Above, 24 inch Length

BENFEI USB to Serial Adapter, Benfei USB to RS-232 Male (9-pin) DB9 Serial Cable, Prolific Chipset, Windows 10/8.1/8/7, Mac OS X 10.6 and Above, 24 inch Length

Product ID: 266714111

Details

Colour
black
Compatible devices
Laptop Modem
Connector type
DB9 USB
Item dimensions L x W x H
10 x 10 x 10
Specific uses for product
PC

🔌1Mbps data transfer speed

🖥️Prolific PL-2303G chipset for max compatibility

🛡️Triple shielding for interference-free connection

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$37.74

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Description

🔗 Connect like a pro — never miss a byte!

COMPACT PORTABLE - Lightweight 24-inch cable designed for on-the-go professionals
ROBUST DATA INTEGRITY - Tinned copper conductor with triple shielding ensures stable 1Mbps transfer
PEACE OF MIND WARRANTY - Exclusive 18-month BENFEI warranty with responsive customer support
UNIVERSAL COMPATIBILITY - Works flawlessly across Windows 11 to XP, Mac OS X 10.6+, and Linux
SEAMLESS SERIAL CONNECTIVITY - Plug & play USB to RS-232 adapter for instant device integration

The BENFEI USB to Serial Adapter features a Prolific PL-2303G chipset delivering reliable 1Mbps data transfer with triple shielding for interference-free performance. Compatible with a wide range of operating systems including Windows 11, Mac OS X 10.6+, and Linux, this 24-inch cable offers plug-and-play convenience and an exclusive 18-month warranty, making it the go-to solution for professionals needing seamless serial device connectivity.

Specifications

ASIN	B0753HBT12
Best Sellers Rank	#142,208 in Computers ( See Top 100 in Computers ) #391 in Serial Adapters
Brand	BENFEI
Color	black
Compatible Devices	Laptop, Modem
Connector Type	DB9, USB
Current Rating	1 Amps
Customer Reviews	4.4 4.4 out of 5 stars (6,199)
Finish	Matte
Input Voltage	12 Volts
Item Dimensions	10 x 10 x 10 millimeters
Item Weight	1 Ounces
Manufacturer	BENFEI
Mfr Part Number	000151black
Model Number	000151
Nominal Power	12 Watts
Number of Items	1
Number of Ports	1
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	PC
UPC	606682478634
Unit Count	1.0 Count
Warranty Type	Limited

Reviews

N**I

問題なく使えました！

11.05.2026

D**G

Detected and installed in seconds, good response, didn't have to driver hunting at all in Windows or Linux versions.

29.01.2025

V**R

Funciona. Que es lo importante. Además viene bien empaquetado con fundas en los cabezales así que muy bien ya que he comprado otro de mayor valor recientemente y es un detalle que no traía.

25.04.2026

Y**T

excellent cable if you are looking for a REAL RS 232 signal to USB convertor

9.03.2026

B**A

Super kabel van goed materiaal en maakt gebruik van de Prolific PL2303GT chip. Werkt goed op Windows 7 tot er met 11!!! Wordt met automatische update voorzien van de juiste driver! Op diverse apparaten getest en werkt uitstekend:)

14.05.2024

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