eBay
1-5pcs Converter Adapter USB 3.0 20 Pin Male to USB 2.0 9 Pin Motherboard Female Cable USB3.0 Female To 9 Pin USB2.0 Male Cable
Aliexpress UK
Cable is 1.5m long. USB 9 PIN SERIAL CONVERTOR - THE ONE THAT WORKS! A 9 pin USB Serial convertor that actually works! Buy a 9 pin serial USB serial convertor. This plugs into your USB socket and creates a virtual com port allowing you to plug your 9 pin interface into the other end.
eBay
Motherboard Internal USB 2.0 9pin To USB 3.0 20pin Adapter Cable,Mainboard USB 3.0 20 Pin Header To USB 2.0 9 Pin Bridge Cable
Aliexpress UK
✅USB to RS232 DB9 Adapter – Converts USB signals to RS232 for serial devices. 1 ×USB to RS232 Serial DB9 Adapter Cable (length approx. Devices withRS232 DB9 9-Pin Serial Port. Perfect for Windows 7, 8, 10 & 11 (plug and play on most systems). ).
eBay
Serial RS232 9-Pin 23 Crossing Male Female To Female DB9 9-Pin PC Converter Extension Transfer 1-1 Cable Extending Wire
Aliexpress UK
eBay
DB9 Serial Cable 9 Pin RS232 Serial Cable Male To Female PC Converter Extension Cable 9Pin Adapter Cable 1.5m/3m
Aliexpress UK
SKU: 000369 BRAND: NEWLink EAN: 5055383403691 WEIGHT: 0.131.
eBay
1 Pcs DB9 Serial Cable 9 Pin RS232 Serial Cable Male To Female PC Converter Extension 9Pin Adapter Cable 1.5m/3m
Aliexpress UK
1 x CH340G USB 2.0 to 9-pin RS232 COM Port Serial Convert Adapter NEW M66. Support RS232 serial interface (both DB25 and DB9). The USB to Serial/Parallel Adapter provides the connection between USB and the traditional RS-232 serial port.
eBay
USB to RS232 COM Port Serial DB9 Pin Cable Adapter FTDI232 Chipset for Windows 7 8.1 XP Vista Mac OS USB RS232 COM Magnetic Ring
Aliexpress UK
USB to standard 9-pin / DB9 serial port. - Supports RS232 serial interface. - Cable Length: 0.8M (approx.).
eBay
Motherboard USB2.0 9Pin USB HUB 1 To 2 USB 2.0 Connector USB2.0 9 Pin To USB3.0 19Pin Conversion Adapter 9-Pin for RGB Lamp Fan
Aliexpress UK
Plug Type: USB 2.0 to 9 Pin Male RS232. Interface: RS232. The USB to Serial/Parallel Adapter provides the connection between USB and the traditional RS-232 serial port. Since the adapter uses no IRQs, it is perfect if you need many serial devices attached to your PC.
eBay
USB 2.0 to Serial DB-9 RS232 Adapter, Windows 7/8/10/11/32/64/XP/RS232 to USB Converter
Aliexpress UK