USB to standard 9-pin / DB9 serial port. - Supports RS232 serial interface. - Cable Length: 0.8M (approx.).
eBay
OTG Cable Adapter 4K 90 Degree Left Angle Powered Micro USB To USB OTG Adapter For TV Tablet Fire TV Stick 4K
Aliexpress UK
Manufacturer Code : 8STICUSB232PRO.
eBay
NNBILI USB 3.1 90 Degree Adapter USB A Male to Female Adapter for PC Laptop USB A Car Charger Power Bank and Most USB Devices
Aliexpress UK
Connectors: With standard USB Type A male to standard 9-pin DB9 RS-232 serial connector. Conductor and Shielding: Tinned copper conductor(wire guage#24#28) and triple shielding ensure the best data transfer rate.
eBay
Micro USB Female To Mini USB Male Adapter Charger Converter Mini USB V3 To Micro USB V8 Adapter for Mobile Phone Android MP3
Aliexpress UK
3Ft Translucent USB 2.0 to DB9 RS232 Serial Converter 9 Pin Adapter Cable PDA. 1 x USB 2.0 to RS232 DB9 Adapter Cable. Smart USB to RS-232 (DB 9-pin male serial port) interface. USB specification 1.1, and USB 2.0 compliant.
eBay
6-IN-1 USB C Docking Station USB 3.0 HUB USB C HUB 4K Type C to HDMI Adapter USB Splitter Adapter OTG For PC Laptop Macbook Pro
Aliexpress UK
Panasonic Plugable USB to Serial Adapter see pics
eBay
7-in-2 USB HUB USB C USB 3.0 HUB 5Gbps Type C Multi Splitter OTG Adapter USB Power Adapter for Laptop Macbook PC Accessories
Aliexpress UK
Features: Brand new and high quality Full compliance with USB2.0 specification.Support RS232 serial interface. Supports automatic handshake-mode.Supports wake-up and intelligent power managements. Provides dual-buffer for upstreams and downstreams data transfer. Strong material ensures strength and durability for long lasting usage. Replaces old/broken/crack/damaged/bad adapter. Specifications: Material:ABS Color:Black Package Includes: 1x USB 3.0 to RS232 9 Pin Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.
eBay
1/2pcs USB C Adapter Type C To USB Adapter for Mobil Phone Male To Female USB C Converter USB Type-C Converter for PC Laptops
Aliexpress UK
Piracy is prevailing everywhere. 1PC 6Pin FTDI FT232RL USB to Serial adapter module USB TO TTL RS232 Arduino Cable. FT232 Cable (Original FT232RL Chip). The cables provide a fast, simple way to connect devices with a TTL level serial interface to USB.
eBay
USB C 3.0 Adapter Type C To USB 2.0 Adapter for Mobil Phone Male To Female USB C Converter USB Type-C Converter for PC Laptops
Aliexpress UK
Tripp Lite USA-19HS Keyspan USB to Serial Adapter - USB-A Male to DB9 RS232 Male 3 ft. (0.91 m) TAA. Tripp Lite USA-19HS Keyspan USB to Serial Adapter - USB-A Male to DB9 RS232 Male 3 ft. (0.91 m) TAA USB Serial RS-232 USB A DB9 Black Taiwan.
eBay
USB 3.2 Digital Display Adapter 10Gbps USB Male TO USB Female Converter Fast Charging Data Transafer USB C Adapter For PC Laptop
Aliexpress UK