4 Port USB to DB9 RS232 Serial Adapter - Serial Cards & Adapters, Add-on Cards & Peripherals

StarTech.com Motherboard Serial Port - Internal - 1 Port - Bus Powered - FTDI USB to Serial Adapter - USB to RS232 Adapter - Add an RS232 serial port to any system

USB 2.0 to RS232 Serial Port DB9 9 Pin Male Converter Adapter Win7/8/2000/XP

DIGITUS by ASSMANN Shop USB Type-C™ to serial adapter

This 4 Port USB to RS232 Serial Hub lets you connect up to four RS232 serial devices to your Mac or PC laptop or desktop computer through a single USB

4 Port USB to RS232 Serial DB9 Adapter Hub

Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable

Sabrent 6' USB 2.0 to Serial (9-pin) DB-9 RS-232 Adapter Cable CB-FTDI

StarTech.com 4 Port PCI Express Serial Card w/ Breakout Cable – Natix

Serial Cable to USB Adapter DB9 Male RS232 Port Supports Windows 11 10 8 7 Mac

C2G 5ft USB to DB9 Serial Cable - RS232 Adapter Cable 26887

5ft (1.5m) USB to DB9 Male Serial RS232 Adapter Cable, Adapters and Couplers

Add eight ports supporting three serial protocols, to easily connect serial devices to your computer through USB, with 15kV ESD protection. Add extra COM ports to your laptop or desktop computer, quickly and easily. This USB to RS232/422/485 serial adapter lets you connect to your serial devices through an external USB port.

StarTech.com 8-Port Industrial USB to RS-232/422/485 Serial Adapter

USB-A to Serial Adapter Cable - RS232, DB9, 5-ft.

8 PORT SERIAL CARD: Serial controller card w/ 16C1050 UART based on the Systembase SB16C1058PCI, w/15kV ESD, 8x DB9 ports, bi-directional RS232 speeds

StarTech.com 8-Port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Card - 16C1050 UART - Multiport Serial DB9 Controller/Expansion Card