USB 4-Port Serial Adapter - USB 2.0 to DB-9 Port RS232 with FTDI CHIP - Coolgear
Amazon.com: StarTech.com 8 Port USB to Serial RS232 Adapter - Wall Mount - Din Rail - COM Port Retention - FTDI USB to DB9 RS232 Hub (ICUSB2328I) : Electronics
USB 2.0 A-Male to Dual DB9-Male Serial Adapter - Micro Connectors, Inc.
PRO SIGNAL - USB to 2x 9-pin Serial Adaptor - Male to Male - Walmart.com
Amazon.com: TECHTOO 4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) : Electronics
4-port USB to Serial RS232 Converter
Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux (RS-232\DB9 DTE Male Connector, Prolific PL2303HX Rev. D Chipset) Wireless Adapters - Newegg.com
USB to RS-422/RS-485 DB9 Serial Adapter/Converter Multi-1/USB COMBO – Envistia Mall
Systembase Multi-2/USB to RS-422/485 2-Port DB9 Serial Converter – Envistia Mall
16 Port USB to Serial RS232 Adapter Hub - Serial Cards & Adapters | StarTech.com
USB to serial RS232 adapter with two ports
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Eaton
SystemBase Multi-2U RS232 | USB | Serial
Dual port RS232 Serial to USB adapter for RS232 data conversion.
Industrial 8-Port DB-9 RS232 to USB Adapter Isolation Surge Protection
6ft USB 2.0 Male to 4 x RS232 Serial Port Male DB9 Converter Cable - PI Manufacturing
Gearmo USB 8 Port Serial RS232 featuring FTDI Chipset with LED Indicators
Amazon.com: StarTech.com USB to Serial Adapter - 1 port - USB Powered - FTDI USB UART Chip - DB9 (9-pin) - USB to RS232 Adapter (ICUSB2321F) : Electronics
Digitus USB-Serial Adapter DSUB 9M USB Black | Techinn
Multi-2/USB RS232 - | Serial Adapter | BRESSNER
Amazon.com: DTech USB to Serial Adapter, RS422 RS485 R232 to USB Cable (3 in 1 Interface) Supports DC 5V with Breakout Board LED Lights for Multi-Kind Control Devices Windows 11 10 8
USB-A to Serial Adapter Cable - RS232, DB9, 5-ft. | Eaton