4 Port USB to Serial Hub

StarTech.com 4 Port USB to Serial RS232 Adapter - DB9M - RS232 Extension - Serial to USB (ICUSB2324)

UGREEN USB Serial Cable USB to RS232 DB9 9 pin Converter Cable for Connecting Cisco Routers and Switches, Celestron Telescope Nexstar hand Controller, Extron Crestron Products with PL2303 Chipset (1m)

StarTech.com 2 m Black DB9 RS232 Serial Null Modem Cable F/M, DB9 Male to Female, 9 Pin Null Modem Cable, 1x DB9 (M), 1x DB9 (F) - Black