Tripp Lite 5ft USB to Serial Adapter Cable USB-A to DB9 RS-232 M/M 5' - serial adapter - USB - RS-232 - U209-000-R - USB Adapters - CDW.com
StarTech.com USB to Serial RS232 Adapter Cable with COM Retention 1' - ICUSB232PRO - USB Adapters - CDW.com
Cable: for Protos X bus couplers, 9.8ft/3m cable length (PN# PX-USB-232) | AutomationDirect
Amazon.com: CableCreation USB to RS232 Serial Adapter (FTDI Chip), 6.6 Feet USB to DB9 Female Converter Cable for Windows 10, 8.1, 8, 7, Vista, XP, Linux and Mac OS X, macOS, 2 Meters/Black : Electronics
Amazon.com: UC232A1 (1m) USB to RS-232 Adaptor Cable | ATEN UK | #1 KVM Market Leader,Black : Electronics
USB RS-232 DB9 Male Serial Adapter Converter with Prolific Chip