StarTech.com USB to Serial Adapter - Prolific PL-2303 - COM Port Retention - USB to RS232 Adapter Cable - USB Serial - Add an RS-232 serial port to your laptop or desktop computer through USB; features COM port retention - USB to Serial - USB to RS232 - USB to DB9 - USB to serial Adapter - USB to serial port

Tripp Lite Eaton Tripp Lite Series Compact/Slimline DB9 Gender Changer (M/M) - 1 x DB-9 Male - 1 x DB-9 Male

Tripp Lite By Eaton Eaton Tripp Lite Series Compact/Slimline DB9 Coupler Gender Changer (F/F) - 1 x 9-pin DB-9 Female - 1 x 9-pin DB-9 Female

Tripp Lite Eaton Tripp Lite Series Compact/Slimline DB9 Coupler Gender Changer (F/F) - 1 x 9-pin DB-9 Female - 1 x 9-pin DB-9 Female

Tripp Lite By Eaton Eaton Tripp Lite Series Compact/Slimline DB9 Gender Changer (M/M) - 1 x DB-9 Male - 1 x DB-9 Male

StarTech.com DB9 to RJ45 Modular Serial Adapter - Black - Convert your DB9 male connector into an RJ45 female connector

StarTech.com 8.3ft (2.5m) 1-Port FTDI USB to Serial RS232 Adapter Cable with Optical Isolation, USB to RS232 Adapter - TAA - USB to serial RS232 adapter - Integrated 2500Vrms Optical Isolation Circuits - Small form factor, serial RS232 USB powered - COM port retention - 8.3ft (2.4m); FTDI FT232RL Chipset; 500W Bi-directional circuits Surge Protection; TAA

StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232, USB to RS232 Adapter, Prolific Chipset - M/M - USB to serial RS232 adapter; USB Powered; Prolific Chipset - Converts a USB port into an RS232 DB9 serial port - Windows, Mac or Linux; Works with your USB 1.0 or 2.0 ports - Baud Rate up to 921.6Kbps - USB to RS232 serial has a lightweight design