Usb To Null Modem (cross Wired) Rs232 Serial Adapter Ftdi Ft232r Usb Rs232 To Db9 Female Adapter Cable Pc Control Tv Cable - Pc Hardware Cables & Adapters - AliExpress
C2G 08075 DB9 Male to DB9 Female Serial RS232 Null Modem Adapter, Beige Data Adapters - Newegg.com
Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
QVS DB9 Female to Female Standard Serial RS232 Null Modem Adapter - Micro Center
Serial Port 9 Pin Null Modem Adapter DB9 Male / Female RS232
DB25 Male to DB25 Female Low Profile Null Modem Adapter - Sealevel