Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
What is a null modem? RS232 null modem pinout and wiring
Null-Modem Serial Cables
New Serial Null Modem Cable Db9f To Db9f Female Db9 Connector Pin 1 To Pin 1 Rs232 To Rs-232 Cross Data Cable - Pc Hardware Cables & Adapters - AliExpress
Serial RS232 Null Modem Cable Female to Female DB9 5ft direct connection cord bx | eBay
What is null modem? Null Modem cable vs Straight serial cable
Null-Modem Serial Cables
RS232 Null-Modem Cable DB09FF -- DataPro
File:D9 Null Modem Wiring.png - Wikimedia Commons
RS232 serial null modem cable wiring and tutorial - Lammert Bies