10 Foot DB9 Female / DB25 Male Null Modem Serial Cable RS232
StarTech.com USB to Serial RS232 Adapter - DB9 Serial DCE Adapter Cable with FTDI – Null Modem - USB 1.1 / 2.0 – Bus-Powered - Walmart.com
Appendix > Standard RS232 Cables
StarTech.com 3m RS232 Serial Null Modem Cable, Crossover Serial Cable w/Al-Mylar Shielding, DB9 Serial COM Port Cable Female to Male, Compatible w/DTE Devices - Tool-Less Design w/Thumbscrews, Black, F/M (9FMNM-3M-RS232-CABLE) - null
Monoprice Db9 Male/male Mini Null Modem Adapter : Target
Null modem - Wikipedia
9 pin Male to Female Null modem adapter (RS232)
RS-232 Null modem cable
Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
Startech .com 1m Black DB9 RS232 Serial Null Modem Cable F/FConnect your serial devices, and transfer your files1m DB9 Null Modem Cable... SCNM9FF1MBK - Corporate Armor
RS232 Null-Modem Cable DB09FF -- DataPro
Should I Use Null Modem or Straight Through Serial Cables? - NI
Amazon.com: StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF) : Electronics
What is the schematic of an RS232 Null-Modem? - Ferguson Wiki
Tripp Lite 18in USB to Null Modem Serial Adapter FTDI w/ COM Retention M/F 18" - serial adapter - USB - RS-232 - U209-18N-NULL - USB Adapters - CDW.com
RS232 serial null modem cable wiring and tutorial - Lammert Bies