Amazon.com: DTech DB9 RS232 Serial Cable Female to Female Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication (10 Feet, Black) : Electronics
Null Modem Cable Serial RS232 9 Pin DB9 Male to Female Gender Changer Lead UK | eBay
RS232 Cable to RS-232 DB9F to DB9F Female to Female DB9 Connector Serial Null Modem HDPE Insulation Design UL Standard 0.5m 1.5m - Cakeycn.com
Amazon.com: DTech DB9 RS232 Serial Cable Female to Female Null Modem Cord Cross TX RX line for Data Communication (5 Feet, Black) : Electronics
9 Pin DB9 Female to DB9 Female RS232 Null Modem Cable for NEC Projectors with a D-sub 9 Pin PC Control Port - AliExpress