5m 9-pin Serial Cable Rs232 Wire Harness Db9 Female To Female 9-hole Hole Wire Harness - Wiring Harness - AliExpress
Amazon.com: RS232 DB9 9 Pin Data Serial Cable, Male to Female DB9 Straight Through Extension Cable YOUCHENG for Computers, Printers, Scanners 4.5 Feet : Electronics
All you have to learn about serial connector pinouts