StarTech.com 1m Black DB9 RS232 Serial Null Modem Cable F/F - DB9 Female to Female - 9 pin RS232 Null Modem Cable - 1 meter, Black - null modem cable - DB-9 to DB-9 - 3.3 ft
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