Amazon.com: uxcell RS232 DB9 9P Male to Female Head Serial Port Jumper Wire 26cm Long : Industrial & Scientific
5pcs RS232 Male / Female Connect Cable DB9 Serial Port to DuPont 2.54mm 9* 1Pin Data Download Cable jumper Test DB9 Cable 20cm - AliExpress
StarTech.com ICUSB234854I | StarTech.com 4 Port Serial Hub USB to RS232/RS485/RS422 Adapter - Industrial USB 2.0 to DB9 Serial Converter Hub - IP30 Rated - Din Rail Mountable Metal Serial Hub -