Appendix - RS-232 (DB9 pins male) hardware back panel connector
Amazon.com: Green-utech 5FT USB Type A to RS-232 9-Pin DB9 Male Serial Adapter Cable for Windows Mac OS Linux FTDI Chipset (5FT, USB Type A to DB9) : Electronics
RS232 DB9 Connector
4XEM DB9 Serial 9-Pin Female To Female Adapter
Sabrent USB 2.0 Type-A Male to RS-232 DB9 Serial 9-Pin SBT-FTDI
DB9 RS-232 Male to Blunt - All 9 Pins - 22 AWG Plenum - Serial Breakou - Custom Cable Connection
What are the Pinouts of the 9 pin D connector for my RS232 or RS422/485 port? - Brainboxes