RS232 Board RS232 communication board, SP3232 on board, 3V-5.5V, ESD enhanced, hardware flow control supported
Amazon.com: YIOVVOM Connector DB9 RS232 D-SUB Male Serial Adapter 9-pin Port Adapter to Terminal Connector Signal Module with case(Male Connector, DB9 5+5 with case A) : Electronics
Pmod RS232: Serial Converter and Interface Standard - Digilent
USB-RS232-PCB - FTDI
RS232 to RS485 cable pinout diagram @ pinoutguide.com
RS232 Connectors – vintage bits
rs232 - DB9 male or female Connector in Board - Electrical Engineering Stack Exchange