RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module: Amazon.com: Industrial & Scientific
Diymore Max3232 Rs232 To Ttl Serial Port Converter Module Db9 Connector Module With Jumper Wire - Integrated Circuits - AliExpress
Rs-232 Jumper Box, Db25 Male To Db25 Female
Amazon.com: BUELEC DB9 Female and Male Connector in One Breakout Board,RS232/RS485/CAN/RS422 with DB9 Connector to Terminal Board Signal Module(2pcsDB9 Female/Male) : Electronics
My Cable Mart - Serial Port DB9 Male RS232 Connector to Terminal Board Module w/Hood
Plastic PCB Jumper Box, DB9 Male / Female - DJB9MF
Plastic PCB Jumper Box, DB9 Male / Female - DJB9MF
Signal integrity can't kill the breakout box
RS232 DB25 Male/Female Jumper Box
DB9-F/DB25-M Serial Port Adapter, Thumbscrew/Thumbscrew– EAGLEG.COM
DB9 female connector DB 9 pin solder RS232 Waterproof O-Ring Panel mount Serial | eBay
DB9 RS232 Serial Splitter Cable, 1 Female / 2 Male
SPCtelco RS232 Interface Adapter / DB25 Adapter, DB25M to DB25F
RS232 click - features a standard RS232 DB9 port and a MAX3232 IC
RS232 DB25 Male/Female Jumper Box
RS232 DB9 9P Male to Female Head Serial Port w Jumper Wire 26cm Long - Walmart.com
D-sub DB9 Breakout Board Connector with Case 9 Pin 2 Row Female RS232 Serial Port Solderless Terminal Block Adapter with Positioning Nuts Connectors - Newegg.com