Amazon.com: Oiyagai DB9 Female 9Pin to Screw Terminal Connector Signal Module : Electronics
DB9 Male Header, Transfer Screw, Connection Terminal, 9 Pin, 9 Hole, RS232, RS485 Converter Board – ielectrony
DB9 Female 9-Pin to Terminal Block Adapter
Amazon.com: AAOTOKK DB9 Screw Terminal Block Adapter D-SUB 9-pin RS232 Male to 9+1 Pin/Way Female Serial Terminal Breakout Board Connector Signal Module with case (2Pcak/Male) : Electronics
2744348. - Phoenix Contact - D Sub Connector, Profibus, DB9