DB9 Male or DB9 Female to 4-pin Cable with XH-2.54mm pin header or PH2.0mm Pin header
you may choose wiring options as below:
Pin1+Pin-2 + Pin-3 + Pin-5
RS232 Serial DCD RXD TXD GND
Note: The pinout wiring option and cable length could be customization. Free sample is available if the order quantity is large.