Eaeon 5-Foot Black Male-to-Male DB9-to-DB9 RS232 Serial Extension Cable Cord.This is a DTE-to-DTE 9 pin DB9 Null Modem cable cord, 9 pin DB9 RS232 serial Crossover cable cord. It features 9 pin DB9 male connectors on both ends for RS232 data communication for PC,Printer,Scanner,Plotter,Barcode,Touchscreen,MCU Board. With 2-Pack Mini Gender Changer Female-to-Female DB9 RS232 Serial Adapter Coupler Connector.