Delock Products 87472 Delock Serial Cable RS-232 D-Sub 9 female to female null modem with narrow plug housing - Full Handshaking - 2 m
Dsub Connector, 9 Pin Female - Steinair Inc.
Adapter D-SUB (9-pin)-F/D-SUB (9-pin)-F AK-AD-16
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