The serial gender changer is a simple and quick way to extend a serial cable, change a cable's gender and/or switch between null modem and straight‐through connection. The device requires no external power supply or any user configuration beyond selecting if Tx and Rx lines are crossed.

This universal piece of hardware is an invaluable time saver. Now any serial cable can be used for any hardware application with a quick way to determine null modem / straight‐through type by simply toggling the switch.