HD15-Pin VGA Female To DB 9-Pin Male RGB Adapter
The primary purpose of this video legacy display adapter is only for passing the RGB and video sync signal from one end to the other end based upon the pin assignment that this adapter is made. 

Users should look into the pin assignment first for their legacy video equipment before purchase. [Note]: This VGA adapter is not a video converter so it will not cross convert between VGA, CGA or EGA type format.

This VGA adapter is fully molded and protect against unwanted EMI/RFI. It has the 15-pinb VGA end with female connector while the 9-pin end has a male connector.

The 9-pin is for video feed, not for RS232 data use.

D-sub 15-Pin To 9-Pin Hookup
It can be used for passing the VGA signal through a DB 9-pin connector for hookup purpose. 

Example such as connecting a standard VGA signal from graphic card or other VGA equipments to an older NEC or similar  multi-sync RGB monitors built with DB9 connector.

9-Pin To D-sub 15-Pin Hookup
Meanwhile it could also be used for passing the CGA or EGA type RGB signal through a 15-pib VGA connector.

Example such as connecting a 9-pin RGB video output from a console system to a VGA equipment for processing.