DB-25 Male to DB-9 Female adapter used to change a serial port from 9 pins to 25 pins to allow a plug in of a 25 pin serial device.

Pinout: 
DB9-F DB25-M
1-8 
2-3 
3-2 
4-20 
5-7 
6-6 
7-4 
8-5 
9-22 
G-G