DB25 to DB9 null modem pin outs

   

To

 

DB25

DB9

 
  2 2  
  3 3  
  4 8  
  5 7  
Pins 6 and 8 must be looped together and then wired to pin 4 6 4  
8  
  7 5  
  20 6 Pins 6 and 1 must be looped together and then wired to pin 20
  1