DB25 to DB25 null modem pin outs

   

To

 

DB25

DB25

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