Serial Adapter

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Powers of 10
OBD Gauge
Compass

 
Option 1: build it
 
Male
DB-25		 Male
DB-9
Pin 2 Pin 2
Pin 3 Pin 3
Pin 7 Pin 5
Option 2: buy it
 
bullet Male DB-25 to female DB-9 cable
bullet Null modem
bullet Gender changer

Or use any other combination of cables and adaptors, provided one of them acts as a null modem (swapping Tx and Rx).