DB9 to DB9 null modem pin outs

To

DB9

DB9

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