This is a bad John Deere 7215R, not working. No wires to some pins
This is the manual connection from original Kess V2 master:
It’s the 2014 year
Here you see how to connect.
the 7r series is non Premium tractors so you must use the pinout on the left Picture.
Where can you buy one adapter for John Deere 9 pin to do your cable?
In Google “John Deere 9 pin cable” or “J1939 female”, many webs can be found there likehttp://www.obdii365.com/wholesale/john-deere-service-advisor-edl-v2-scanner.html
it’s a high-quality one, definitely working fine, tested by professionals.