comms between a EN2SE and a SLC 5/03 db9
Will a 1747-CP3 cable work?
cp3 pinout: https://literature.rockwellautomation.com/idc/groups/literature/documents/in/1747-in518_-en-p.pdf
So the basic issue i see, is that it is a female connector. You will need a gender changer.
Also PIN 1 is reserved for 5 volts. You might need to alter the cable to allow the 5V to pass through PIN 1.