this the first one prepare connecter RS-232C female 1 set and male 1 set ,shielding cable about 2-3 meter
-Use the shielding cable about 2-3 meter
-Connect Pin number 2 Female and Pin 2 Male together
-Connect Pin number 3 Female and Pin 3 Male together
-Connect Pin number 5 Female and Pin 9 Male together
-Connect Pin 7 and 8 of Female together
-Connect Pin 4 and 6 of Female together
-Connect Pin 4 and 5 of Male together
From my experience we can make longer more than 5 meter but
the quality of communication is not good I hope this articals can help everybody for do the cable link communication with all PLC Omron