1 - Red CH. B TX/RC - 1 top
2 - Black CH. A TX/RC - 2
3 - N.C. - 3
4 - White Signal GND - 4
5 - Blue TX-EN - 5
6 - N.C. - 6
7 - Green Signal GND - 7
8 - Orange +24 vdc - 8 bottom
This is the same for 1747-C10/C11/C20 EXCEPT these cables use Brown +24 vdc on pin 3 and Drain Earth GND on pin 6 as well.