normal SC09 cable has two pieces, one of them is longer and it has DB9 (connects to PC) and DB25 (connects to PLC). this part is not just cable, it has rs232/422 converter and it needs 5V to operate properly (received from PLC end).
second piece is just an adapter that converts DB28 into miniDin connector of the FX series PLCs.
both pieces are attached to each other by short string so that adapeter doesn't get lost.