Issue
What is the communication cable needed between the Compact 984 PLC and the Magelis XBTGT or Harmony HMIGTO series HMI families with Dsub9 serial ports?

Product Line
Compact 984 PLC
Magelis XBTGT or XBTGK
Harmony HMIGTO

Resolution
If your Compact 984 PLC has a RJ45 communication port you need to use the XBTZ9711 + XBTZG919.
If your Compact 984 PLC has a DB9 communication port you need to use the XBTZ9710 + XBTZG919 adapter.

The Compact PLC series 258/265/275/285 have a RJ45 comm port. All others Compact have a DB9 comm port.