Fanuc 16O MC Control

I'm currently using Fanuc DNC software to drip feed programs through a fiber optics cable into the HSSB port on the control using and old PC with Windows 2000.

I'm replacing the PC with a Window 10 model and the old Fanuc software is not compatible so I need to use the RS232 Port to drip feed.

I can upload and download programs using the new PC but I'm not able to drip feed any programs in the DNC mode.

It's as if the control is looking for the DNC signal only from the HSSB port.

Is there a physical rotary switch on the control or a parameter that will direct the control to receive data from the RS232 port while in the DNC mode??

The I/O Channel is set to 0. I've tried changing this without any success..