Thanks for clarifying the situation!
Just to step through the checklist for this transfer...
1. Use a straight-through serial cable such as the 2711-NC13.
2. Connect the cable to the RS-232 DF1 Port and not the Printer Port.
3. Ensure there is no DF1 driver running in RSLinx Classic, or anything else using the computer's COM Port.
4. Open the application in PanelBuilder32 and proceed to File>Download.
5. For the Transfer Type select DF1 Point-to-Point -- <your DF1 driver> & OK.
For Step 3, make sure you stop the DF1 driver in RSLinx Classic before attempting to Download from PanelBuilder32, or close RSLinx Classic altogether.
For Step 5, make sure you are selecting the same DF1 driver as the one in RSLinx Classic under which you can see the terminal.
Alternatively, you can select RSLinx Network and browse to the terminal, as has been advised and as you have attempted already.
Step 3 is the most likeliest suspect here, or only unconfirmed Step thus far, and that is why I have highlighted it.
Regards,
George