There are a handful of different communication protocols available on PanelView terminals; tell us which terminal part number you have and how it's hooked up to the SLC-5/04 controller and that will let us help you better.
Based on your description of the system, I would guess what you have is:
PanelView with DH-485 network
1761-NET-AIC module (also known as an "AIC+")
SLC-5/04 Channel 0 configured for DH-485 protocol
The DH-485 trunk connector on the AIC+ cables to the DH485 port on the PanelView. One of RS-232 ports on the AIC+ cables to the SLC-5/04 Channel 0 serial port. Your computer plugs into the other RS-232 port on the AIC+.
If my guesses are correct, you need to use "DH-485" protocol in RSLinx, which means configuring a "1747-PIC/AIC+" driver. This can be tricky depending on your operating system and hardware- you'll want to search the archives on this site or Rockwell's support site if you have trouble with that.
If any of my assumptions are incorrect, then the answer changes too.