Unless the PanelView Plus is also equipped with a 2711P-RN6 Data Highway Plus card, it cannot communicate over DH+ with the SLC-5/04.
The PanelView Plus can communicate with the SLC-5/04 directly between their serial ports, if that will suit your needs.
The 1761-NET-AIC is a half-duplex RS-232 to RS-485 converter. It's possible that it will work to connect the SLC-5/04 to the PanelView Plus using those, but it's not recommended or tested. It's also possible to reconfigure both the SLC and the PanelView port for DH485 protocol, which is tested but I dislike it.
If you can get a 1761-NET-ENI interface, that will allow you to connect the SLC-5/04 port to an Ethernet network, and that will work with the PanelView Plus on Ethernet.
I personally prefer the increased performance of the Digi One IAP to the 1761-NET-ENI, but the ENI is fine if you respect its limitations.