Your PV supports Ethernet protocol. If you have a SLC5/02 it supports DH485 protocol only. You would need at DH485 to Ethernet converter, $$$.
Hopefully you have not connected the PV to the SLC5/02's DH485 port, as it may damage the PV's Ethernet port.
It is not clear that you have a SLC5/02. Can you clarify that?