Hitachi L200 Series Service Manual page 16

B–4
Connecting the Inverter to ModBus
OPE / 485 DIP Switch -
The difference between OPE-S and OPE-Smini is the short-circuit inside the connector.
If you set 485-side OPE-S,SRW says "----"(communication error)
But OPE-Smini works properly.
SR 485 TM
SK
OPE PRG